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6753730 |
Differential amplifier and filter circuit using the same
A differential amplifier is constructed in such a manner that a unit includes the sources of a first and a second MOS transistor and the drain of a third MOS transistor are connected to each other,...
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6750714 |
Opamp with infinite open loop gain
An operational amplifier circuit connected to a bi-directional cascode current amplifier is disclosed. The operational amplifier uses the bi-directional cascode current amplifier to filter out the...
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6741134 |
DC feedback control circuit
A DC feedback control circuit for compensating for a DC voltage level shift in a transimpedance amplifier circuit having a transistor as a high speed switching device. The DC feedback control...
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6741130 |
High-speed output transconductance amplifier capable of operating at different voltage levels
A high-speed output transconductance amplifier (OTA) capable of operating at different voltage levels. The high-speed output transconductance amplifier configures a cross-coupled circuit with...
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6734737 |
Output distortion correction amplifier system
An output distortion correction amplifier system includes an input stage; a current mirror connected to the input stage; an output stage having its input connected to the input stage and a current...
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6731159 |
Mirroring circuit for operation at high frequencies
A mirroring circuit operating at high frequencies is provided. The mirroring circuit includes a first branch having a first transistor in series with a first resistor, a second branch having a...
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6731165 |
Electronic amplifier
An amplifier that accurately amplifies signals over a wide bandwidth, including DC, has a voltage-to-current converter, a feed-forward resistive element, a buffer, an input resistive element, a...
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6731169 |
Differential amplifier circuit
The first amplifier circuit D 1 is formed by connecting drains of a pair of N-channel MOS transistors forming the first current mirror circuit CM 1 respectively to the drains of P-channel MOS...
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6720817 |
All NPN class-AB log-domain integrator with supporting input and output circuitry for low-voltage and high-frequency continuous-time filtering
Two variations of a continuous-time instantaneous companding filter are integrated in a 25 GHz bipolar process. Their −3 dB frequencies are tunable in the ranges of 1-30 MHz and 30-100 MHz. The...
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6717466 |
Comparator
A comparator includes a differential amplifier stage comprising two emitter-interconnected bipolar transistors whose bases form the two inputs of the comparator, a first load element connected to...
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6717467 |
Wideband differential amplifier comprising a high frequency gain-drop compensator device
A wideband differential amplifier includes a first differential stage connected to a Miller stage allowing an open-loop gain increase. The Miller stage includes a current source and a...
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6717474 |
High-speed differential to single-ended converter
A differential to single-ended converter, which is composed of a transconductance amplifier, a current mirror and buffer circuit and a transimpedance stage, is disclosed. A differential voltage...
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6714074 |
Power amplifier clipping circuit for minimizing output distortion
A power amplifier clipping circuit prevents sudden output changes when clipped from excessive input voltage, and includes an input voltage divider, two bias transistors connected to a positive...
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6710655 |
Bipolar emitter couple pair transconductor for high speed operational amplifiers
An emitter coupled pair transconductor circuit includes: an emitter couple pair 20 and 21 ; and a tail current source coupled to the emitter couple pair wherein the tail current source provides...
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6710661 |
Low input impedance with amplifier
The present invention relates to an amplifier CD including a first and a second transistor T 1 and T 2 , connected in series between a power supply terminal VCC and ground terminal. According to...
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6703898 |
Differential amplifier comprising an unlocking device
A differential amplifier may include a first stage including a first transistor and a second transistor having the same polarity and assembled to constitute a differential amplifier. The first...
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6704560 |
Low-voltage transconductance amplifier/filters
Wireless communications devices must handle a wide range of useful signal levels and must also cope with large interfering signals of nearby frequencies. They often use transconductance...
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6680651 |
Current mirror and differential amplifier for providing large current ratio and high output impedence
A current mirror for providing a large current ratio and a high output impedance even in radio frequency operation and a differential amplifier including the same are provided. The current mirror...
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6664857 |
Two-stage operational amplifier
A two-stage operational amplifier has an input stage and a downstream output stage. In this configuration, the magnitude of a first supply potential which supplies the input stage and is provided...
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6664854 |
Base band filter including a semiconductor integrated circuit
When an input signal to be amplified is very small and a large blocking signal having a high frequency is included in an input, it is necessary for a filter for mobile communication for removing...
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6653900 |
Driving method and related apparatus for improving power efficiency of an operational transconductance amplifier
A driving method for improving power efficiency of an operational transconductance amplifier. The operational transconductance amplifier comprises a first current route and a second current route...
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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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6650183 |
Amplifier apparatus for an output stage of a laser driver circuit
Known differential pair amplifier circuits can suffer from transistor saturation resulting in a reduction in switching speed. An alternative to the differential pair amplifier circuit is a...
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6642793 |
Differential current mirror system 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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6642792 |
Signal amplification device with circuit maintaining potential of input side of current mirror circuit at predetermined value
A differential amplifier circuit section ( 10 ), which realizes a reduction in power consumption of a signal amplification device, converts an input voltage signal into a current signal and then...
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6628168 |
Multiple input, fully differential, wide common-mode, folded-cascode amplifier
A multiple input, fully differential amplifier. Embodiments make use of complementary differential transistors pairs connected with cascode transistors to form folded cascode pairs, to achieve wide...
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6621259 |
Current sense amplifier and method
A current sense amplifier ( 10 ) for measuring current flowing through a sense resistor ( 12 ) coupled between first ( 11 ) and second ( 13 ) terminals, respectively, of the current sense...
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6617923 |
Linear transconductance amplifier
A linear transconductance amplifier which is easily implemented with LSI and superior in a frequency characteristic. The linear transconductance amplifier includes N-channel MOS transistors M 1, M...
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6614302 |
CMOS operational amplifier circuit
A CMOS operational amplification circuit is provided with a first differential amplifier having differential MOS transistors of one of P channel and N channel which receive an input signal; a...
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6600372 |
Attenuator control circuit
An attenuator control circuit for controlling operation of a differential pair attenuator to provide linear in decibels (dB) operation and temperature and process-independent operation. The...
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6600371 |
Low noise amplifier
It is shown a low noise amplifier comprising a first circuit block suitable for converting a first amplifier input voltage signal into current, a second circuit block adapted to divide the current...
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6590452 |
High DC gain cascode amplifier stage with low noise performance
A cascode stage includes a gain boost circuit arrangement in a folded cascode type of operational amplifier. The gain boost circuit arrangement improves the overall DC gain of the operational...
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6590433 |
Reduced power consumption bi-directional buffer
A bi-directional buffer includes the capability to turn the current mirror off when the bi-directional buffer is in the receive mode and quickly turn the current mirror on when the bi-directional...
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6590454 |
System and method for current splitting for variable gain control
There is disclosed a system and method for current splitting for variable gain control. The system comprises a current splitting circuit that splits an input current into a first current portion...
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6586997 |
Input distortion correction current-feedback amplifier system
An input distortion correction current-feedback amplifier system includes a current mirror; an input stage connected to the input of the current mirror; an output stage connected to the output of...
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6586995 |
Amplifier
An amplifier includes a first voltage follower including P-type MOS transistors and a second voltage follower including N-type MOS transistors. The first voltage follower amplifies without being...
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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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6580326 |
High-bandwidth low-voltage gain cell and voltage follower having an enhanced transconductance
A voltage buffer and follower includes a single ended output, a source follower, and a current feedback loop. The current feedback loop is coupled to the source follower and to the single ended...
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6566955 |
High bandwidth transresistance amplifier
An improved transresistance amplifier for generating an output voltage from an input current includes: a current buffer for shifting a dominant pole associated with the input current to a higher...
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6566951 |
Low voltage variable gain amplifier having constant common mode DC output
A variable gain amplifier includes a differential transconductor, a differential gain stage, a DC compensation circuit and first and second load resistors. The differential transconductor has first...
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6566961 |
Wide-band single-ended to differential converter in CMOS technology
A wide-band single-ended to differential converter (DC to 1 GHz) with very low amplitude and phase matching errors, of the order of 0.01 dB and 0.15 degrees respectively and using CMOS technology,...
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6552613 |
Output stage amplifier with compensation circuitry
An output stage amplifier circuit in accordance with the present invention overcomes many shortcomings of the prior art. A output stage amplifier circuit for providing a high output voltage and...
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6549070 |
High gain amplifier with current limited positive feedback
A high gain amplifier includes an intermediate gain stage; an output gain stage driven by the intermediate gain stage; an input stage, for driving the intermediate gain stage, which is balanced...
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6549072 |
Operational amplifier having improved input offset performance
A low-power operational amplifier comprises a differential input-stage and an output stage. The differential input-stage includes first and second differentially coupled input transistors each...
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6542030 |
Amplifier with stabilization means
An amplifier comprising an input stage (IP ST ) having a pair of inputs (INN,INI) for receiving a differential input signal (V in ) and a pair of outputs (CQ 6 ,CQ 7 ) for delivering a differential...
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6538503 |
Instrumentation amplifier and method for obtaining high common mode rejection
An instrumentation amplifier is provided which can provide high common mode rejection without the use of precision resistors. The instrumentation amplifier can be configured in an 8-pin layout,...
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6535061 |
Configurable operational amplifier as a microcontroller peripheral
A configurable operational amplifier which is programmed to specific characteristics and parameters for various requirements in the measurement of analog signals. These programmable characteristics...
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6531922 |
DC-coupling approach for current mode circuits
The present invention is directed to advantages discovered in connection with controlling DC current passing between and adversely affecting cascaded current-mode blocks. According to a particular...
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6529076 |
Fast saturation recovery operational amplifier input stage
An operational amplifier input stage includes a first differential input transistor and a second differential input transistor receiving a differential input voltage. A first translinear loop is...
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6525608 |
High gain, high bandwidth, fully differential amplifier
A differential-input, differential-output CMOS amplifier having a first differential pair with a first transistor folded with a first cascode transistor, and a second differential pair with a first...
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