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| Number | Title | Issue Date |
| 7432761 | Amplifier circuit, semiconductor device and electronic apparatus It is desirable that some voltage can be supplied as emergency backup even upon occurrence of abnormality such as a failure. The amplifier circuit in a semiconductor device supplies an output signal having a voltage produced by amplifying an input voltage Vin from a... | 10/07/2008 |
| 7215197 | Programmable gain instrumentation amplifier with improved gain multiplexers In one embodiment, a programmable gain instrumentation amplifier comprises an input stage configured with a differential precision current conveyor circuit. The current conveyor circuit may be implemented with operational amplifiers coupled to gain-setting resistors... | 05/08/2007 |
| 7190935 | Amplifier power detection circuitry The present invention provides an efficient way to detect the transmit power provided by an amplifier. A power sense signal indicative of the transmit power of the amplifier is generated and fed back to a control system, which will react accordingly to control input... | 03/13/2007 |
| 7152800 | Preamplifier system having programmable resistance A biasing scheme is disclosed that helps reduce current noise in an associated device, such as, for example, a magneto-resistive device. The biasing scheme provides for setting a resistance path in a preamplifier, which is operative to energize the associated device... | 12/26/2006 |
| 7088174 | Offset cancellation and slice adjust amplifier circuit A method and apparatus to provide slice adjustment and offset cancellation in a high frequency limiting amplifier is described. ... | 08/08/2006 |
| 7072478 | Microphone preamplifier A microphone preamplifier. An electrical signal from a microphone is received via a shielded cable by an input stage cascaded with an output stage. The input stage contains an impedance converter and a phase inverter and receives feedback that reduces input capacita... | 07/04/2006 |
| 7062237 | Power amplifier (PA) with improved power regulation A circuit for regulating the power provided to a load connected to an output of a power amplifier. The circuit includes an amplitude detector that outputs a voltage corresponding to the amplitude of the signal outputted by the power amplifier. This output voltage is... | 06/13/2006 |
| 7039124 | Apparatus and method for compensating for analog quadrature modulation error An apparatus and method for compensating for an analog quadrature modulation (AQM) error in a linearization apparatus for AQM-modulating a digital predistorted signal and outputting the AQM-modulated signal through a high-power amplifier. In the apparatus and method... | 05/02/2006 |
| 7005915 | Series bridge circuit with amplifiers Two bridge type transducers are coupled in series with their outputs each driving one of a pair of differential amplifiers, with the outputs tied together in a push-pull configuration. In further embodiments, push-pull operation is obtained by matching amplifier gai... | 02/28/2006 |
| 6809596 | DC offset cancellation circuit, system and method Described are a circuit and system to provide an output signal in response to composite input signal comprising an AC signal component and a DC signal component. An amplifier provides an amplified voltage signal in response to a voltage representative of the composi... | 10/26/2004 |
| 6774715 | BiCMOS AC filter circuit An alternating current filter circuit for a BiCMOS differential amplifier has a circuit that computes a base current of the BiCMOS differential amplifier and a circuit that generates an offset current based upon the computing. ... | 08/10/2004 |
| 6700443 | Reduction of sensitivity of an amplifier to an offset voltage The invention relates to a method of amplifying an input signal having a DC component and an AC component. The method includes the steps of: comparing the input signal with a reference value, generating an intermediate signal by subtracting from the input... | 03/02/2004 |
| 6657488 | Offset correction and slicing level adjustment for amplifier circuits A slice and offset circuit is provided that uses a digital integrator in the feedback loop of the offset cancellation circuitry. A slice circuit receives an indication of a desired slice voltage and supplies a signal to specify the slice level, which is c... | 12/02/2003 |
| 6608525 | Operational transconductance amplifier and filter circuit The operational transconductance amplifier comprises a MOS field-effective transistor that controls the mutual conductance. The central voltage measurement circuit and the voltage addition circuit shift a gate voltage of the MOS field-effective transistor... | 08/19/2003 |
| 6603354 | Method and apparatus to generate an optimum common-mode voltage in analog differential circuits A method and apparatus to generate an optimum common-mode voltage in analog differential circuits are described. A first output voltage is generated as a function of a power supply voltage and a positive saturation voltage in a differential amplifier circ... | 08/05/2003 |
| 6580315 | System and method of maintaining an amplifier common-mode output voltage A low-power solution for maintaining an amplifier common-mode output voltage, regardless of whether the amplifier is on or off, that does not degrade the performance of the amplifier through the use of a passgate in the signal path.... | 06/17/2003 |
| 6577187 | Powered transducer preamplifier with DC level shifting circuit A powered transducer preamplifier includes a preamplifier circuit that DC couples the preamplifier input with the preamplifier output. A biasing circuit is coupled to the preamplifier input to apply a bias voltage to power the transducer, and a DC level s... | 06/10/2003 |
| 6335641 | Automatic input threshold selector An automatic input threshold selector includes a maximum value level decision circuit, and an input threshold setting circuit. The maximum value level decision circuit decides, among m+1 level layers defined by m maximum value decision levels, a level lay... | 01/01/2002 |
| 6232816 | Signal level monitoring circuit A signal level monitoring circuit for outputting either voltage or current corresponding to an input signal level, includes a variable gain unit for obtaining a predetermined output level without being dependent on a gain, when the input signal level is a... | 05/15/2001 |
| 5999045 | Amplification circuit which includes an input-current compensation device An amplification circuit comprising a device for compensating for its input current. The amplification circuit includes an amplifier and a capacitor located on the input side of the amplifier. The input-current compensation device consists of a current ge... | 12/07/1999 |
| 5801867 | DC-coupled receiver for shared optical system A dc-coupled receiver for a shared optical system includes an input feedback amplifier circuit which establishes a dc reference baseline voltage level for incoming packets of data. A pair of sample-and-hold circuits are connected in parallel to receive an... | 09/01/1998 |
| 5587681 | DC restoration circuit In a D.C. restoration circuit for a digital FM radio receiver, in which demodulated signals may be presented at the output of the demodulator as low-level differential signals superimposed on a variable D.C. level, the differential signal paths are capaci... | 12/24/1996 |
| 5585756 | Gated integrator with signal baseline subtraction An ultrafast, high precision gated integrator includes an opamp having differential inputs. A signal to be integrated is applied to one of the differential inputs through a first input network, and a signal indicative of the DC offset component of the sig... | 12/17/1996 |
| 5576658 | Pulse shaping circuit There is disclosed a rectangular filter which has a simple configuration and is capable of producing an improved rectangular wave. An input step wave is differentiated by a differentiator circuit and amplified by a first amplifier. The output from the amp... | 11/19/1996 |
| 5430766 | Burst mode digital data receiver A dc-coupled packet mode digital data receiver, for use with an optical bus uses peak detectors to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A dc compensator, responsive to outputs of the peak detectors, shunt... | 07/04/1995 |
| 5426389 | System for DC restoration of serially transmitted binary signals A device for restoring DC and non-zero average components of a serially transmitted binary signal which has been AC coupled. The device comprises an input port for the binary signal, a clamping circuit, a feedback network, a summing node, and an output po... | 06/20/1995 |
| 5059918 | Procedure and apparatus for amplification of a burst signal A controllable amplifier, which has two symmetrical outputs, at which two output signals mirror-symmetrical with respect to each other are present, is used for amplification of a burst signal. To achieve the largest possible eye opening of the signals to ... | 10/22/1991 |
| 5051708 | Amplifier arrangement with output power boosting In order to boost the output power of a first amplifier (A1) a second amplifier (A2) can increase the supply voltage difference across the first amplifier (A1). However, variations of the supply voltage difference result in comparatively high distortion. ... | 09/24/1991 |
| 4736391 | Threshold control with data receiver A binary data receiver data modulated light signals and applies them to a photodetector for producing electrical data signals which are amplified and applied to a data decision circuit. The data decision circuit compares the instantaneous value of the amp... | 04/05/1988 |
| 4714828 | Optoelectric transducer An optoelectronic transducer is proposed which includes a PIN diode (2) that delivers a current that is proportional to a light signal that is received. The diode is connected to the input of an inverting amplifier (4) that delivers a voltage signal v | 12/22/1987 |
| 4603303 | Level compensation circuit In an amplifier including an AC amplifier, its operation level shifts according to input waveforms. When a positive input signal is, for example, inputted, the circuit feeds out a synthesized signal to the amplifier in which signal a positive and negative... | 07/29/1986 |
| 4599571 | Level compensation circuit In an amplifier including an AC amplifier, its operation level shifts according to input waveforms. This invention describes a circuit to eliminate the level shift. An output of the AC amplifier is fed to a level shift detector, wherein the level shift is... | 07/08/1986 |
| 4463317 | FM demodulator with regulation of the output D.C. component A frequency modulation detector, includes an FM (frequency modulation) demodulator, an adder responsive to first and second signals for maintaining a constant D.C. level output signal, the first signal being the FM signal, and a feedback circuit connected... | 07/31/1984 |
| 4374362 | Instrument zeroing circuit An electronic interface circuit for coupling a source of analog signals to a measuring and/or recording device whereby the time varying component of the analog signal can be separated from any steady-state component, such as a DC bias, which may be presen... | 02/15/1983 |
| 4366440 | Adjustable contrast compressor A feedback amplifier is configured as a contrast compressor for video signals including a reference blanking level. A feedback resistance is divided into two resistors coupled at a juncture. Contrast compression is accomplished by a diode coupled to the j... | 12/28/1982 |
| 4363977 | Device for discriminating between two values of a signal with DC offset compensation A device for discriminating between two values of a signal using DC offset compensation including an automatic gain control circuit, a peak detector circuit and a feedback path from the peak detector circuit to the input circuit of the automatic gain cont... | 12/14/1982 |
| 4336615 | Linear loading for PWM filter An AM broadcast transmitter uses a PWM modulator that requires a pulse width filter. It has been found that the filter load varies over the modulation cycle resulting in distortion. To overcome this problem, a varying voltage is applied to an RF driver st... | 06/22/1982 |
| 4323852 | Fast recovery electrode amplifier A fast recovery audio amplifier for use in electrophysiology and other neurological tests and techniques relating to nerve and muscle functions. The fast recovery amplifier recovers from overload in less than one millisecond, thus enabling its use in clin... | 04/06/1982 |
| 4319197 | ECG Amplifier overload control An AC coupled amplifier system is protected from overloading input signals by means of a "bootstrap" circuit which provides a compensation signal substantially matching the overscale portion of such input signal and applies that compensation signal to the... | 03/09/1982 |
| 4237424 | Gated baseline corrector Input pulses are coupled through a delay network to a pulse amplifier. The amplifier includes feedback circuitry for correcting its output to a particular baseline level, generally zero volts. Within the amplifier feedback path is a gate, which is normall... | 12/02/1980 |