53results about How to "High input resistance" patented technology

A space efficient multi-feed antenna apparatus, and methods for use in a radio frequency communications device. In one embodiment, the antenna assembly comprises three (3) separate radiator structures disposed on a common antenna carrier. Each of the three antenna radiators is connected to separate feed ports of a radio frequency front end. In one variant, the first and the third radiators comprise quarter-wavelength planar inverted-L antennas (PILA), while the second radiator comprises a half-wavelength grounded loop-type antenna disposed in between the first and the third radiators. The PILA radiators are characterized by radiation patterns having maximum radiation axes that are substantially perpendicular to the antenna plane. The loop radiator is characterized by radiation pattern having axis of maximum radiation that is parallel to the antenna plane. The above configuration of radiating patterns advantageously isolates the first radiator structure from the third radiator structure in at least one frequency band.

Disclosed is an ISFET comprising a H+-sensing membrane consisting of RF-sputtering a-WO3. The a-WO3 / SiO2-gate ISFET of the present invention is very sensitive in aqueous solution, and particularly in acidic aqueous solution. The sensitivity of the present ISFET ranges from 50 to 58 mV / pH. In addition, the disclosed ISFET has high linearity. Accordingly, the disclosed ISFET can be used to detect effluent.

Disclosed is an ISFET comprising a H+-sensing membrane consisting of RF-sputtering a-WO3. The a-WO3 / SiO2-gate ISFET of the present invention is very sensitive in aqueous solution, and particularly in acidic aqueous solution. The sensitivity of the present ISFET ranges from 50 to 58 mV / pH. In addition, the disclosed ISFET has high linearity. Accordingly, the disclosed ISFET can be used to detect effluent.

A space efficient multi-feed antenna apparatus, and methods for use in a radio frequency communications device. In one embodiment, the antenna assembly comprises three (3) separate radiator structures disposed on a common antenna carrier. Each of the three antenna radiators is connected to separate feed ports of a radio frequency front end. In one variant, the first and the third radiators comprise quarter-wavelength planar inverted-L antennas (PILA), while the second radiator comprises a half-wavelength grounded loop-type antenna disposed in between the first and the third radiators. The PILA radiators are characterized by radiation patterns having maximum radiation axes that are substantially perpendicular to the antenna plane. The loop radiator is characterized by radiation pattern having axis of maximum radiation that is parallel to the antenna plane. The above configuration of radiating patterns advantageously isolates the first radiator structure from the third radiator structure in at least one frequency band.

The system described herein relates to a particle beam apparatus for analyzing and / or for processing an object and to a method for operating a particle beam apparatus. The particle beam apparatus is designed for example as an electron beam apparatus and / or an ion beam apparatus. The particle beam apparatus comprises a beam deflection device, for example an objective lens, which is provided with a first coil and a second coil. The first coil is operated with a first coil current. The second coil is operated with a second coil current. The first coil current and / or the second coil current may always be controlled in such a way that the sum of the first coil current and the second coil current (the summation current) or the difference between the first coil current and the second coil current (the difference current) is controlled to a setpoint value.

The invention discloses a gain bootstrap operational amplifier, which includes a differential circuit and a common-source common-grid bootstrap circuit. The common-source common-grid bootstrap circuit includes an assistant operational amplifier Ap and an assistant operational amplifier An. The assistant operational amplifier Ap is of an gain bootstrap operational amplifier of which the differential circuit consists of a N channel junction field effect transistor, an assistant operational amplifier An is of a gain bootstrap operational amplifier of which the differential circuit consists of a P channel junction field effect transistor. The invention obtains the gain bootstrap operational amplifier with high gain by adopting the structure nesting a plurality of grades of gain bootstrap operational amplifiers, has larger bandwidth and larger input resistance, and greatly improves the performance of the gain bootstrap operational amplifier.

A high-frequency switch circuit includes: a switch section comprised of a field effect transistor having a plurality of bias circuits and a potential generating circuit for generating bias voltages from a control signal and supplying them to the bias circuits. The field effect transistor forms the passage route of a high-frequency signal by turning on and off in accordance with the control signal. The bias circuits are provided to produce a potential difference between the drain terminal and the source terminal of the field effect transistor and to apply bias voltages lower than the voltage of the control signal to the drain terminal, and the source terminal.

The invention discloses a common-mode level reset circuit for differential signals. The common-mode level reset circuit comprises a source follow circuit, a voltage-current conversion circuit, a current output circuit and a common-mode reset circuit, wherein the source follow circuit, the voltage-current conversion circuit, the current output circuit and the common-mode reset circuit are sequentially connected. The common-mode level reset circuit can achieve level resetting of output common-mode points, meet the requirement of the next stage input common-mode points, and maintain high differential linearity. The source follow device circuit of a PMOS tube enables the VTH of the input common-mode points to be increased, and the input common-mode points are connected with an NMOS of a following form to form the voltage-current conversion circuit, the input voltage linearity is converted into the current signals, the current signals are transmitted to the current output circuit through image currents, the common-mode level of the current output circuit is reset through the common-mode reset circuit, and finally the common-mode level of the output level VOUT and the VREF are identical. The common-mode level reset circuit achieves resetting of the differential signal common-mode level, maintains the differential linearity of the signals to the maximum degree, and is suitable for the differential signals with the medium amplitude.

The invention discloses a three-phase thyristor phase-shift trigger pulse control circuit which is in modularity design. The circuit includes a given control module (1), a startup linkage control module (2), a synchronizing adjusting module (3), a pulse shaping and control module (4) and a pulse power amplifying module (5). The three-phase thyristor phase-shift trigger pulse control circuit of the invention replaces the original old circuit to realize the purpose that the control is much safe, the point impact can be avoided at any situation, the circuit is much simple, the part is easy to purchase and the service life is much long.

Disclosed is a filter circuit assembly that includes a filter stage with a variable resistor and a resistor / capacitor (RC) oscillator. A controlling output of the RC oscillator controls the value of the variable resistor. The RC oscillator itself also includes a variable resistor. The controlling output of the RC oscillator also controls the value of the variable resistor of the RC oscillator. The structure of the variable resistor of the filter stage is substantially the same as the structure of the variable resistor of the RC oscillator.

Disclosed is an ISFET comprising a H<+>-sensing membrane consisting of RF-sputtering a-WO3. The a-WO3 / SiO2-gate ISFET of the present invention is very sensitive in aqueous solution, and particularly in acidic aqueous solution. The sensitivity of the present ISFET ranges from 50 to 58 mV / pH. In addition, the disclosed ISFET has high linearity. Accordingly, the disclosed ISFET can be used to detect effluent.

The invention relates to a difference common collector amplifying circuit which is a device of an amplifying signal current for decreasing the distortion factor of a power amplification circuit. At present, a well-known current amplifying circuit of a station amplifier generally adopts an OCL circuit, in which the utility ratio of a power supply is higher, the direct coupling is realized, the circuit is simple and the power is big, but the performance of common-mode interference resistance of the circuit is reduced because non-equilibrium design is adopted, and the distortion is larger. Based on a traditional monotube common collector amplifying circuit, the difference common collector amplifying circuit introduces a difference structure, and a fully symmetrical and balanceable circuit structure is used for resisting the common-mode interference. The invention can be mainly used in the fields of low-frequency signal current amplification, aural signal current amplification, amplifier impedance match, an amplifier high input impedance input circuit, an amplifier low input impedance output circuit, single end-balanced signal transformation, etc.

The present invention provides a sensor circuit. The sensor circuit comprises a first amplifier which receives a measurement signal via an input end thereof, amplifies the received signal, and outputs the amplified signal via a first output end thereof; a first current source which supplies current (Ir) flowing toward the input resistance (Ri) of the first amplifier; a second current source which supplies current (Ic) flowing toward the input capacitance (Ci) of the first amplifier; and a bias current source which reduces the direct current offset voltage in the output of the first amplifier.

The invention belongs to the field of an intelligent power device and a control device, in particular relates to a magnetic balanced harmonic elimination reactive compensation device and a method. According to the device and the method, three-phase unbalanced data of a circuit is acquired by a detector and is also stored and processed, the state of a load diverter switch on a load circuit is controlled so as to control access states of two branches connected with the detector, wherein one branch is provided with a magnetic balanced harmonic elimination device, the detector controls the load diverter switch to have access to the magnetic balanced harmonic elimination device according to power quality on a detection circuit of the detector when an exception occurs, and the original branch is cut off so as to perform magnetic balanced harmonic elimination. The method and the device have the following advantages that: 1, power supply quality is timely and accurately detected to reach economic operation, and operation loss of the original electromagnetic balanced power saver is effectively reduced; 2, switching in and switching out are convenient so as to guarantee power supply; 3, no-load loss can be effectively reduced; and 4, the device and the method are applicable for a place where a load condition is complicated and harmonic wave of a power grid is high, and power supply reliability is increased.

In aspects of the invention, a zap circuit and a decoder for decoding the output of the zap circuit turn ON only one analog switch in a selector. The selector delivers an electric potential at a node of a dividing resistor selected by the zap circuit. The output of the selector is delivered to the non-inverting input of an operational amplifier, and the output of the operational amplifier is delivered to the gate terminal of a MOSFET. The operational amplifier controls the gate of the MOSFET so that the potential at a current detecting resistor equals the output of the selector. As a result, a current proportional to the input voltage flows through the MOSFET. Because the current through a dividing resistor is also proportional to the input voltage, the total current is eventually proportional to the input voltage.

The invention relates to the field of alternating-current power source monitoring and measuring, and especially relates to a low-voltage switchgear feeder monitoring and measuring device. The device has functions like feeder switching status, feeder alarm tripping status, feeder current measurement, bus voltage measurement, feeder control output and communication. The device is installed on a low-voltage switchgear feeder screen to achieve a four-remote control function, and can be conveniently connected to an integrated automation system. The low-voltage switchgear feeder monitoring and measuring device adopts an M430F2491 embedded microcontroller controller as a core processor to monitor feeder switching status, feeder alarm tripping status, feeder current measurement, bus voltage measurement, feeder control output, communication and the like; the device integrates the functions of multiple pieces of original feeder measuring and monitoring equipment, and therefore, low-voltage switchgear feeder monitoring is more concise, and the level of automation is improved; and the device is integrated with the function of communication, so that operators can easily monitor the power and status of a low-voltage switchgear feeder and remotely control the tripping of a feeder branch.

The invention belongs to the technical field of terahertz radiation, and specifically relates to a terahertz photoelectric conductive antenna array and a use thereof. According to the terahertz photoelectric conductive antenna array disclosed in the invention, a choking coil is introduced to the antenna array, so that current diffusion to other antenna units can be prevented and stray capacitanceis improved, the input resistance of the terahertz photoelectric conductive antenna array is increased, and the matching efficiency and radiation efficiency are improved; compared with the antenna array without the choking coil, the input resistance of the photoelectric conductive antenna array disclosed in the invention is remarkably increased; and by virtue of the relatively high input resistance and low-temperature gallium arsenide and other semiconductor materials, the resistance differences of a formed illumination region are reduced, so that the matching efficiency and antenna radiationefficiency are improved, and the radiation power or detection sensitivity of the antenna are improved.

The invention discloses a novel electronic sphygmomanometer. The novel electronic sphygmomanometer comprises an air pump, a fixed deflation valve, a cuff, a BP 300 pressure sensor, a pre-amplification circuit, a filter circuit, a secondary amplification circuit, an Atmega16 single chip microcomputer and an LED display, wherein the cuff is connected with the air pump and the fixed deflation valve, the BP 300 pressure sensor is arranged on the cuff, a signal output end of the BP 300 pressure sensor is connected with a signal input end of the pre-amplification circuit, one path of a first signal output end of the pre-amplification circuit is connected with a first data input end of the Atmega16 single chip microcomputer, the other path of the first signal output end of the pre-amplification circuit passes through the filter circuit and then is connected with a second data input end of the Atmega16 single chip microcomputer, and a data output end of the Atmega16 single chip microcomputer is connected with a data input end of the LED display. The novel electronic sphygmomanometer has the advantages that the accurate pressure sensing can be realized, the air pressure inside the cuff can be converted into an electric signal, and the electronic measurement for the blood pressure value is realized through the oscillography principle.

The invention discloses a capacity coupling type electric field sensor used for dynamic electrocardiogram monitoring and relates to a sensor technology. The capacity coupling type electric field sensor used for dynamic electrocardiogram monitoring is mainly composed of a sensitive electrode, a source shield drive electrode, a dielectric layer, a buffer layer, a preposed operational amplifier, a sequent signal process system and the like. The front-loading operational amplifier integrates a protective structure, a bootstrap circuit and an input capacity bucking circuit, and the buffer layer which is made of polymer materials, strong in water absorption and capable of releasing moisture slowly is added on the dielectric layer. Due to the fact that the sensor implements electrocardiogram monitoring by adopting a method of capacity coupling, electrodes are not required to be contacted with skin directly, and the sensor has the advantages of being free of conductive paste, convenient to wear, convenient in dynamic monitoring for a long time and the like. In addition, by a method of controlling the buffer layer to release moisture, partial humid environment between the sensitive electrode and skin and clothes is changed, and static noise interruption caused by friction is greatly reduced.

The present invention relates to an input and output signal preservation circuit of an amplification circuit capable of preventing an attenuation of an input signal and an output signal of an amplification circuit in such a manner that an AC input signal is amplified using an amplification device such as a vacuum tube or a transistor in a preamplifier.

The invention discloses an infrared sensor which comprises a sensor body, transparent glass, epoxy glue, a filter, a connecting pin, a circuit component, a field effect transistor, a sensor body, a base and a casing. According to the invention, the filter and the transparent glass are arranged on the top of the casing to reduce the influence of various external heat sources and light sources on the pyroelectric infrared sensor; in order to have higher sensitivity to infrared radiation in a certain wavelength range, the filter is arranged in the casing; in addition to allowing passing of infrared radiation in certain wavelength ranges, the filter can reject light, sunlight and other infrared radiation; in addition, the field effect transistor is arranged in the casing, and the field effecttransistor has the advantages of high input resistance, low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown, wide safe working area and the like; a detection signal can be amplified; the performance is stable; the accuracy of the signal is improved; a desiccant is arranged inside the casing to prevent moisture inside the casing; and the service life of the product is improved.

A circuit for processing a wake-up signal, which is usable for activating electrical devices. The circuit includes an evaluation circuit, which checks an applied wake-up signal for its validity, and an output driver circuit, which outputs a processed wake-up signal when the evaluation circuit evaluates the applied wake-up signal as valid. The evaluation circuit has a comparator, which compares the applied wake-up signal to at least one threshold value for the evaluation. The evaluation circuit includes an input circuit and a switchable constant voltage source via which at least one criterion for evaluating the applied wake-up signal is adjustable in each case. The comparator is a multi-channel, integrated comparator circuit, and the individual channels of the integrated comparator circuit evaluating one criterion of an applied wake-up signal in each case.

The invention discloses a self-biased constant-current voltage stabilizing circuit. The self-biased constant-current voltage stabilizing circuit comprises an input signal detection module, a series constant-current tube and a shunt adjustor, and a second resistor and a capacitor, wherein the input signal detection module is connected between an input voltage end and the ground; the series constant-current tube is connected between the input voltage end and an output voltage end, and used for controlling all or a part of channels for inputting signals to an output end; the shunt adjustor is connected between the output voltage end and the ground; the second resistor and the capacitor are connected between the output voltage end and the ground respectively. The self-biased constant-current voltage stabilizing circuit disclosed by the invention is capable of furthest absorbing the current provided by a rectifier and ensuring no weakening for an amplitude-modulated signal on an antenna.

In aspects of the invention, a zap circuit and a decoder for decoding the output of the zap circuit turn ON only one analog switch in a selector. The selector delivers an electric potential at a node of a dividing resistor selected by the zap circuit. The output of the selector is delivered to the non-inverting input of an operational amplifier, and the output of the operational amplifier is delivered to the gate terminal of a MOSFET. The operational amplifier controls the gate of the MOSFET so that the potential at a current detecting resistor equals the output of the selector. As a result, a current proportional to the input voltage flows through the MOSFET. Because the current through a dividing resistor is also proportional to the input voltage, the total current is eventually proportional to the input voltage.

The invention discloses a power grid energy-saving constant current drive control system based on emitter coupled amplification. The system is composed of an EMI single-phase filter, a silicon controlled rectifier, a boosting type power factor correcting circuit, a single-phase high-frequency frequency converter, a sampling protection circuit connected with the single-phase high-frequency frequency converter, a single-chip microcomputer, a band-pass filtering low-distortion oscillating circuit and a boosting type constant current driving circuit. The system is characterized in that an emitter coupled amplification circuit is also connected between the sampling protection circuit and the single-chip microcomputer in series; the boosting type constant current driving circuit is adopted, has the functions of under-voltage locking protection, over-voltage protection and over-temperature protection, has extremely high driving stability, and can effectively improve the accuracy of the control system; meanwhile, the emitter coupled amplification circuit is adopted and has a stable quiescent operating point, stable output current and high input resistance, and the energy-saving effect of the system is effectively improved.

The invention belongs to the technical field of terahertz, and particularly relates to a terahertz antenna structure and a radiation source and detector comprising the same. The thickness of a semiconductor substrate of a conventional terahertz antenna structure is reduced to several micrometers from hundreds of micrometers, a high-dielectric constant silicon lens is substituted by a low-dielectric constant lens, thus, the input resistance of a metal antenna is improved, and the matching efficiency and the directivity are improved. By the terahertz antenna structure, the output power can be effectively improved by two or three times, and the detection sensitivity can be effectively improved; when the antenna is used as the radiation source, the output power is improved; and when the antenna is used as the detector, the detection sensitivity is improved.

The invention discloses a video frame preprocessing chip, comprising a preprocessing module, the input end of the preprocessing module is connected in parallel with a signal filtering module and a current injection module, and the signal filtering module controls the injection current of the current injection module through the current control module Take control. The invention can improve the deficiencies of the prior art, strengthen the video signal through the hardware circuit, and reduce the interference of the hardware circuit to the video signal at the same time.

The invention discloses a bootstrap circuit for a precise temperature sensor. An input end is connected to a non-inverting input end of a first operational amplifier through a first capacitor, the non-inverting input end of the first operational amplifier is connected to the bases of a first NPN audion and first PNP audion through first resistors separately, a collector of the first NPN audion isconnected to the non-inverting input end of the first operational amplifier through a second resistor and a third resistor which are in series connection, an emitter of the first NPN audion is connected to a collector of the first PNP audion, an emitter of the PNP audion is grounded through a third capacitor, the second resistor and the third resistor are connected to an inverting input end of thefirst operational amplifier through a second capacitor, the inverting input end of the first operational amplifier is connected to an output end of the first operational amplifier through a fourth resistor. The bootstrap circuit for the precise temperature sensor can overcome the deficiencies in the prior art, and reduces the amplitude of transient potential fluctuations occurring in the processof the input voltage change of the bootstrap circuit.

The invention provides a power supply concealed wiring line detector and a detection method, and relates to the field of power equipment. The power supply concealed wiring line detector comprises a shell, and a detection circuit is arranged in the shell; one end of the shell is provided with a detection end, the detection end is provided with a copper sheet, and the front surface of the shell is provided with a piezoelectric buzzer, an LED lamp, a sensitivity adjusting knob and a power switch; a battery box is arranged on one side face of the shell, and a battery is installed in the battery box; the battery supplies power to the detection circuit; and the detection circuit is connected with the copper sheet, the piezoelectric buzzer, the LED lamp, the sensitivity adjusting knob and the power switch, so that the copper sheet detects the line direction and distribution in the wall. The fault point can be detected and positioned when the line in the wall has a fault. The detector can be used for effectively determining the trend and distribution of lines in the wall, so that a maintainer can perform preliminary positioning and fault judgment on a fault point conveniently during fault maintenance, and large-area damage to a house structure is avoided.

The invention discloses a bionic circuit and method for a non-contact electrostatic potential distribution test, and the circuit comprises an electrostatic induction electrode array which comprises N electrostatic induction electrodes; the induction signal amplification circuit array comprises N signal amplification circuits which are connected with the N electrostatic induction electrodes in a one-to-one manner; the side suppression network circuit array comprises N side suppression circuits, each side suppression circuit comprises two analog switch cross arrays with N input ends and N output ends, and each output end is connected with a side suppression weight sub-circuit; the output ends of the N signal amplification circuits are in many-to-many full connection with the analog switch cross array; the side suppression weight sub-circuits are respectively connected with a forward input end or a reverse input end of an amplifier, a resistor R-is connected between the reverse input end and an output end of the amplifier, and the forward input end is grounded through a resistor R +; the microcontroller array comprises N microcontrollers which are connected with the N side suppression network circuits in a one-to-one manner; and the side suppression weight sub-circuit is connected with the analog switch cross array and the side suppression weight sub-circuit.