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6838941 Multi-band power amplifier  
A final-stage power amplification transistor is formed of unit transistors arranged in a mixed manner in a region in which the final output amplification transistors for a multi-band power...
6831511 Distortion cancellation for RF amplifiers using complementary biasing circuitry  
An apparatus for improving linearity of an RF signal comprising: (a) a splitter configured to receive an input RF signal, and configured to split the input RF signal into two RF signals comprising...
6828861 Power amplifier with distributed capacitor  
A power amplifier integrated circuit includes a plurality ofheterojunction bipolar transistors having a plurality of bases, a plurality of ballast resistors, and a capacitor. Each ballast resistor...
6828875 Compact slotted-waveguide spatial power divider/combiner/amplifier  
A spatial power divider/combiner that comprises: a housing containing a first channel forming three sides of a rectangular input waveguide and a second channel forming three sides of a rectangular...
6822516 High speed high gain amplifier  
An electronic device is provided such as an amplifier, for example, having improved gain and transconductance and low output impedance. The device includes a primary amplifier configured to carry...
6822522 Method and apparatus for an improved nonlinear oscillator  
A nonlinear oscillator method and apparatus. According to one embodiment, a nonlinear oscillator is closed. The nonlinear oscillator includes a first linear amplifier, a second linear amplifier...
6819171 Amplifier arrangement  
Limiting amplifier (116) removes amplitude variations from the input signal (110). Splitter (120) provides the constant amplitude signal to each of amplifiers (124A to 124H) via a respective...
6819184 RF transistor amplifier linearity using suppressed third order transconductance  
The linearity of a transistor amplifier comprising a plurality of transistors operating parallel is improved by reducing the odd order transconductance derivatives of signals generated by the...
6819181 Method and structure for integrated circuit interference isolation enhancement  
A structure and method for the improvement of interference isolation using distributed broadband technology. This structure uses signal processing across a distributed network in order to optimize...
6819176 High power, wide bandwidth operational amplifier  
A high bandwidth operational amplifier architecture has three control loops, which are combined via a voltage-follower-configured field effect transistor. The first control loop is an...
6816015 Amplifier circuit having a plurality of first and second base resistors  
An improved bipolar transistor power amplifier circuit including a bias input node, an RF input node, an RF output node, and a plurality of HBTs. Each HBT includes a base, an emitter, a collector,...
6816016 High-efficiency modulating RF amplifier  
The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., bard-limiting or switch-mode) power amplifier in such a manner as to achieve a...
6809594 Ultra broadband low noise amplifier with matched reactive input impedance  
A low noise amplifier (LNA) for amplifying an input signal communicated over a transmission line having an impedance. The LNA includes a current sensing amplifier having an input to connect to the...
6806772 Power transistor array temperature control system  
A method and apparatus for use with a transistor array for enhancing the array's performance and/or reliability and/or longevity by sensing the temperature of each transistor in the array and...
6803837 Power splitter/combiner circuit, high power amplifier and balun circuit  
A balun design incorporating the functions of a splitter (combiner) which can be employed in a high power amplifier circuit configuration. The balun is formed of a dielectric multilayer board with...
6799020 Parallel amplifier architecture using digital phase control techniques  
An improved method and apparatus for using parallel amplifiers to efficiently amplify an information signal are disclosed. The improved apparatus utilizes digital signal manipulation techniques in...
6798294 Amplifier with multiple inputs  
A low noise amplifier (500) is provided for amplifying signals in a frequency band. The low noise amplifier (500) comprises several amplifying elements (505, 506) that share a load impedance (503)...
6798295 Single package multi-chip RF power amplifier  
Disclosed are a multi-chip power amplifier comprising a plurality chips with each chip being a transistor amplifier, and a housing in which all of the semiconductor chips are mounted. A plurality...
6791417 N-way RF power amplifier circuit with increased back-off capability and power added efficiency using selected phase lengths and output impedances  
An RF power amplifier circuit for amplifying an RF signal over a broad range of power with improved efficiency includes a carrier amplifier for amplifying an RF signal over a first range of power...
6788148 Voltage-limited distributed current source for ultra-broadband impedance termination  
A termination network simultaneously provides a voltage-limited output direct current (dc) bias and termination of a broadband distributed amplifier operating down to an arbitrary low frequency....
6784747 Amplifier circuit  
An amplifier circuit and fabrication method including a bias input node, an RF input node, an RF output node, and a plurality of amplifier cells. Each cell has a plurality of discrete emitter...
6781459 Circuit for improved differential amplifier and other applications  
Differential amplifiers and phase-splitting circuits incorporate voltage-transfer or current-transfer devices of different conductivity types that are connected in series between two different...
6781467 High linearity low noise amplifier  
A feedforward nonlinearity cancellation scheme is used to improve the linearity of a low noise amplifier (LNA). An LNA incorporates a main amplifier and an auxiliary amplifier couple to receive...
6778036 High-frequency circuit device having isolator ports each having two terminals  
A high-frequency circuit device includes a distribution circuit (16) for distributing a signal inputted from a signal input terminal (20) to a plurality of first lines (16b) through a branch...
6778015 Distributed amplifier  
A distributed amplifier having a plurality of cascode amplifying circuits, and which causes little deterioration of the output waveform. In a preferred embodiment, the source potentials of the...
6774720 Electric field intensity detecting circuit and limiter amplifier  
A second differential amplifier (12) is additionally disposed in parallel with at least a part of first differential amplifiers (11) in respect to a differential amplifying circuit comprising a...
6771123 Multichannel power amplifying  
A multichannel electrical power amplifying system constructed and arranged to distribute electrical power of amount P to a total load coupled thereto. The system includes a plurality n of power...
6768381 Semiconductor power amplifier and multistage monolithic integrated circuit  
There are disclosed a semiconductor power amplifier and a microwave monolithic integrated circuit which can be reduced in size and cost and which can sufficiently inhibit loop oscillation. The...
6759907 Distributed level-shifting network for cascading broadband amplifiers  
A distributed and adjustable level-shifting network is integrated with cascaded amplifiers, eliminating the need for a direct current (dc) blocking capacitor between the amplifiers. The...
6750707 Multi-carrier RF amplifiers  
Apparatus including input ports for inputting a plurality of input signals different in frequency of carrier from one another, dividers for respectively dividing each of the plurality of input...
6750721 HBT linearizer and power booster  
A power amplifier incorporates base ballasted hetero-junction bipolar transistors (HBTs) in parallel. A transistor pair adjusts the voltage applied to the base ballast if it senses that the...
6747517 Power-shifting rf amplifiers  
Apparatus (70, 80, 90) and method are provided for selectively proportioning, or hot-switching, rf power to a plurality of rf outputs. The method includes: splitting a single rf signal into a...
6735421 Receiver including low noise amplifier and frequency down-converter for a wireless telecommunication system  
A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received...
6734730 Variable gain amplifier  
In order to provide a high sensitivity variable gain amplifier, there is provided a structure in which at least one path comprising at least a stage of the voltage-input/voltage-output amplifier+...
6731172 Doherty power amplifier with integrated quarter wave transformer/combiner circuit  
A Doherty amplifier system including a quarter wave transformer/combiner circuit which may be implemented as a low cost radio frequency integrated circuit, thereby absorbing and minimizing the...
6727761 Resonant bypassed base ballast circuit  
Base ballast resistors used to control thermal runaway are each bypassed with a series-resonant inductor and capacitor pair. In some embodiments each inductor and capacitor pair is unique. In...
6727762 Direct coupled distributed amplifier  
An apparatus comprising an input stage, an output stage, a bias circuit and a feedback circuit. The input stage may be configured to generate a plurality of intermediate signals in response to an...
6724261 Active radio frequency cavity amplifier  
An active radio frequency cavity amplifier (ARFCA) is provided having a housing defining an input cavity and an output cavity; a plurality of transistors mounted to said housing, each of the...
6714068 Circuit configuration with selectively operating amplifiers  
A circuit configuration is configured such that selectively a first amplifier or a second amplifier amplifies signals. The second amplifier is operated depending on the conditions established at...
6710650 Amplifier switching  
A low noise amplifier (LNA) in a LNA arrangement is selectively bypassed, without detracting from the performance of the LNA arrangement when it is not bypassed, by selecting components of an...
6710662 Power amplifier with improved linearity and reduced transistor stacks  
A power amplifier includes drains and sources of a plurality of transistors connected to each other to produce a plurality of common drains and a plurality of common sources, wherein the common...
6700444 N-way RF power amplifier with increased backoff power and power added efficiency  
An RF power amplifier for amplifying an RF signal over a broad range of power with improved efficiency includes a main amplifier for amplifying an RF signal over a first range of power and with a...
6690238 Variable phase-shifting rf power amplifiers  
Variable phase-shifting rf power amplifiers (10, 30, 50) shift rf outputs at any angle up to 90, 180, or 270 degrees, respectively, while maintaining an rf output substantially constant. The...
6674323 High frequency power amplifier, high frequency power amplifier module, and portable telephone  
To provide a small-sized high frequency power amplifier for preventing oscillation by a small number of switching circuits and outputting high power and low power with high efficiencies, a high...
6674329 Distributed RF amplifier with filtered dummy load  
A distributed amplifier consistent with certain embodiments of the present invention has a plurality of amplifier sections 1 through N (302, 306) with each amplifier section having an input and an...
6667659 High efficiency amplifier  
A distributed amplifier arrangement (300) is provided in which a plurality of input signals (S1(t), . . . SN(t)) are separately controlled by a drive generator circuit (315) to produce modulation...
6661284 Method and apparatus for error compensation in a hybrid matrix amplification system  
A base station subsystem includes at least one transmit branch having a forward path that includes a signal processing unit coupled at an input to an input Fourier Transform Matrix (FTM) and at an...
6662018 Analog power control system for a multi-carrier transmitter  
A power control system for a multi-carrier base station transmitter is capable of controlling power levels of individual RF carriers. The power control system has a multi-channel amplification...
6657497 Asymmetric, voltage optimized, wideband common-gate bi-directional MMIC amplifier  
A bi-directional amplifier (10) for a transceiver module for amplifying both transmit signals and receive signals propagating in opposite directions. The amplifier (10) includes first and second...
6653905 Amplifier for FM antennas  
An amplifier comprising a transformer and a plurality of FETs, for example, three FETs. An input terminal, which receives a signal from an FM antenna, is connected to one end of the primary...