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6518839 |
Method and apparatus for effecting programmable gain amplification
A programmable gain amplifier ( 10 ) has a differential input ( 12-13 ), a differential output ( 16-17 ), and a plurality of enable inputs ( 21, 31-34 ). The amplifier includes a plurality of...
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6518842 |
Bipolar rail-to-rail input stage with selectable transition threshold
A bipolar rail-to-rail input stage includes complementary differential input pairs, and a switching circuit which makes one or the other of the input pairs active depending on the relationship...
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6501333 |
Differential amplifier circuit
A differential amplifier circuit comprises: an amplifying section including first and second current branches and an output stage which comprises a current sinking element and a control element....
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6496066 |
Fully differential operational amplifier of the folded cascode type
The present invention refers to a fully differential operational amplifier of the folded cascode type. In one embodiment the fully differential operational amplifier comprises: a differential...
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6489847 |
Low distoration driving amplifier for integrated filters
Several embodiments of an intermediate frequency (IF) amplifier, which exhibit improved distortion characteristics, are disclosed for use in an integrated transceiver circuit. The amplifier has a...
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6486735 |
Adaptive equalizer filter with variable gain control
There is disclosed an adaptive equalizer filter with a current splitting system for variable gain control. The system comprises a current splitting circuit that splits an input current into a first...
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6483382 |
Current compensation circuit for improved open-loop gain in an amplifier
A current compensation circuit for an amplifier, for example an operational amplifier, having input and output stages coupled at a high-impedance node, compensates for any modulation of current...
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6483383 |
Current controlled CMOS transconductive amplifier arrangement
A current controlled complementary metal-oxide-semiconductor transconductive amplifier arrangement includes a first transconductive amplifier and a control circuit to control the transconductance...
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6483384 |
High speed amplifier
The object of this invention is to realize high-speed rise and/or fall characteristics for amplifier without increasing transistor size or current consumption. A first rise sensing circuit 42 and...
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6480069 |
Active load circuit, and operational amplifier and comparator having the same
An active load circuit is provided, which is suitable for achieving an operational amplifier circuit, and which may cope with both output current capability and lower consumption current, with less...
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6469579 |
Boosted high gain, very wide common mode range, self-biased operational amplifier
A boosted high gain, very wide common mode range, self-biased operational amplifier comprising complementary differential transistor pairs biased by biasing transistors and current mirrors, and...
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6462619 |
Input stag of an operational amplifier
An input to a rail-to-rail, FET, operational amplifier having a transconductance that is constant throughout the operating range of the operational amplifier is presented. The input of an...
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6459338 |
Single loop output common mode feedback circuit for high performance class AB differential amplifier
A class AB input differential amplifier employs a single loop output common mode feedback circuit (CMFC) to achieve high performance by controlling the common mode output voltage. The CMFC includes...
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6456162 |
Operational amplifier with offset voltage centering, and low-voltage compatible
An operational amplifier includes an input stage, and a level-transforming stage with first and second arms. Each arm has at least one bipolar transistor. Input transistors are connected to the...
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6452450 |
Transconductance amplifier based precision half wave and full wave rectifier circuit
A transconductance amplifier-based, rectifier circuit architecture is configured to programmably provide normal or inverted, half-wave or full-wave rectification of a single ended or differentially...
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6452453 |
Constant-current generator, differential amplifier, and semiconductor integrated circuit
The constant-current generator comprises a bias transistor whose drain and gate are connected to each other, and an outputting transistor. The threshold voltage of the outputting transistor is...
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6448853 |
Distortion improvement in amplifiers
An improved amplifier includes an input stage differential amplifier ( 100 ) with an output forming a gain node ( 102 ), an output stage buffer ( 104 ) having an input connected to the gain node (...
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6441688 |
Single-to-differential buffer amplifier
A radio frequency single to differential buffer amplifier provides a 180 degree phase difference between two output signals by using a current mirroring circuit and using different referencing on...
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6437645 |
Slew rate boost circuitry and method
A differential input circuit ( 1 ) includes circuitry for generating slew boost currents to be supplied to an output stage of an operational amplifier. The differential input circuit ( 1 ) includes...
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6429743 |
Signal conversion circuit for stable differential amplification and semiconductor device provided with the same as input buffer
An input buffer of a signal level conversion circuit according to the present invention includes: a differential amplification circuit of a current mirror amplifier amplifying a potential...
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6420912 |
Voltage to current converter
A voltage-to-current circuit utilizes an NMOS-input voltage-to-current (V-I) converter and a PMOS-input V-I converter, with both driving a common gate output stage. Each of the V-I converters...
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6414552 |
Operational transconductance amplifier with a non-linear current mirror for improved slew rate
A non-linear current mirror is achieved. The non-linear current mirror is particularly useful in the output stage of an operational transconductance amplifier for improving slew rate and stability...
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6411164 |
Precision low power operational amplifier with gain invariant bandwith
A precision, low power operational amplifier employs a transconductance amplifier architecture to provide wide operational bandwidth at any closed looped gain, and maintain DC precision. A single...
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6411163 |
Transconductance amplifier circuit
A transconductance amplifier circuit, which may used in a subscriber line interface circuit, transforms a single ended input voltage into a precise, single ended output current, in a manner that is...
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6407637 |
Differential current mirror and method
There is disclosed a differential current mirror system and method for providing differential output current signals that are proportional to differential input current signals in which common mode...
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6392485 |
High slew rate differential amplifier circuit
It is an object of the present invention to provide a high slew rate differential amplifier circuit that can reduce current consumption while maintaining stability. A P-type MOS sub-current source...
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6392489 |
Precise integrated current mirrors
A high precision current control circuit (current mirror) is disclosed. As in prior current mirrors, a reference voltage is generated from the input reference current. An operational amplifier is...
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6388519 |
Multi-input differential amplifier circuit
A multi-input differential amplifier circuit capable of maintaining the linear characteristic of the input voltage and the output voltage and capable of enhancing the dynamic range and the linear...
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6384683 |
High performance intermediate stage circuit for a rail-to-rail input/output CMOS operational amplifier
An intermediate stage for a rail-to-rail input/output CMOS opamp includes a floating current source separating two current mirrors ( 151-154,155-158 ), where the ideal current source includes a...
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6380805 |
Operational amplifier with multiple complementary P-channel and N-channel input pairs to reduce transconductance variation
In accordance with the present invention complementary P-channel and N-channel input pairs of transistors form in an op amp. Two sets of such pairs are provided so that a transconductance range of...
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6373338 |
Differential current mirror system and methods
There is disclosed a differential current mirror system and method for providing differential output current signals that are proportional to differential input current signals in which common mode...
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6348817 |
Complementary current mode driver for high speed data communications
An integrated circuit driver provides, among other things, a high data communication rate, a large common mode output voltage range, avoidance of spikethrough current that increases power...
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6346855 |
Amplifier arrangement
In transconductance amplifier arrangements used in CATV systems, it is often desirable to set the value of the output impedance to a value equal to the system impedance that is often 75Ω. prior...
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6344651 |
Differential current mode output circuit for electro-optical sensor arrays
A differential current mode amplifier circuit ( 5,5′ ) includes a first circuit leg having a first current source providing a current I 1 coupled in series with a first transistor (m 1 ) at a...
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6323732 |
Differential amplifiers having β compensation biasing circuits therein
Differential amplifiers include biasing circuits therein that can automatically account for process and/or temperature induced variations in β and thereby more uniformly maintain the voltage gain...
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6316998 |
Differential amplifier and a method of compensation
In a differential amplifier that is formed by a first differential amplifier formed by a first FET (MP1), to which a first input is applied, and a second FET (MP2), to which a second input is...
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6316971 |
Comparing and amplifying detector circuit
A comparing detector circuit capable of operating regardless of input voltages thereto includes a first pair of transistors to which first and second input signal voltages are input for functioning...
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6317502 |
Electronic volume control circuit with controlled output characteristic
A volume control signal voltage is applied to one terminal of a resistor 50, flowing a current corresponding to the volume control signal voltage through the resistor 50. The other terminal of the...
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6316995 |
Input stage for constant gm amplifier circuit and method
An amplifier input stage having a constant input gm and including first and second differential transistor pair so as to provide operation with inputs at or near the upper and lower power supply...
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6307438 |
Multistage operational amplifier with stability control
A multistage operational amplifier includes a transconductor input stage, an output stage, and an intermediate stage. A first Miller capacitor is connected between the input and the output of the...
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6300833 |
DC gain enhancement for operational amplifiers
A self compensating operational amplifier (10) including a differential amplifier input stage (18) and a current mirror (24) having an input and an output coupled to the respective outputs (20, 22)...
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6300836 |
High gain, wide band amplifier
An amplifier circuit comprising a basic amplifier which includes a first and a second transistor of opposite type in which the emitter terminal of the first transistor is connected to the input of...
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6281750 |
Transistor amplifier
A transistor amplifier is described having a first transistor pair, which comprises a first and a second transistor, and having a second transistor pair, which comprises a third and a fourth...
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6278323 |
High gain, very wide common mode range, self-biased operational amplifier
A high gain, very wide common mode range, self-biased operational amplifier comprising complementary differential transistor pairs biased by biasing transistors and current mirrors, and further...
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6278322 |
Transconductance amplifier and automatic gain control device using it
A first output stage outputs current to an output terminal via current-mirror circuits based on a voltage difference input to non-inverting and inverting terminals. A second output stage comprises...
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6265944 |
Fully integrated broadband RF voltage amplifier with enhanced voltage gain and method
RF voltage amplifier circuits which have high voltage amplifier gain and input signal frequency range, and a method for boosting the voltage amplifier gain and input signal frequency range in such...
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6259322 |
Current efficient, ultra low noise differential gain amplifier architecture
A low noise, low current, high bandwidth differential amplifier circuit (30), including a first amplifier (44) driving a first transistor X 1 and having a first current source I 2 coupled to an...
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6236270 |
Operational amplifier circuit including folded cascode circuit
The operational amplifier circuit of the present invention includes a first pair of NMOS which receives a first and a second input voltages to respective gate electrodes and has the source...
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6236269 |
Complementary CMOS differential amplifier circuit
A complementary metal oxide semiconductor (CMOS) differential amplifier circuit uses complementary CMOS differential amplifier circuits connected in parallel at the differential input to generate a...
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6229394 |
Circuit providing a negative resistance to offset error voltage for use with a folded cascode amplifier
An offset error voltage cancellation circuit which may be used with a folded cascode amplifier. The folded cascode amplifier includes a differential amplifier having transistors (100) and (102)...
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