31results about How to "Small gain" patented technology

The variable gain amplifier includes a bias circuit (BC) 1, a matching circuit (MC) 2, a variable gain resistive feedback amplifier (FA) 3 and an output follower (EA) 4. The resistance values of the load resistance Rc and feedback resistance Rf are changed in cooperation. In a case of making the load resistance Rc a high resistance to set the low noise amplifier to a high gain, the feedback resistance Rf is also made a high resistance, the feedback time constant τfb(c1)≈2π·RfCbe / (1+gmRc) of the closed loop of the resistive negative feedback amplifier 3 becomes substantially constant, and then the amplifier has a gain small in frequency dependency over a wide bandwidth. In a case of making the load resistance Rc a low resistance to set the low noise amplifier to a low gain, the feedback resistance Rf is also made a low resistance. The feedback resistance Rf with the low resistance increases the negative feedback quantity, and thus the amplifier is set to a low gain. Also, the load resistance Rc is made a low resistance, and the feedback time constant τfb(c1) becomes substantially constant. The gain is not lowered further in a high frequency region.

Speakers are automatically identified in an audio (or video) source. The audio information is processed to identify potential segment boundaries. Homogeneous segments are clustered substantially concurrently with the segmentation routine, and a cluster identifier is assigned to each identified segment. A segmentation subroutine identifies potential segment boundaries using the BIC model selection criterion. A clustering subroutine uses a BIC model selection criterion to assign a cluster identifier to each of the identified segments. If the difference of BIC values for each model is positive, the two clusters are merged.

A lithographic apparatus including a position control system to control a position of a moveable object is presented, The position control system includes a position controller, an object represented as an object filter, a position feedback circuit, and an acceleration control system. The acceleration control system includes a subtractor and a first filter in a first circuit branch and a second filter in a second circuit branch. A position controller signal output from the position controller is input into the subtractor of the acceleration control system. An external disturbance force, however, is directly exerted upon the object. Thus, a first transfer function from the input of the subtractor to the acceleration of the object for the position controller force may be different than a second transfer function from the input of the object to the acceleration of the object for the disturbance force. Preferably, the first transfer function is identical to a transfer function for the position controller force in case no acceleration control system is present in the position control system.

The present invention provides an amplifier circuit comprising a differential amplifier and a negative feedback loop circuit, in which a positive feedback loop circuit having a gain smaller than a gain of the negative feedback loop circuit is formed inside the negative feedback loop circuit.

An object of the invention is to provide a wireless communication apparatus which can correct error flexibly without wasting consumed resources while maintaining the improvement of reliability resulted from error correction. The wireless communication apparatus (relay station) 12 includes a receiving antenna 41 for receiving signals transmitted from the transmission station, a receiving RF section 42 for high-frequency amplifying the received signal, an error correction decoding section 43 for subjecting the received signal to the error correction decoding processing and outputting soft decision values and decoded bits, an error detection section 44 for subjecting the signal after the error correction decoding processing to the hard decision processing to detect error of the signal subjected to the hard decision processing, a switching section 45 for switching the soft decision values and the decoded bits, a re-coding section 46 for re-coding extracted ones of the soft decision values, a transmission RF section 47 for modulating the re-coded soft decision values and a transmission antenna 48 for transmitting the signal to the receiving station.

Circuitry for providing non-uniform analog-to-digital (“A / D”) signal conversion for wideband signals is provided. The circuitry of the invention is optimized for wideband signals because it does not sacrifice the small-scale resolution of high-probability signal amplitudes while preventing the clipping of low-probability signal amplitudes. The circuitry includes a nonlinear amplifier and an A / D converter that may be uniform or non-uniform. The digital output of the A / D converter may be further processed by circuitry that has an output function that is the inverse of that of the nonlinear amplifier, so as to maintain linear A / D conversion.

A radio receiver receives transmitted radio waves from positioning satellites, and includes: a signal amplification unit configured to amplify a received signal; an acquisition unit configured to acquire a satellite signal from the amplified signal; and a control unit configured to obtain predetermined information from the acquired satellite signal, determine a reception condition of transmitted radio waves based on the processing condition of at least one of the obtainment and the acquisition unit, and performs operation setting of a gain of the signal amplification unit according to the determined reception condition, wherein the control unit performs the operation setting so that the gain set in the operation setting when the reception condition is determined to be a first reception condition is smaller than the gain set in the operation setting when the reception condition is determined to be a second reception condition inferior to the first reception condition.

A transport control method for use in transporting a medium in a predetermined direction by an upstream drive roller and a downstream drive roller, to operate the downstream drive roller by using PID control based on a detection value of a tension sensor disposed downstream of the upstream drive roller and upstream of the downstream drive roller for detecting tension. The transport control method includes a stable state determining step for determining, at time of the operation, whether a difference between the detection value of the tension sensors and a target value is within a stable width to make a stable state which maintains a stability time; and a gain decreasing step for decreasing a gain of the PID control to be less than an initial value when the difference is determined to be in the stable state.

A control device for an internal combustion engine comprises an air-fuel ratio control part configured to control the air-fuel ratio of the exhaust gas and a heating control part configured to control the heating of the air-fuel ratio sensors. The heating control part controls the sensor heaters so that the temperature of the upstream air-fuel ratio sensor becomes less than the activation temperature and so that the temperature of the downstream air-fuel ratio sensor becomes the activation temperature or more while the internal combustion engine is stopped by the automatic stop function. The air-fuel ratio control part controls the exhaust air-fuel ratio based on the outputs of the two air-fuel ratio sensors during engine operation and control the air-fuel ratio temporarily based on only the output of the downstream air-fuel ratio sensor after the internal combustion engine has been restarted after automatic stop.

An unstable optical resonator for an optically active medium comprising a spherical back mirror and a spherical outcoupling mirror is proposed, and an outcoupling which is asymmetrical in relation to the optical axis takes place therein.

A high-frequency receiver capable of improving both an interference-resistant characteristic and reception sensitivity is provided. A gain switch control unit includes: a signal level determination unit comparing a gain control voltage of an amplifying circuit with a reference voltage; and a gain switch controller provided between an output terminal of the signal level determination unit and a gain control input terminal provided to an amplifying circuit for gain control. When receiving a signal in a strong electric field area having a high possibility that a strong interference signal exists, a gain of the amplifying circuit is set to be smaller than that in a case of receiving a signal in a weak electric field area by a gain switch signal output from the gain switch controller.

A motor drive circuit includes a first amplifier circuit to amplify a difference between first and second position detection signals with a gain becoming smaller according to drop in power supply voltage, to output a first amplification signal, the first and second position detection signals being signals indicating a rotational position of a rotor in a motor, having a frequency corresponding to a rotation speed of the motor, and being opposite in phase to each other; a second amplifier circuit to amplify the difference between the first and second position detection signals with the gain, to output a second amplification signal opposite in phase to the first amplification signal; and a drive circuit to amplify the difference between the first amplification signal and the second amplification signal with a predetermined gain to be saturated at the power supply voltage, to output a driving voltage for driving the motor.

A mobile communication system controls switching a transmission diversity system for each channel, and improves the quality of the channel. When the channel type in an uplink is a channel for transmitting voice, open loop transmission diversity is used (steps S1→S3). When the channel type in an uplink is a channel for transmitting a packet, closed loop transmission diversity is used (steps S1→S2). Since the open loop transmission diversity or the closed loop transmission diversity which ever is more appropriate can be used, a transmission diversity system can be appropriately switched for each channel, thereby improving the quality of the channel.

A method is provided for controlling a neck detection for a welding power supply. The neck detection can be suitably performed even if the welding power supply is combined with another power supply for performing a simultaneous arc welding operation at a plurality of locations of a workpiece.

A voltage controlled oscillator comprising first and second differential delay cells. The first differential delay cell has a first control voltage input terminal. The second differential delay cell is coupled to the first differential delay cell in a loop and has a second control voltage input terminal. The second voltage input terminal is disconnected from the first voltage control input terminal. The first voltage control input terminal receives a first voltage signal, and the second voltage control input terminal receives a second voltage signal different from the first voltage signal.

The invention provides a method for switching between day and night modes of a CCD camera. The beneficial effect of the present invention is that the present invention controls the day-night conversion by replacing the photoresistor with a million CCD video detection technology inside the program. The sensor of the camera itself can transmit the gain value to the back end, that is, the program, and use this gain value to judge the external brightness information. When the brightness is high, the gain value is small, and when the brightness is low, the gain value is large. Therefore, when the light is dark, it needs to be increased. Gain to increase brightness. Conversely, when the gain value is large, it means that the light is very dark, thus controlling the day and night conversion mode of the camera. This makes up for the gap that the gain value cannot be adjusted by the photoresistor and avoids some misjudgments of the photoresistor and repeated switching due to brightness changes caused by turning on and off the infrared lamp.

A pre-amplifier for a magnetic resonance imaging radio-frequency coil. The pre-amplifier comprises an input matching circuit (1), an amplification circuit (2), an output matching circuit (3) and a narrow band filter (4) for filtering a magnetic resonance signal amplified through the amplification circuit (2). The present invention has the technical effect that the pre-amplifier for a magnetic resonance imaging radio-frequency coil generates a gain required by magnetic resonance imaging within a very small range near a magnetic resonance signal frequency point, but only generates a very small gain or has no amplification function completely at other frequency points, thereby significantly reducing the possibility of oscillation of the magnetic resonance imaging radio-frequency coil.

An automatic gain control circuit for a receive apparatus for a mobile object which automatically controls the gain of a variable gain amplifier amplifying a received signal from an antenna installed in the mobile object and outputting the amplified signal to the receive apparatus. The circuit comprises an intensity detector that detects an intensity of the received signal; a comparator that compares the detected intensity with first and second threshold voltages; and a controller that outputs a control signal for adjusting the gain to the variable gain amplifier based on the comparing results of the comparator so that the gain of the variable gain amplifier has a hysteresis with respect to the intensity of the received signal.

A method is provided for controlling a neck detection for a welding power supply. The neck detection can be suitably performed even if the welding power supply is combined with another power supply for performing a simultaneous arc welding operation at a plurality of locations of a workpiece. The method includes using a control target welding power supply together with another power supply for performing arc welding concurrently at a plurality of locations of a common workpiece, detecting a neck in a molten portion of a welding wire which is brought into short-circuiting contact with the common workpiece, reducing the welding current for forming an arc, and automatically adjusting a neck detection value.