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6806778 Darlington cascode  
An apparatus comprising a Darlington transistor pair and a common-base transistor. The Darlington transistor pair may be configured to generate an output signal at an output node in response to an...
6806769 Differential amplifier  
A differential amplifier comprises an emitter follower, a differential amplifying circuit connected in a succeeding stage to the emitter follower, and a load circuit to compensate distortion of...
6806777 Ultra wide band low noise amplifier and method  
An ultra wide band (UWB) low noise amplifier (LNA) includes a common-gate (CG) amplifying element in cascode with a common-source (CS) amplifying element, and a load-tracking (LT) network to, at...
6803824 Dynamic matching in cascode circuits  
A method and apparatus for a variable gain cascode amplifier (or attenuator) is disclosed. Embodiments provide for a compensated input impedance. A gain/impedance controller compensates input...
6801084 Transimpedance amplifier and circuit including the same  
Disclosed is a four stage transimpedance amplifier having a grounded base transistor preamplifier input stage, a common emitter voltage amplifier stage, and an amplifier stage having a common...
6798281 Two-input/two-output broadband active selector switch with distributed structure, and phase control device comprising such a switch  
An active selector switch with two inputs and two outputs comprises two parts, each part comprising a distributed amplifier whose elementary cells comprise at least two cascode-mounted transistors...
6788143 Cascode stage for an operational amplifier  
A cascode stage is arranged to improve performance of an operational amplifier. The cascode stage includes transistors that are arranged to operate as a current mirror. Each side of the current...
6778013 Buffer amplifier structures with enhanced linearity  
Buffer amplifiers are provided with a replica current generator that supplements a buffer transistor and is configured to provide a replica current which substantially equals required load...
6778016 Simple self-biased cascode amplifier circuit  
A self-biased cascade amplifier circuit includes first and second transistors connected in series and coupled between a dc voltage source terminal and a common terminal. An input signal terminal...
6768380 Wideband, variable-bandwidth distributed amplifier  
A variable bandwidth, distributed amplifier circuit includes an input transmission line; an output transmission line; and a plurality of amplifier cells having a respective plurality of cell...
6765438 Transconductance power amplifier  
A transconductance power amplifier for amplifying a signal to a capacitive load, including a first N-channel enhancement MOSFET transistor operatively arranged to source current to the capacitive...
6744322 High performance BiFET low noise amplifier  
According to one exemplary embodiment, a circuit comprises a bipolar transistor having a base, an emitter, and a collector. For example, the bipolar transistor can be an NPN SiGe HBT. The base of...
6731175 High frequency amplifier  
A high frequency amplifier. The amplifier includes two transistors for signal amplification, and input and output matching circuits. There are variable capacitors and resistors in the matching...
6724270 Oscillation circuit of cascode connection type  
An oscillation circuit comprises first and second transistors and a load. The first transistor includes a base inputted an oscillation signal, an emitter connected to a ground potential, and a...
6724259 Variable gain amplifier  
It is an object of the present invention to provide a variable gain amplifier of which impedance does not change when gains are switched. A transistor is turned on in a high-gain state and...
6724257 Error amplifier circuit  
An error amplifier circuit includes a differential amplifier with a cascode gain stage and an amplifier. The differential amplifier receives a first input signal and a second input signal and...
6690239 High bandwidth, low power, single stage cascode transimpedance amplifier for short haul optical links  
A high bandwidth, single stage, low power cascode transimpedance amplifier for short haul optical links. In one embodiment, an input signal is fed into the source of a common-gate pMOSFET, the...
6670851 Cascode amplifier integrated circuit with frequency compensation capability  
A cascode amplifier integrated circuit (IC) with frequency compensation capability that possesses a tight overall variation in transient rise and fall time, is relatively small in size and has a...
6667661 Laser diode driver with high power efficiency  
A laser diode driver circuit is disclosed that uses a cascode output stage having high-impedance load and a matching network for reducing mismatch interference. Due to the high-impedance load,...
6651021 System using adaptive circuitry to improve performance and provide linearity and dynamic range on demand  
The invention discloses a system for improving performance of the RF amplification stage of communication receivers by accounting for the signal environment of the RF amplifier. The linearity,...
6642794 Noise and input impedance matched amplifier  
An amplifier, in particular an RF amplifier is described having an amplifier input, the amplifier comprises: a first controllable semiconductor having a first controllable mainstream path coupled...
6642788 Differential cascode amplifier  
A differential amplifier amplifies input signals and includes first and second differential input transistor pairs. The first input pair controls output voltages by adjusting sink currents coupled...
6636119 Compact cascode radio frequency CMOS power amplifier  
An integrated circuit chip includes a cascode amplifier having a first NMOS transistor with the gate receiving an input signal a source connected to ground through an inductance and a drain...
6621348 Variable gain amplifier with autobiasing supply regulation  
A high gain wide-band width RF amplifier 120 with automatic bias supply regulation. The load supply is actively adjusted in response to the amplifier's output signal level. At small output signals...
6614312 Low noise amplifier and imaging element using same  
An imaging element that includes a photodiode and an amplifier for integrating photocurrent from the photodiode. The amplifier includes an input follower, a level shifter, and an output amplifier....
6614306 Bias circuit for class AB high frequency amplifiers  
A high-speed cascode amplifier includes a cascode input stage. The cascode input stage sinks a cascode current in proportion to an input signal. The cascode current is sourced through two...
6603351 Power amplifier with gain change compensation  
A high-frequency power amplifier is provided, which suppresses effectively the distortion induced by gain deviation or fluctuation occurring in at least one of the amplifier stages without using...
6600377 Gain control amplifier  
To provide an amplifier in which an amount of variation in output impedance between high- and low-gain modes is small and gain control can be accomplished accurately. A radio frequency signal...
6590456 Active cascode amplifier with an amplitude limiter  
An active cascode amplifier circuit which includes an active cascode amplifier and an amplitude limiter. The active cascode amplifier includes an input stage, an output stage and an auxiliary...
6583673 Stability enhanced multistage power amplifier  
A multistage power amplifier circuit with superior isolation between gain stages provides alternative common lead currents paths from the individual gain stage elements to obtain improved...
6583670 CMOS current amplifier  
This invention relates to a method and apparatus for amplifying an input current into an output current. An input current is first injected in or pulled out of a transimpedance stage and...
6577197 High frequency compensation circuit for high frequency amplifiers  
A cascode amplifier includes a cascode input stage that provides a first current in response to an input signal. A second current is also provided in response to the input signal, where the second...
6566963 Transformer-based low noise variable gain driver amplifier  
An input amplifier stage couples its output power to a second gain stage through a transformer. The transformer coupling allows for the removal of a diode voltage drop at a second gain stage,...
6556085 Low power low noise amplifier  
A low power low noise amplifier achieves a high power gain without increasing power consumption by sharing the bias current. The amplifier is composed of a cascade structure which consists of a...
6542036 Low current amplifier circuit with protection against static electricity  
A low current amplifier circuit which stably operates at a low current and has a reduced tendency to cause static breakdown includes first and second field-effect transistors. The first...
6542037 Low distortion broadband amplifier using GaAs pHEMT devices  
A broadband power amplifier circuit providing wide bandwidth with low distortion. The broadband power amplifier circuit includes a GaAs pHEMT MMIC with two (2) serially coupled cascode amplifiers...
6515547 Self-biased cascode RF power amplifier in sub-micron technical field  
A method for increasing the maximum useable supply voltage in an amplifier circuit is presented. A self-biased cascode amplifier circuit includes a first MOSFET and a second MOSFET connected in...
6504435 Feedback clamp circuit to prevent overcharge in compensation capacitor  
The present invention provides a dual stage amplifier with a clamping circuit and a methodology, along with a clamping circuit for use with a dual stage amplifier, which eliminate or reduce the...
6498533 Bootstrapped dual-gate class E amplifier circuit  
A bootstrapped dual-gate Class E amplifier circuit includes a first MOSFET and a second MOSFET connected in series and coupled between a dc voltage source terminal and a common terminal. An rf...
6496074 Cascode bootstrapped analog power amplifier circuit  
A cascode bootstrapped analog power amplifier circuit includes a first MOSFET and a second MOSFET connected in series and coupled between a dc voltage source terminal and a common terminal. An rf...
6496069 Cascode circuit capable of contributing a comparatively low intermodulation distortion in the amplified signals  
An amplifier has a cascade circuit including an input circuit, a cascode circuit and an output circuit. The input circuit receives input signals via an input (10), which input signals are...
6483168 Integrated circuit having resistor formed over emitter of vertical bipolar transistor  
An integrated circuit including a resistor that at least partially overlies a first tub of semiconductor material of a first polarity, where the first tub is formed in a second tub of...
6476680 Cascode amplifying circuit and folded cascode amplifying circuit  
To provide a cascode amplifying circuit having large amplifying gain without narrowing an output operational range or deteriorating response performance of the circuit even with a constitution by...
6472941 Distributed amplifier with terminating circuit capable of improving gain flatness at low frequencies  
A plurality of amplifying circuits 31 to 34 are connected between input and output transmission circuits 10 and 20 in a forward direction, a bias-T 29 is connected to an output terminal OUT of the...
6466095 Power amplifier  
To provide a variable gain power amplifier with wide dynamic range of transmission power, wherein power efficiency is high, distortion in the linearity is low. In an amplifier with a plurality of...
6433638 Fully balanced transimpedance amplifier for high speed and low voltage applications  
A fully balanced transimpedance amplifier for high speed and low voltage applications is provided. An input stage of the amplifier uses a matched pair of common source connected transistors with...
6429735 High speed output buffer  
An apparatus for an improved output buffer includes a symmetrical pre-gain stage and a gain stage. The pre-gain stage includes a pair of matched differential amplifiers that are arranged to...
6417734 High-frequency amplifier circuit with negative impedance cancellation  
A high-frequency amplifier circuit includes an amplifying transistor and a driver transistor, with the amplifying transistor being connected in either a common emitter or a common source...
6414545 Predistortion to improve linearity of an amplifier  
An amplifier (1) of improved linearity has a predistortion, bipolar junction device (4), and a transistor (2) on an input side of the amplifier (1), the bipolar junction device (4) being smaller...
6407640 Two-stage LNA with good linearity  
A two-stage stacked high IIP3 LNA with low current consumption is presented. Low-impedance bias terminations and optimum inter-stage match are used for IIP3 enhancement. A new graphical design...