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6741131 |
DC-compensation loop for variable gain amplifier
An apparatus consisting of a variable gain amplifier having an input and an output having a DC-offset compensation loop connected between the output and the input of the variable gain amplifier....
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6741132 |
Low noise level differential amplifier
A low noise differential amplifier structure comprising a first amplifier provided with an output stage with a Miller capacitor having a first electrode and a second electrode connected to the...
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6734702 |
Impedance calibration circuit
An impedance calibration circuit for a serial ATA (SATA) transmitter has a resistor in series with each leg of the differential output of the transmitter. An array of selectable resistors is in...
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6734746 |
Mute circuit
To provide a mute circuit capable of reducing or eliminating noises generated in accordance with an offset voltage under a mute operation. The present invention comprises a summing amplifier,...
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6734723 |
Chopper chopper-stabilized operational amplifiers and methods
An amplifier topology that combines the use of chopping and chopper stabilization, and may include auto-zeroing to achieve this very low offset. The use of choppers guarantees a very low offset,...
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6731163 |
Miller de-compensation for differential input, differential output amplifier
A Miller de-compensation technique and circuit is provided for a differential input, differential output (DIDO) amplifier that facilitates increased differential mode bandwidth while maintaining...
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6727749 |
Switched capacitor summing system and method
An apparatus and method for adding input voltage signals. First and second input voltage signals are respectively sampled onto first and second capacitors during a first clock phase. In response to...
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6727748 |
Highly efficient constant transconductance power amplifier
The present invention discloses a highly efficient constant transconductance power amplifier. an embodiment of the invention comprises a positive error amplifier, a negative error amplifier, four...
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6724248 |
DC offset self-calibration system for a digital switching amplifier
A differential amplifier includes first and second outputs and first and second supply rails. The differential amplifier further includes offset cancellation circuitry. The offset cancellation...
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6720827 |
Differential transimpedance amplifier for optical communication
A differential transimpedance amplifier includes a differential transconductance stage to provide a current to a differential transimpedance stage. The differential transimpedance stage includes...
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6717468 |
Dynamically biased full-swing operation amplifier for an active matrix liquid crystal display driver
A versatile amplifier circuit for driving a TFT LCD panel is disclosed. The amplifier circuit of the present comprises consists of a complementary input stage, biasing switches, and a rail-to-rail...
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6714066 |
Integrated programmable continuous time filter with programmable capacitor arrays
A programmable capacitor array including a plurality of user-selectable, numerically weighted capacitors, each of which includes at least one fixed capacitor and one manufacturer-controlled trim...
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6710645 |
Amplifier circuit with offset compensation, in particular for digital modulation devices
An offset voltage at an output of a differential amplifier is compensated for by a control circuit having a digital setting device. The control circuit has a control device which is controlled by...
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6707336 |
Operational amplifier with chopped input transistor pair
The invention relates to an operational amplifier comprising a first transistor amplifier stage at an input of the operational amplifier, which first transistor amplifier stage comprises chopped...
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6700522 |
Signal settling device and method
A method and device are configured for providing for both quick and accurate signal settling. A high accuracy component is configured in parallel with a high speed component. The high accuracy...
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6700439 |
Zero-bias bypass switch
A zero bypass apparatus for a low noise amplifier includes a bypass circuit, and a switching circuit coupled with a low noise amplifier and with the bypass circuit. The switching circuit includes...
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6696890 |
Differential signal transfer circuit
A differential signal transfer circuit to control the common mode level of a differential signal, comprising an input common mode level detection circuit, for detecting the common mode level of an...
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6696894 |
Operational amplifier with independent input offset trim for high and low common mode input voltages
An operational amplifier provides independent trimming of V os for both high and low common mode input voltages. The amplifier includes complementary input pairs, and employs a steering circuit...
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6674322 |
Amplifier circuit with offset compensation
An amplifier circuit with offset compensation is particularly suited for a Hall element. In addition to the useful signal demodulation that is normally present and connected downstream of an...
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6664850 |
Delay variability reduction method and apparatus
A method for reducing delay variability in a differential receiver includes receiving a plurality of differential input signals, determining a first transition delay time of an output in response...
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6661283 |
Wide gain range and fine gain step programmable gain amplifier with single stage switched capacitor circuit
The present invention is directed towards a single stage switched capacitor programmable gain amplifier. The operation of the amplifier is described by a transfer function having two gain factors:...
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6661288 |
Apparatus for effecting high speed switching of a communication signal
An apparatus for effecting high speed switching of a communication signal between a first component and a second component includes: (a) a switching circuit configured for receiving the signal from...
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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...
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6657487 |
Photodetector preamplifier circuit having a rotating input stage
An amplifier circuit ( 10 ) having a rotating input stage has a switching network ( 12 ) connected to an input ( 14 ). A number of parallel transconductance gain stages ( 16 ) are connected to the...
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6653886 |
Power saving amplifier with selectable current levels
Power available to an amplifier is controlled so that relatively high power is provided during one phase of operation, such as during an interval when slewing could normally occur and relatively...
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6653895 |
Gain-boost nulling amplifier for auto-zero circuit
A nulling amplifier ( 52 A) for an auto-zeroed amplifier includes a first differential stage including first ( 3 ) and second ( 16 ) input transistors and a second differential stage including...
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6653893 |
Voltage margin testing of a transmission line analog signal using a variable offset comparator in a data receiver circuit
A data receiver circuit having a comparator that exhibits substantially variable offset that is controllable to represent a variable reference level, without a separate input to receive a reference...
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6653894 |
Integrated current mirror in output stage of operational amplifier
A current mirror configuration can be integrated in the output stage of an operational amplifier that enables rail-to-rail performance without requiring a significant increase in headroom. The...
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6639460 |
Residual offset correction method and circuit for chopper stabilized amplifiers
An improved circuit and technique are provided that facilitate residual offset correction during chopper stabilization of an amplifier circuit. A chopper stabilized amplifier can be configured with...
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6628167 |
Linearized folding amplifier
A linearized folding amplifier circuit ( 30 ) includes a comparator ( 40 ) that has a first state and a second state, and a switched output circuit that has a pair of outputs. The non-linearity in...
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6628169 |
Method and circuit for trimming offset and temperature drift
An exemplary trimming circuit can be further simplified to include a single current source to provide for trimming of offset and temperature drift in a device, such as an op amp, voltage reference...
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6621333 |
Circuit and method to counter offset voltage induced by load changes
A circuit for countering offset voltage in an amplifier induced by changes in the output load. The circuit comprises an input stage, an output stage, and first and second current compensation...
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6621334 |
Frequency-compensated, multistage amplifier configuration and method for operating a frequency-compensated amplifier configuration
A frequency compensation circuit includes a first and a second compensation capacitor for a frequency-compensated amplifier to which a chopped useful signal can be supplied. In a first clock phase,...
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6617918 |
Multi-level receiver circuit with digital output using a variable offset comparator
A number of comparators are provided where each has a differential input coupled to receive a transmission line analog signal level. Each comparator has substantially variable offset that is...
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6614285 |
Switched capacitor integrator having very low power and low distortion and noise
Power available to an integrator circuit is controlled so that relatively high power is provided during one phase of operation, such as during an interval when slewing in a device is expected and...
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6614296 |
Equalization of a transmission line signal using a variable offset comparator
According to an embodiment, an equalization loop has a comparator with an input to receive a transmission line analog signal level. The comparator has a substantially variable offset that is...
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6614280 |
Voltage buffer for large gate loads with rail-to-rail operation and preferable use in LDO's
Described is a low-dropout (LDO) voltage buffer implemented in CMOS with nearly rail-to-ail in/output operation which is capable of driving a large MOS gate. The voltage buffer utilizes a single...
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6605990 |
Balanced transformer-less amplifier and an offset detection and correction system therefore
A balanced transformer-less amplifier includes a system for detecting and correcting DC offset across the output terminals of the amplifier. The output signal is digitized, counted during a...
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6606049 |
Analog to digital converters based on transconveyance amplifiers
Transconveyance amplifiers, and more specifically charge transfer amplifiers, are included in analog-to-digital converters. Transconveyance amplifiers are used in averaging and interpolation...
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6597239 |
Offset control of an operational amplifier
An operational amplifier arrangement (OA) including an operational amplifier (A) and an input offset control circuit (IOCS) is characterized in that said operational amplifier arrangement further...
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6586989 |
Nonlinear digital differential amplifier offset calibration
Circuits and methods for calibrating offset error in a differential amplifier in an efficient and reliable way are described. A final calibrated state for the differential amplifier is obtained in...
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6586990 |
Operational amplifier having offset cancel function
An operational amplifier, which generates an output voltage at an output terminal that is equal to an input voltage, comprises: a differential circuit, which compares the input voltage and the...
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6583660 |
Active auto zero circuit for time continuous open loop amplifiers
An active offset cancellation circuit for an open loop differential amplifier is disclosed. The amplifier is operated on a two-phase clock where the normal operation occurs on the first phase and...
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6584365 |
Electronic trip device with offset correction means
An electronic trip device including an analog measuring for measuring electrical signals, analog-to-digital conversion having an input connected to the analog measuring an output having a first...
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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...
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6577185 |
Multi-stage operational amplifier for interstage amplification in a pipeline analog-to-digital converter
An operational amplifier for a pipeline analog-to-digital converter (ADC). The operational amplifier includes a cascaded chain of differential amplifiers, each differential amplifier including...
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6577183 |
Offset correction circuit
An offset correction circuit loop with summing nodes, a variable gain transconductance amplifier and capacitor. The input to the loop is sent to a first summing node and then to a separate circuit....
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6573783 |
Method and apparatus for open-loop input offset adjustment in a differential amplifier
An open loop offset trim system for use with a differential amplifier includes a reference generator, an offset detector and a trim circuit. To reduce offset, the differential amplifier is placed...
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6573785 |
Method, apparatus, and system for common mode feedback circuit using switched capacitors
According to one aspect of the invention, an apparatus is provided which includes a first amplifier and a common mode feedback circuit. The first amplifier includes a first input, a second input, a...
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6573784 |
Low power wide bandwidth programmable gain CDS amplifier/instrumentation amplifier
A method and circuitry for implementing programmable gain. More particularly, embodiments of the present invention provide an amplifier circuit which can be used as a CDS-amp or an instrumentation...
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