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7106806 Reducing distortion of signals  
A predistorter (26) comprises an array (44) of band pass filters (46 to 52) which divide an input signal into components. Each of the components is manipulated using coefficients retrieved from...
7106130 Variable frequency PWM controller circuit  
The present invention discloses a circuit that generates a variable frequency pulse width modulation (VF PWM) signal. Different from the conventional PWM controller, the frequency and duty cycle...
7102444 Method and apparatus for compensating and improving efficiency in a variable power amplifier  
A method and apparatus for an amplifier, such as a radio frequency amplifier embodiment as an integrated circuit is disclosed. Embodiments provide for operating with good energy efficiency at...
7102443 Temperature-stabilized amplifier circuit  
A circuit for amplifying an input voltage (VIN) into an output voltage (VOUT) with an overall gain factor, which is a product of a first gain factor (S) and a second gain factor (R1), comprises...
7098740 Radio frequency power amplifier and communication system  
There is provided not only a radio frequency power amplifier using an SiGe HBT subject to a little amplification distortion, but also a communication system using the same. A conventional radio...
7095283 Supply circuit for power amplifier drivers  
An integrated power combiner is disclosed. The power combiner includes a first circular geometry primary winding having one or more inductive elements, such as an active winding with one or more...
7081794 Paralleling digital-input amplifiers  
Two or more digital-input RF amplifiers are configured in parallel such that a combiner combines their respective outputs to generate a relatively large composite RF output signal. A feedback...
7078976 High power Doherty amplifier  
A high power Doherty amplifier circuit having at least one input terminal and at least one output terminal comprising at least one carrier transistor (30) forming a main amplifier stage; at least...
7072626 Polar modulation transmitter  
A polar modulation transmitter circuit provides reduced ACPR in its output signal by controlling the relative delay between its envelope and phase modulation operations based on direct or indirect...
7071775 Method and apparatus for an enhanced efficiency power amplifier  
A power amplifier that includes: an input drive controller (310) for receiving an input signal (312) and for generating from the input signal at least a first drive signal (314), a second drive...
7071774 Composite amplifier  
A composite amplifier includes a first and a second power amplifier connected to a Chireix output network. A signal component separator and an IQ separator provide equal first and linear drive...
7064606 High efficiency amplifier and method of designing same  
An amplifier includes a main amplifier circuit and at least one auxiliary amplifier circuit. Portions of an RF signal to be amplified are delivered to the main and auxiliary amplifiers. The...
7061329 Semiconductor device having balanced circuit for use in high frequency band  
A semiconductor chip for amplification is connected between input-side and output-side matching circuits, and each of matching circuits includes balanced circuits which receive signals different...
7057463 Differential amplifier with improved frequency characteristic  
An amplifier for amplifying an input signal, having a plurality of amplifier stages each having a gain smaller than a target gain. The plurality of amplifier stages are connected in parallel and...
7057458 Balanced power amplifier and high-frequency communication apparatus  
A balanced power amplifier includes grounded-emitter first and second bipolar transistors that are disposed in parallel, first and second variable impedance elements with each one end being...
7053700 High-efficiency amplifier and method  
Methods and apparatus are provided for efficiently amplifying a signal. An input signal is decomposed into a plurality of two state signals, each two state signal having a respective on level and...
7043033 Mode control for audio amplifier coupling  
An audio amplifier system includes two amplifiers that are configured to drive loads through either DC or AC coupling. A third amplifier provides an AC ground return when the system is configured...
7038542 Variable gain amplifier  
A variable gain amplifier includes a first constant current amplifier configured to generate a reference current from an input signal. A controller is configured to generate a bias current and a...
7034619 Monolithic array amplifier with periodic bias-line bypassing structure and method  
A bias-line bypassing structure comprises a plurality of bias-line bypass circuits forming a periodic structure at least partially around each of a plurality of amplification units to reduce RF...
7030698 High-frequency power amplifier  
In a high-frequency power amplifier, gate feed portions are formed by dividing a gate feed which connects transistor gate electrodes in parallel, and each of the gate feed portions includes a...
7015761 Power amplifier module  
A CDMA system is provided which includes a power amplifier module have a DC current amplifier. The DC and current amplifier detects a DC component of an input signal and amplifies this detected DC...
7009454 Method and apparatus for optimization of amplifier with adjustable output range  
A method and apparatus for an amplifier, such as a radio frequency amplifier embodied as an integrated circuit is disclosed. Embodiments provide for a wide range of operating powers with good...
6993286 Dual band bidirectional amplifier for wireless communication  
The dual band bi-directional amplifier has only one amplifier chain having an uplink amplifier and a downlink amplifier, but can nonetheless amplify signals from two frequency bands in both an...
6993302 Class-L power-output amplifier  
A radio power output amplifier comprises a balanced radio power output that differentially drives a dipole antenna or other balanced load. One half of the differential power output drives one side...
6980057 Power amplifier, power distributor, and power combiner  
In a power amplifier of the present invention, distributed constant lines 105a and 105b have a total line length corresponding to a ½ wavelength of a fundamental wave so as to invert the phase of...
6970040 Multi-mode/multi-band power amplifier  
The present invention provides a wideband power amplifier for a multi-mode or multi-band wireless communication device. The wideband power amplifier is configured to amplify signals in different...
6970039 Efficiency enhancement for MMIC amplifiers  
The present innovation is directed to a single-chip integrated circuit power amplifier configured to employ the efficiency enhancement techniques utilized in Doherty amplifiers. The single-chip...
6965269 Microwave phase shifter having an active layer under the phase shifting line and power amplifier using such a phase shifter  
A phase shifter according to this invention includes a circuit board having a semi-insulating layer. An active layer is formed in a transmission line forming portion on one surface side of the...
6965722 High efficiency active matching electro-optic transducer driver circuit operable with low supply voltages  
An optical transmitter and/or a constituent electro-optic transducer driver that performs active matching. The transducer driver performs active matching using a voltage step down through one...
6960959 Power amplifier and communication apparatus  
A power amplifier of amplifying signals of two frequency bands is reduced in size and improved in efficiency at low output. The power amplifier includes an input terminal, a branch circuit and so...
6943621 Auto-routable, configurable, daisy chainable data acquisition system  
A method and apparatus for an acquisition system includes a plurality of sensor input signal lines. At least one of the plurality of sensor input signal lines operatively connects to at least one...
6940349 Transmitter including a composite amplifier  
A composite amplifier includes a main power amplifier (10) and an auxiliary power amplifier (12), which are connected to a load (14) over a Doherty output network (16). A non-linear function (18)...
6940350 Amplifier and method for canceling nonlinearity in amplifier  
An amplifier including an amplifier transistor that operates in an active region has main current flowing therethrough according to input voltage, and a linear transistor that is driven by offset...
6940354 Microwave power amplifier  
A microwave power amplifier comprising a drive amplifying stage includes power elements, gate and drain bias circuits of the power elements, a RC parallel circuit connected between input port and...
6930556 Active-loop, spatially-combined amplifier  
A system for amplifying a signal is provided. The system includes a wave guide and an active loop amplifier disposed in the wave guide. The active loop amplifier receives the signal and generates...
6930557 Multi-stage amplifier  
A multi-stage amplifier includes first and second amplifier stages, and first and second capacitors. The first amplifier stage includes a input line having a first input end and a second input...
6927625 High frequency circuit using high output amplifier cell block and low output amplifier cell block  
A high frequency circuit capable of realizing a power amplifier with a wide dynamic range in which it is hard to degrade the power addition efficiency at low output is formed by using a high...
6922106 Divided-voltage FET power amplifiers  
Divided-voltage FET amplifiers (10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 130, 140, 150, 160, 170, 180, 200, or 220) include two or more solid-state current devices, preferably gallium...
6922102 High efficiency amplifier  
An amplifier includes a main amplifier circuit and at least one auxiliary amplifier circuit. Portions of an RF signal to be amplified are delivered to the main and auxiliary amplifiers. The...
6917246 Doherty bias circuit to dynamically compensate for process and environmental variations  
The invention includes a Doherty power amplifier system having a Doherty power amplifier electrically connected to a Doherty bias circuit. The Doherty amplifier includes a carrier amplifier and...
6909324 High-efficiency solid state power amplifier  
A high-efficiency solid state power amplifier (SSPA) for specific use in a spacecraft is provided. The SSPA has a mass of less than 850 g and includes two different X-band power amplifier...
6900695 Reconfigurable broadband active power splitter ditto power combiner and ditto bidirectional power splitter/power combiner and circuits based on these  
A distribution network which can be an active power splitter or an active power combiner or alternatingly power splitter and such a power combiner. The power splitter consists of two distributed...
6900696 Shared-current electronic systems  
Shared-current electronic systems (10, 20, 26, 30, 38, 48, 66, 70, 82, 90, 96, 100, 104, 108, 118, and 122) include two or more solid-state electronic devices, such as a solid-state amplifying...
6894562 High-frequency amplifier, feed-forward amplifier and distortion compensating amplifier  
A divider 3 for dividing and distributing a high-frequency signal input from an input terminal 1 to two output sides, a main amplifying unit 4, connected to one output side of the divider 3, for...
6894566 Active load device that enables biasing of a very wide band distributed amplifier circuit with gain control  
The invention relates to a very wide band amplifier circuit including a distributed amplification cell (100) connected to a biasing cell (200), the amplification cell (100) including several...
6876254 Dual amplifier circuit and TFT display driving circuit using the same  
A method for controlling a dual-amplifier circuit, including the steps of providing an input terminal and an output terminals; providing first and second amplifiers coupled in parallel between the...
6861906 High-frequency semiconductor device  
A high-frequency semiconductor device according to the present invention achieves improvements in degradation of noise characteristics and a reduction in gain, and an improvement in reduction in...
6853245 Doherty amplifier  
A microwave Doherty amplifier employs a way-extension in which N ways (N≧2, N is a natural number) are established, and envelope tracking for high efficiency and linearity of the power amplifier...
6847258 Power amplifier, power amplifying method and radio communication apparatus  
It is difficult that the impedance of the circuit part on the output side of an amplifying element at the frequency of a modulating wave is lower, and consequently, it is difficult to more...
6844783 Radio frequency monolithic power amplifier layout techniques  
Radio frequency monolithic power amplifier layout techniques for the purpose of the invention is for improved thermal and electrical performance of RF monolithic power amplifiers. The inventive...