165results about How to "Increase the output frequency" patented technology

The invention relates to a transcranial magnetic field stimulator with a plurality of stimulating coils which comprises a high voltage charging power supply, a current-limiting resistance, an energy dumped capacitor, a reverse current reflowing diode, a thyristor switch, stimulating coils and a microcomputer controller. The stimulator is characterized in that: a stimulating unit comprises a thyristor switch, a stimulating coil and an energy dumped capacitor; N parallel connected stimulating units are connected to the current-limiting resistance and the high voltage charging power supply end; N stimulating units shared use an energy dumped capacitor; the microcomputer controller ends are respectively connected with the triggering ends of the thyristor switch in every stimulating unit; N is more than or equal to 2. A magnetic field stimulator of the invention can substitute a plurality of magnetic field stimulators in using, realizes the in-turn stimulation of a plurality of stimulating coils, and ensures a plurality of parts to get continuous stimulation from the program control. If the number of the energy dumped capacitor is increased, a plurality of coils not only can be stimulated in time sharing, but also achieving synchronous stimulation and couple stimulation.

The invention discloses a tera-hertz silica-based quadrupler and a frequency multiplier, belonging to the field of RFIC (Radio Frequency Integrated Circuit). The quadrupler comprises transistors (M1 and M2) and transmission lines (L1, L2 and L-1), wherein the drain ends of the transistors (M1 and M2) are respectively connected to an output port through the transmission lines (L1 and L2), source ends are connected with a ground line, grid ends are respectively connected with the signal input ends of an path (I) and the path (Q) of a baseband signal (f0); the transmission line (L-1) is connected between the output port and a power supply; and the length of the transmission lines (L1 and L2) are 1 / 4 of that of the corresponding wavelength of a signal (2f0), the length of the transmission line (L-1) is 1 / 4 of that of the corresponding wavelength of a signal (4f0). The multi-frequency multiplier comprises a 2n frequency multiplier (1), a 2n frequency multiplier (2) and a transmission line (L), wherein the output ports of the 2n frequency multiplier (1) and the 2n frequency multiplier (2) are connected to be used as the output port of a 2n+1 frequency multiplier, the transmission line (L) is connected between the output port of the 2n+1 frequency multiplier and the power supply, and the length of the transmission line (L) is 1 / 4 of that of the corresponding wavelength of a signal (2n+1f0). The tera-hertz silica-based quadrupler and the multi-frequency multiplier, provided by invention, have the advantages of high output frequency, pure frequency spectrum, low power consumption and easiness for integration.

The invention provides a rotary-type compound nanometer power generator. The rotary-type compound nanometer power generator comprises a friction nanometer power generation assembly and a magnetic-electric sensing power generation assembly, wherein the friction nanometer power generation assembly comprises a rotor and a stator which are provided with a command rotation shaft, a friction layer is arranged on the lower surface of the rotor and is formed by outwards and radially arranging a plurality of friction units taking the rotation shaft as a circle center, an electrode layer of the stator comprises a first electrode and a second electrode which are formed by outwards and radially arranging a plurality of first electrode units and a plurality of second electrode units at intervals in the same plane from the rotation shaft, electron gain-loss capability difference exists between the friction units and the upper surface material of the stator, a magnet part and a coil part of the magnetic-electric sensing power generation assembly are separately arranged on the rotor and the stator, and under the effect of an external force, induction potential difference is generated between the two electrodes, and meanwhile, induction current is generated in the coil part. The power generator provided by the invention can acquire current output with milliamperes and can be used for directly supplying power to a small-sized power utilization device.

The invention discloses a method for detecting braking property of a vehicle in a road test based on improved Kalman filtering, which comprises the following steps: on the basis of referring a 'current' statistical model of an engine driven carrier in the navigation field, establishing a system motion model in the vehicle braking process; according to the Kalman filtering theory, using a speed and an azimuth angle outputted by a single-frequency carrier phase single-point GPS (global position system) receiver as the system observed volumes; and high frequently and precisely calculating a plane motion coordinate and the speed in the vehicle braking process, by utilizing the improved Kalman filtering recursive algorithm, thereby calculating and confirming a vehicle braking distance and a mean fully developed deceleration MFDD.

The invention discloses a vibration switch type friction generator and a friction generating method. The friction generator comprises a first friction layer whose upper surface is contacted and provided with a first electrode layer, a second friction layer whose lower surface is contacted and provided with a second electrode layer, and a vibration type switch. The vibration type switch enables the two electrode layers to alternate and form electrical communication with an equipotential source. The vibration of the vibration switch is triggered by the mechanical motion of a generator. During a periodically contacting / separating process of the two friction layers, equipotential electric potential is generated on the two electrode layers, and when the two electrode layers alternately communicate with the equipotential source through the vibration switch, alternate currents are generated. Since the frequency of currents outputted by the generator is decided by the frequency of the vibration switch, the output frequency of the generator can be improved by improving the vibration frequency of the vibration switch.

A method and arrangement for soft start up of a pump system, that includes a pump (401) for generating a liquid flow, an electrical drive (402, 403, 404) disposed to actuate the pump, and a pressure sensor (408) disposed to measure a liquid pressure at a flow output of the pump. The objectives of the invention are achieved with a solution in which a rate of change of rotation speed of the pump during a start up phase is made to be dependent on a rate of change of measured liquid pressure speed is a descending function of the rate of change of the measured liquid pressure.

A gas turbine generating apparatus according to the present invention comprises a gas turbine capable of a high-speed operation, a permanent-magnet-type generator driven at a high speed by the gas turbine, an inverter device (5) for converting alternating-current power generated by the generator into commercial alternating-current power, and a system-interconnection device (9) for interconnecting output of the inverter device to a commercial AC power supply system (10). The system-interconnection device controls the inverter device based on voltage of the commercial AC power supply system as a criterion such that output current of the inverter device is in phase with the voltage or out of phase with the voltage by a constant phase difference. A control device (18) is provided for operating the permanent-magnet-type generator (4) as a motor at a time of starting the gas turbine, and supplying alternating-current power from a direct-current power supply through the inverter device or another inverter device in addition to the inverter device to the generator for increasing a rotational speed smoothly from zero. The control device detects output current of the inverter device and controls the inverter device to keep the output current constant.

The invention discloses a vibration exciter based on piezoelectric stack. The vibration exciter comprises a piezoelectric stack driver, a vibrating mechanism and a packaging structure, wherein the piezoelectric stack driver is fixedly arranged in the packaging structure, and an outside input signal is input to the piezoelectric stack driver through a connecting wire penetrating through the packaging structure to drive the piezoelectric stack in the piezoelectric stack driver to vibrate. According to the technical scheme, the piezoelectric stack is adopted by the driver, the driving force of the piezoelectric stack is large, the output displacement of the piezoelectric stack is low, and the maximum output frequency of the piezoelectric stack is larger than 15 KHz. When loaded by sine alternating voltage, the piezoelectric stack can periodically vibrate along with the changes of the voltage, infinitesimal axial displacement is produced, and electric energy is converted into mechanical energy to be output. According to the vibration exciter, the components are simple, the number of the components is small, space needed by the design is saved, the structure is very compact, machining and assembling are easy, and the vibration exciter has the advantages of being high in output frequency, small in vibration displacement and size and easy to assemble. The vibration exciter is suitable for a high-precision driving, high-frequency-spectrum resonance driving and high-precision detecting system.

The invention provides a dual-mode voltage-controlled oscillator (DMVCO), a frequency synthesizer and a wireless receiving device, and pertains to the technical field of integrated circuit of radio frequency wireless receiver. The DMVCO and the frequency synthesizer can operate in a wideband mode and a quadrature mode. When operating in the quadrature mode, a quadrature signal is provided for a Single Sideband Mixer of the frequency synthesizer by a quadrature coupling of a first voltage-controlled oscillator unit and a second voltage-controlled oscillator unit in the DMVCO in the overlapped frequency band so that the frequency synthesizer can cover a higher output frequency band. Therefore, the tuning range of the DMVCO of the invention is wide, and the frequency synthesizer using the DMVCO is low in power consumption, simple in structure and has good frequency spur performance.

The invention, which relates to the technical field of the unmanned aerial vehicle, discloses a positioning method and apparatus and an unmanned aerial vehicle. The positioning method applied to a mobile station comprises: receiving differential data sent by a base station; collecting original navigation telegraph text data and inertial navigation data; and carrying out fusion on the differential data, the original navigation telegraph text data and the inertial navigation data to obtain current position information of the mobile station. The differential data and the original navigation telegraph text data are obtained by a Beidou navigation system. According to the invention, the method, apparatus, and equipment are suitable for a high-dynamic positioning environment; and while the positioning precision is guaranteed, the price can be lowered to a certain extent.

The present invention discloses a differential push-push voltage controlled oscillator and signal generation device, comprising a quadrature oscillator, two harmonic selection elements, two frequency multiplier circuits and a power combination element. The quadrature oscillator generates two orthogonal signals and respective harmonic signals, two harmonic selection elements are used for extracting secondary harmonics in two output signals of the oscillator, generating the output of a differential push-push signal; two frequency multiplier circuits are used for frequency multiplication of the signal, generating two frequency multiplier signals with the same phase; the power combination element achieves the combination of power of two signals with the same phase, forming the output of a single-end signal source. The signal source achieves the output of a differential push-push voltage controlled oscillator by a harmonic extraction and frequency multiplication manner, increases the output frequency of signals and utilizes two orthogonal oscillation signals in connection with a power combination manner to increase the output power of signals.

The invention belongs to the area of the frequency conversion. The values of the voltagle and the current at the DC loop or the output end of the frequency converter are detected by the detect unit so as to determine whether the electric machine is in the electromotion state or in the dynamoelectric state. Thus, the output frequency of the converter can be adjusted accordingly to change the speed of the electric machine in order to reduce and eliminate the consumption of the electrical energy on the braking resistor. The speed of the electric machine can be adjusted by increasing or decreasing the output frequency of the converter making the average speed of the cooking fume exhauster run at expected speed. The invention possesses the good effect of saving energy.

The invention provides a self-driven switching type frictional nanometer generator. The generator comprises a friction generating unit and a voltage driven switch, wherein the friction generating unit comprises at least one pair of corresponding frictional layers used for generating opposite triboelectric charges through physical contact and electrodes which are mutually insulated and make contact with the two frictional layers; one electrode of the friction generating unit is connected with the voltage driven switch to serve as an output end of the frictional nanometer generator, and the other electrode of the friction generating unit serves as the other output end of the frictional nanometer generator. Closing and opening of the voltage driven switch are driven by the friction generating unit, electrical output characteristics of the frictional nanometer generator can be regulated and controlled, and the application range of the frictional nanometer generator is extended.

The invention provides a successive approximation register analog-to-digital converter based on voltage-controlled oscillator quantization, and belongs to the technical field of analog integrated circuits. The successive approximation register analog-to-digital converter comprises a clock multiplier module, a sampling and holding circuit, a quantizer based on a voltage-controlled oscillator, a successive approximation register, and a digital-to-analog conversion circuit. The quantizer based on a voltage-controlled oscillator comprises a differential input voltage-controlled oscillator and a counter. The differential input voltage-controlled oscillator has positive and negative input ends and an output end, the positive input end is connected with a sampling signal, the negative input end is connected with a comparison reference signal, and the output end is connected with the counter. High and low logic levels quantified by the counter are transferred to the successive approximation register. The defect that a successive approximation register analog-to-digital converter of a traditional structure has high resolution but low sampling rate is overcome. High-speed quantization can be realized. The system bandwidth of the analog-to-digital converter can be increased. High-resolution quantization can be realized at a sampling frequency. The successive approximation register analog-to-digital converter can be used in high-speed and high-precision analog-to-digital conversion.

The invention provides a positioning method and device based on inertial navigation and satellite navigation. The method includes the steps: (1) calculating a first included angle, horizontal axis translation amount and vertical axis translation amount; (2) constructing a system state matrix by the aid of estimation values of a coordinate and a course angle of a user under a horizontal free azimuth coordinate system, constructing a system parameter matrix by the aid of the step length and the estimation values of the course angle of the user under the horizontal free azimuth coordinate system,constructing a measurement value matrix by the aid of a first coordinate and a first course angle, constructing a state equation and a measurement equation of an extended Kalman filter, and calculating an estimation value of a user coordinate by an extended Kalman filter method. According to the positioning method, the satellite navigation and micro-inertial navigation are combined, high-accuracypositioning under long-time complex scenes is achieved by the aid of the advantages of satellite navigation and inertial navigation, satellite navigation has the advantages that the accuracy is high,and errors are stable and cannot be accumulated along with time, inertial navigation has the advantages of high short-term accuracy, and indoor accurate positioning and outdoor accurate positioning can be seamlessly connected.

The invention relates to a laser radar system and a laser scanning control method. The laser radar system can comprise a laser emission module, a double-refracting prism, a galvanometer and a laser reception module, wherein the laser emission module is used for emitting a laser beam; the double-refracting prism is used for separating the laser beam into first laser and second laser emitted towardthe galvanometer; an included angle exists between the first laser and the second laser; the galvanometer is used for reflecting the first laser and the second laser to different positions of a detection area; the laser reception module is used for respectively receiving a first echo light beam and a second echo light beam reflected back from the detection area; the first echo light beam is laser,reflected back by an object in the detection area, of the first laser; and the second echo light beam is laser, reflected back by the object in the detection area, of the second laser. By adoption ofthe laser radar system, the scanning field angle can be improved.

Provided is a stator winder. The stator winder comprises a rack, a clamp station, a workbench and a controlling station. The clamp station is provided with a stator clamp seat, a stator fixing device, a wire clamping or wire breaking device. The workbench is provided with a wire feeding device, a wire winding device, an X-axis moving device capable of doing left and right reciprocating motion, a Y-axis moving device capable of doing forward and backward reciprocating motion and a Z-axis moving device capable of doing upward and downward reciprocating motion. A Z-axis servo motor drives a cam crank connecting rod mechanism to move, and drives a Z-axis planker to carry out the upward and downward reciprocating motion. The workbench is adjacent to the clamp station. Swing arms of the wire winding device are in the shape of the capital 'pi'. Wire winding needles are vertically arranged on the sides of front arms of the swing arms. The front arms of the swing arms and the wire winding needles can stretch into or moving apart from the hollow portion and the upper portion of a stator body on the stator clamp seat to conduct the wire winding process. According to the stator winder, the mechanical, fully automatic, high speed and accurate varnished wire winding process can be conducted on the stator body of a novel fan motor, so that the manual operation or intervention is not needed during the whole wire winding process.

The invention discloses a high-power dimming electrodeless lamp. The high-power dimming electrodeless lamp comprises an anti-electromagnetic interference filter, a bridge rectifier module, an active power factor corrector, a half-bridge inverter oscillatory circuit, a power output device, a starting controller, a high-frequency coupler, a dimming circuit and an HB0809 integrated circuit, wherein the half-bridge inverter oscillatory circuit is used for converting a direct current voltage into a high-frequency alternating voltage; the power output device is used for supplying output power to the half-bridge inverter oscillatory circuit when the half-bridge inverter oscillatory circuit works; the starting controller is used for controlling the turning on and turning off of the electrodeless lamp; the high-frequency coupler is used for coupling electric energy of the active power factor corrector and the power output device to the lamp tube of the electrodeless lamp; the dimming circuit is connected with an externally connected dimming control circuit; when the externally connected dimming control circuit supplies a 0 to 10-volt direct current (VDC) dimming control voltage signal to the dimming circuit, the dimming circuit works and then converts the alternating voltage into a 18-volt direct voltage; and the HB0809 integrated circuit is connected to the half-bridge inverter oscillatory circuit and used for controlling the alternately turning on and turning off of a first metal oxide semiconductor (MOS) tube and a second MOS tube in the half-bridge inverter oscillatory circuit to set working frequency, ignition time and ignition frequency. By a dimming electrodeless lamp circuit, a dimming function of the high-power electrodeless lamp can be realized.

The invention provides a dual-mode voltage-controlled oscillator (DMVCO), a frequency synthesizer and a wireless receiving device, and pertains to the technical field of integrated circuit of radio frequency wireless receiver. The DMVCO and the frequency synthesizer can operate in a wideband mode and a quadrature mode. When operating in the quadrature mode, a quadrature signal is provided for a Single Sideband Mixer of the frequency synthesizer by a quadrature coupling of a first voltage-controlled oscillator unit and a second voltage-controlled oscillator unit in the DMVCO in the overlapped frequency band so that the frequency synthesizer can cover a higher output frequency band. Therefore, the tuning range of the DMVCO of the invention is wide, and the frequency synthesizer using the DMVCO is low in power consumption, simple in structure and has good frequency spur performance.

The invention discloses a magnetoelectric encoder with an end auxiliary stator coil. The auxiliary stator coil is cut by a magnetic field when multi-antipode magnetic steel rotates to generate voltage, the rotating speed of the current encoder is judged by reading a voltage peak value, and the rotating speed direction of the current encoder is obtained by an angle value signal differential value obtained by multi-antipode Hall calculation. The magnetoelectric encoder comprises an encoder structure, an auxiliary stator coil structure and a side shaft. The side shaft rotates, the multi-antipodemagnetic steel is driven to rotate to cut the auxiliary stator coil in a magnetic field, the voltage is generated, the higher the rotating speed of the rotor is, the higher the amplitude of the sine voltage obtained in the winding coil is, the voltage amplitude and the rotating speed are in a linear proportional relation, the rotating speed of the current encoder is judged by reading a voltage peak value, and the rotating speed direction of the current encoder is obtained through an angle value signal differential value obtained through multi-antipode Hall calculation.

The invention discloses an unmanned aerial vehicle location method, device and system based on ultra wideband as well as a computer readable storage medium. The method comprises the following steps: acquiring a corresponding original measured distance value of each base station and a tag output by UWB equipment; performing calibration processing on each original measured distance value according to a preset calibration method, so that actual distance values in one-to-one correspondence with all the original measured distance values are obtained; and processing each corresponding actual distance value of the tag and each base station by adopting an extended Kalman filter method, so that location information of the tag is obtained. The method disclosed by the invention performs calibration on each acquired original measured distance value, a more accurate distance value can be obtained, each corresponding actual distance value of the tag and each base station is processed by adopting theextended Kalman filter method, compared with a method in the prior art, tag location precision can be improved, and an output frequency is high and antijamming capability is strong, so that locationon a tag moving at a high speed can be beneficially realized.

The invention discloses a broadband fine-step frequency synthesis circuit and method, and relates to the technical field of frequency synthesis, and the broadband fine-step frequency synthesis circuit comprises a reference unit, an intermediate frequency unit, a local oscillator unit and a spread spectrum unit. The reference unit generates low-noise reference signals, and the output end is connected with the signal input end of the intermediate frequency unit and the signal input end of the local oscillator unit. The intermediate frequency unit generates fine-stepping broadband intermediate frequency signals, and the output end of the intermediate frequency unit is connected with the signal input end of the spread spectrum unit. The local oscillator unit generates low-phase noise local oscillator signals, and the output end of the local oscillator unit is connected with the signal input end of the spread spectrum unit. The local oscillator signals and the intermediate frequency signals are mixed in the spread spectrum unit, and the output of the spread spectrum unit is the output of the frequency synthesis circuit. According to the invention, comb line cascade connection and direct combination are adopted to realize low-phase noise local oscillation; a DDS + phase-locked loop is adopted to realize fine stepping broadband intermediate frequency; the working bandwidth is efficiently expanded by means of frequency mixing shift, interpolation filling, frequency band splicing and the like, and cross-octave broadband fine-step frequency synthesis is realized.

An embodiment of the invention provides an inertial sensor and visual sensor data fusion algorithm. With the adoption of the provided inertial sensor and visual sensor data fusion positioning method,positioning information is determined according to first positioning data, acquired by an inertial sensor, of a positioning point and second positioning data, acquired by a visual sensor, of the positioning point, or the positioning information is determined according to the first positioning data when the second positioning data acquired by the visual sensor are not acquired, so that the positioning information is not required to be always determined according to the second positioning data acquired by the visual sensor when two-dimensional space coordinates and / or three-dimensional space coordinates are determined, the positioning information can be still output when the frequency of the visual sensor is lower or the accurate positioning data cannot be determined according to acquired images, the output frequency of the positioning information is improved and positioning delay is reduced.

The invention relates to a vehicle positioning method and system based on dual-antenna GNSS heading and wheel speed assistance. The method includes steps: 1) in a vehicle stationary condition, calculating initial values of position and heading according to positions and headings of GNSS antennas, and obtaining initial values of the position and the heading of a vehicle; 2) estimating the heading of the vehicle according to the initial values of the position and the heading and an angular velocity measured by inertial navigation, and calculating the position corresponding to the heading; 3) calculating an inertial navigation position and an inertial navigation heading according to a rotating speed of a motor and the calculated position corresponding to the heading, and correcting the position and the heading by employing an adaptive Kalman filtering algorithm; and 4) inputting the corrected position and heading to step 2), repeating the above steps, and outputting the final heading andposition to further obtain vehicle positioning information. Compared with the prior art, according to the method and system, vehicle information sources are fully used, the problem of low precision of the output speed of a GNSS receiver at a low speed is solved, and the method and system is advantaged by easy debugging, high estimation precision and small calculation amount.

The invention discloses a VCO circuit with low power and high performance. The VCO circuit comprises a band-gap reference circuit, a low dropout voltage linear voltage-stabilizing circuit, a current converter circuit, and an annular oscillator circuit which are orderly connected from left to right; the band-gap reference circuit is used for providing a reference voltage which cannot change along with the temperature and a power voltage; the low dropout voltage linear voltage-stabilizing LDO is used for doubling the band-gap reference produced voltage and maintaining the output voltage unchanged; the current converter circuit comprises three layers of conversion devices; the annular oscillator circuit is composed of five stages of oscillators in parallel; the VCO circuit disclosed by the invention is high in output frequency, small in change along the process and large in frequency adjustable range under low voltage; an output frequency of a voltage-controlled oscillator is small in change along the temperature, the chip cost is low, the circuit structure is simple, and the power consumption is low.

The invention discloses a terahertz frequency synthesizer realized by adopting a CMOS process, which comprises a voltage controlled oscillator generating terahertz LO signals, a first-stage injection-locked frequency divider and a second-stage injection-locked frequency divider for frequency division, and a phase-locked loop for locking a reached set frequency, wherein the voltage controlled oscillator, the first-stage injection-locked frequency divider, the second-stage injection-locked frequency divider and the phase-locked loop are in serial connection sequentially; and the feedback output end of the phase-locked loop is connected with the feedback input end of the voltage controlled oscillator. According to the terahertz frequency synthesizer realized by adopting the CMOS process disclosed by the invention, the standard CMOS process is adopted for realization, the integration is high, the cost is low, mass production is facilitated, the limitation of poor working performance near a cutoff frequency of the CMOS process is overcome, and the design of the terahertz frequency synthesizer is realized.

The invention relates to a conductive probe liquid holdup gauge, which comprises a signal generator, a probe and a signal processor, wherein a high-frequency sine wave signal is outputted by a signal generating integrated circuit in the signal generator and a high-frequency signal is supplied to the probe after the power of the high-frequency sine wave signal is amplified by an audio power amplifier; the signal processor is serially connected in a loop formed by the signal generator and the probe; a detected high-frequency alternating-current current signal is transmitted into the signal processor by the probe; the alternating-current current signal is converted into an alternating-current voltage signal in direct proportion by a high-speed operation amplifier in the signal processor; and the alternating-current voltage signal is converted into a direct-current voltage signal having the same effective value with the alternating-current voltage signal by an alternating-current valtoge to direct-current effective value converter in the signal processor, and then the direct-current voltage signal is transmitted to a data acquisition card for being collected and analyzed. By using the conductive probe liquid holdup gauge, the interference of the probe capacitive reactance component can be restrained and the precision of measuring stability of liquid holdup can be increased. The conductive probe liquid holdup gauge can be widely applied to the gas-liquid ratio measurement in two-phase flow pipeline.

The invention discloses a terahertz two-stage cascade balanced type nonuple frequency multiplier circuit, which relates to the technical field of terahertz circuits. The terahertz two-stage cascade balanced type nonuple frequency multiplier circuit comprises an input waveguide, a cavity, a nonuple frequency multiplication circuit chip and an output waveguide, wherein a terahertz diode in the circuit is manufactured by adopting a GaAs process. The terahertz two-stage cascade balanced type nonuple frequency multiplier circuit comprises a two-stage terahertz balanced diode frequency tripler, andcan realize a nonuple frequency multiplication function. Only one diode is arranged on the single side of each stage of frequency tripler circuit, so that the cut-off frequency of each stage of frequency doubling tube is improved, and higher output frequency doubling loss can be obtained. Each stage of frequency tripler circuit adopts an odd harmonic balance type structure, so that the terahertz two-stage cascade balanced type nonuple frequency multiplier circuit has good symmetry, even-order harmonics can be better inhibited, the power on the diode is reduced, the heat dissipation of the diode is facilitated, and direct current bias can be more conveniently introduced.

An object of the present invention provides a frequency synthesizer having a broad frequency entraining range which can finely set a frequency over a broad band by a novel principle.As s specific solving means, a sinusoidal signal of an output frequency of a voltage-controlled oscillator is subjected to orthogonal detection, a vector rotating at the differential frequency (speed) between the output frequency and the frequency of the frequency signal used for the detection is created, and the frequency of a vector when the output frequency of the voltage-controlled oscillator is equal to a set value is calculated in advance. The voltage signal corresponding to the difference between the frequency of the vector and the calculated frequency is fed back to the voltage-controlled oscillator when the voltage-controlled oscillator is driven, and PLL is formed so that the difference is equal to zero. Accordingly, the output frequency of the voltage-controlled oscillator is adjusted to the set frequency when PLL is locked. After the difference between both the frequencies is increased after PLL is locked, the set value is integrated by the integrating circuit portion and added to the control voltage.