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5410273 Low distortion operational amplifier  
An op-amp comprising a single gain stage amplifier cascaded with a buffer and an output stage. The buffer comprises an amplifier which isolates the gain stage from the output stage to prevent...
5399991 High speed low power op-amp circuit  
A high speed operational amplifier includes a differential amplifier input stage capable of producing a pair of complementary differential outputs. Complementary current mirrors receive the...
5399988 FT doubler amplifier  
A transistor amplifier having a main amplifier exhibiting a substantially doubled fT characteristic and having error cancellation circuitry, wherein the standing current of the error cancellation...
5392002 Low voltage bipolar negative impedance converter  
A negative impedance converter utilizes a pair of transistors in a negative feedback configuration to thereby function as a positive differential resistance. The negative impedance converter also...
5389892 Input stages for high voltage operational amplifier  
A high voltage operational amplifier includes a first differential stage whose output is supplied to a current mirror amplifier (CMA) comprised of bipolar transistors, for driving a high voltage...
5365198 Wideband amplifier circuit using npn transistors  
A wideband amplifier circuit provides high current gain and a wide bandwidth by employing only npn transistors, which have better high-frequency characteristics than those of pnp transistors, in...
5361040 Self limiting and self biasing operational transconductance amplifier  
An operational transconductance amplifier (38) is coupled to first and second supply voltages (41, 42) for converting differential input signals into a proportional output current. The operational...
5359295 Power amplifier  
A power amplifier is provided, wherein the output of a first transistor supplied with an input signal at the base thereof is supplied to the base of a second transistor, a current proportional to...
5352992 Amplifier circuit  
An amplifier circuit having an emitter-grounded amplifying stage formed of a transistor Q1 and a load resistor RL and having an output stage including an emitter follower formed of transistors Q2...
5347231 Low noise charge sensitive preamplifier DC stabilized without a physical resistor  
The invention is a novel charge sensitive preamplifier (CSP) which has no resistor in parallel with the feedback capacitor. No resetting circuit is required to discharge the feedback capacitor....
5345346 Positive feedback low input capacitance differential amplifier  
A read preamplifier for use in reading data in a magnetic storage system uses positive feedback to reduce the preamplifier's input capacitance. The read preamplifier includes first and second...
5337010 Wide-band amplifier apparatus  
In a wide-band amplifier circuit, a third and a fourth transistors are cascaded externally with a first and a second transistors within an integrated circuit which are connected each to output...
5337011 Pre-amplifier  
A tiny pre-amplifier for a small, low voltage, high impedance signal source, usually an electret microphone, exhibiting near unity gain, has an input cascode stage connected to the microphone and...
5337007 High efficiency class AB transconductance amplifier  
A class AB transconductance amplifier (200) has first and second differential input amplifier stages (100-112) adapted for receiving first and second differential input signals (Vin+, Vin-). First...
5327097 Gain control circuit  
There is provided a gain control circuit which comprises a circuit unit composed of a transistor Q11, a first gain control unit 12 including transistors Q12 and Q13 having emitters connected to...
5323121 Folded cascode operational amplifier with gain enhancing base current compensation  
The gain of a folded cascode operational amplifier is enhanced by connecting the current circuits of added compensation transistors to supply the current circuits of pre-existing gain transistors....
5304869 BiCMOS digital amplifier  
A BiCMOS circuit for amplifying the difference voltage between two input voltage signals. The BiCMOS circuit of the present invention includes two bipolar junction transistor which receive the two...
5304946 Amplifier circuit having an operation point maintaining input and output voltages constant even if a gain thereof is varied  
An amplifier circuit includes a grounded-collector circuit for converting an input signal voltage into a first signal current, a second transistor circuit for transmitting the first signal current...
5294893 Differential output amplifier input stage with rail-to-rail common mode input range  
An amplifier having a rail-to-rail common mode input range that can be used in low voltage power supply applications includes differential input and output stages, the output stage having first...
5278516 Buffer circuit  
A buffer circuit provided with a transistor each on the input and output terminal sides, in which the transistor has been provided in order to keep constant a difference between a...
5276404 Constant current video amplifier  
This invention is a constant current, noninverting, voltage amplifier powered by a single polarity of electrical power with respect to a ground potential. In a preferred embodiment, the amplifier...
5274342 Microwave monolithic integrated circuit (MMIC) including distributed cascode bipolar transistor amplifier unit  
A microwave monolithic integrated circuit (MMIC) (40), includes a substrate (60), and an input bus (62), output bus (64), ground bus (66) and bias bus (68) formed as striplines of a four-line...
5268650 Amplifier circuit with bipolar and field-effect transistors  
An amplifier circuit (1) has an input stage (2), at least one intermediate stage (3) and an output stage (4). MOSFET transistors are used in the at least one intermediate stage (3), and bipolar...
5256984 Amplifier for controlling linear gain of wide band using external bias  
An amplifier for controlling the linear gain of wide band using an external bias voltage is disclosed to maintain the gain characteristics stably even for the high frequency input signals by...
5233311 Differential amplifier and oscillator mixer comprising said amplifier  
A differential amplifier of the cascode type comprises a differential stage which includes a first (T1) and a second (T2) transistor whose collectors are connected to an active load constituted by...
5218318 Variable gain amplifier  
A variable gain amplifier is provided which includes a pair of common emitter circuits. A resistance between the collectors of a pair of transistors included within the common emitter circuits is...
5218323 Transistor direct-coupled amplifier  
A transistor direct-coupled amplifier includes a positive-phase direct-coupled amplifier circuit, a second transistor, and a low-pass filter. The positive-phase direct-coupled amplifier circuit...
5216383 Controllable amplifier circuit  
A controllable amplifier circuit includes, successively, in a cascode arrangement between a power supply voltage and ground, a control transistor and a field effect amplifier transistor having a...
5216380 Performance operational amplifier and method of amplification  
An operational amplifier (10) is provided which includes a differential input stage (18) for receiving differential signals. A differential loop (30, 64), (86) amplifies said differential signals....
5202645 Stabilized transient response of a cascode CMOS amplifier  
Operational amplifiers are often used in unity gain configurations where the output is fed back to the input. In the noninverting buffer configuration the output is directly connected to the...
5185582 Differential amplifier, particularly of the cascode type  
A differential amplifier stage including a main pair of transistors (T1, T2) having their bases connected to a pair of input terminals (V1, V2) and their collectors coupled to a supply terminal...
5180989 Wideband amplifier  
A wideband amplifier is provided having a plurality of transistors, the bases of which are commonly grounded, a signal source for generating input signals, an input terminal connected to the...
5166635 Digital data line driver  
A cost-effective, low power and low distortion digital data line driver is disclosed with the capability to operate from a limited voltage source while maintaining wide output voltage swings. The...
5162749 Amplifier circuit having a feedback circuit  
An amplifier circuit is provided with first to third amplifying stages, a constant current source and a feedback circuit. The minimum value of current flowing through the output-stage transistor...
5155449 FET buffer amplifier  
An FET buffer amplifier having a serially connected input FET and bias current FET. The drain or source current of the input FET is detected by a detection resistor and the detected voltage is...
5153529 Rail-to-rail input stage of an operational amplifier  
An input stage of an operational amplifier uses current sources to allow first and second differential input transistor pairs to operate near the power supply rails. The output stage of the...
5144266 Broadband high frequency active MMIC circulator  
A broadband high frequency active MMIC circulator which includes low parasitic devices (MESFETs or HEMTs) and shunt feedback for impedance contouring in conjunction with a cascode/cascade...
5138278 Broadband signal amplifier  
A broadband signal amplifier includes a current conveyor (2) having a current control input (X), a voltage control input (Y) and an output (6). Signal control is provided at the current control...
5130667 Differential transimpedance amplifier  
A wideband transimpedance amplifier utilizing a differential amplifier circuit structure whereby the differential pair is bridged by a signal detector which, as an example, would be a...
5126689 Direct-coupled grounded-base amplifier, semiconductor device and information processing device having the amplifier therein  
A direct-coupled grounded-base amplifier comprising two or more grounded-base amplifying circuits. The same circuit used as the output stage of a first grounded-base amplifying circuit is mounted...
5099205 Balanced cascode current mirror  
A balanced cascode current mirror includes first and second current paths respectively defined by first and second transistors and by third and fourth transistors. Each current path may include...
5089791 MMIC-compatible power amplifier  
The parasitic capacitance which is inherent in an amplifier stage fabricated by MMIC or MIC technology oftentimes is cumbersome and of little use. The present invention utilizes this parasitic...
5077489 Comparator circuit implemented in the bipolar and MOS technology  
An electronic comparator circuit having a high speed during switch phase and combining the advantages of bipolar technology with those of CMOS technology. The circuit consists of a differential...
5072139 Interface circuit preventing noise generated between integrated circuits  
An interface circuit includes a power source terminal, an input terminal and NPN transistor. Th interface circuit further includes a first resistor connected between the emitter of the NPN...
5068623 High-gain amplifier with low noise and low power dissipation, using field effect transistors  
The amplifier comprises a first field effect transistor controlled by the input signal of the amplifier and a current generator for the supply of said first transistor. The latter is biased so as...
5066926 Segmented cascode HBT for microwave-frequency power amplifiers  
A cascode transistor configuration includes an input terminal for receiving the input signal, an output terminal for outputting the output signal and bass and emitter terminals connectable to...
5065111 Differential amplifying circuit operable at high speed  
A differential amplifying circuit includes a differential input portion, a load portion, a switching portion, and a constant current source. The differential input portion is connected to the...
5061903 High voltage modified cascode circuit  
A new type of high voltage FET circuit has been developed which offers a dramatic improvement in performance as compared to a common source amplifier stage. The new circuit offers inherent...
5055799 Amplifier circuit with non-linear load resistance which increases amplifier forward gain at high frequency  
An amplifier comprising a bipolar transistor with a non-linear load resistance (21) that increases the forward gain of the amplifier at high frequency. Voltage and thermal stability are provided...
5053718 Feedback control reducing signal distortion produced by differential amplifier stage  
A low distortion differential amplifier circuit includes a primary differential circuit stage and a secondary differential circuit stage. The primary differential circuit stage includes first and...