Match Document Document Title
6650180 Totem pole rf amplifiers with phase and amplitude correction  
Apparatus (40, 70, and 80) and method are provided for minimizing power losses when combining rf signals in conductors (50A, 50B, 62A, and 62B) that are at quadrature phase angles. The method...
6650185 Frequency selective distributed amplifier  
A frequency selective differential amplifier (400) consistent with certain embodiments of the invention has a plurality of N amplifier stages (401, 402, 403 through 404) that collectively drive...
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...
6630864 Linear variable gain amplifiers  
A system and method of controlling the operation of linear variable-gain amplifiers to allow for such linear variable gain amplifiers to have a wider operating range at high current levels,...
6621347 RF power amplifier  
An RF power amplifier has a pair of power amplifying elements for receiving first and second distributed signals resulting from distribution of an input signal from the outside and having the...
6621374 Splitter/combiner using artificial transmission lines, and paralleled amplifier using same  
A power splitter/divider may be used with a paralleled amplifier. The power splitter/divider includes a common port and a distribution structure for distributing equal-amplitude samples of the...
6617929 Full output matching apparatus of a microwave doherty amplifier  
Quarter wave transformers are connected to final outputs of a carrier amplifier and a peaking amplifier, which are coupled in parallel to each other, so as to induce a Doherty operation of a...
6614308 Multi-stage, high frequency, high power signal amplifier  
A broadband RF signal amplifier includes a plurality of transistors attached to a surface of a pedestal, each transistor having an input and an output. An RF input path electrically connected to...
6614299 Method and system for automated current balance adjustment for parallel combined amplification elements  
A method and system to balance a signal through a plurality of parallel amplifier elements of an amplifier device. An input signal to the amplifier device is divided substantially equally among a...
6597243 Distributed amplifier having a tapered transconductance architecture  
A distributed amplifier having an improved transimpedance and/or gain comprises an input transmission line, the input transmission line forming an input of the distributed amplifier and having a...
6590448 Operational amplifier topology and method  
A technique is disclosed which facilitates the layout of op amp cells, for example, two-stage op amp cells or three-stage op amp cells, to provide larger operational amplifiers. In accordance with...
6591087 Radio communication apparatus  
A radio communication apparatus is provided which is capable of carrying out stable radio communication by preventing the phase rotation at the output end by addition of a phase rotation...
6583672 Method for controlling bias in an active grid array  
The present invention relates to a bias tracking network that manipulates the DC value of the control voltage applied to the active devices in each quasi-optic cell within an array of cells. The...
6577198 Active power splitter with impedance matching  
A single-input/multiple output power splitter having internal feedback circuitry. A separate amplifying circuit, such as a transistor, is used to drive each of the outputs. The transistors may be...
6566956 High frequency power amplifier  
A high frequency power amplifier is provided that prevents loop oscillation at a low frequency caused by a closed loop formed between combined semiconductor devices. Previously, coupled-line...
6567653 Dual-mode communications transmitter  
Power amplifier mode control and an associated switching arrangement permit a wireless communications device, such as a mobile terminal, to advantageously use the same transmitter power amplifier...
6545542 Power amplifier with coupler for cross-coupling amplifiers for reduction of differential frequency component  
A power amplifier that reduces intermodulation distortion generated by the amplifier while reducing the number of parts is provided. A power amplifier comprises a first balun, to which a combined...
6538515 Power amplifier and method of operating a power amplifier having multiple output-power modes  
A power amplifier that operates at a high efficiency over a wide power range. In one embodiment, the power amplifier includes a first circuit having a first transistor including an input terminal...
6529715 Amplifier architecture for multi-carrier wide-band communications  
A methodology is provided for processing carriers in a wireless application whereby the outputs of a multiplicity of modulated RF signal sources are combined into a single RF signal stream, that...
6525610 Dual plane microstrip power amplifier  
A high power microwave amplifier implementation comprised of a conductive substrate defining first and second parallel planar surfaces and an edge surface extending substantially perpendicular to...
6522201 RF amplifier having switched load impedance for back-off power efficiency  
Efficiency of an RF/microwave power amplifier is increased at a back-off power level by increasing the load resistance of the amplifier at the reduced output power level as compared to load...
6522203 Power amplifying transistors  
In an output stage of an electronic signal processing circuit such as that used for transmission from a mobile telephone set the amplifier circuit comprises two power transistors (A, B) or type...
6518839 Method and apparatus for effecting programmable gain amplification  
A programmable gain amplifier (10) has a differential input (12-13), a differential output (16-17), and a plurality of enable inputs (21, 31-34). The amplifier includes a plurality of...
6515545 RF power amplifier transistor quiescent current checking and adjusting  
A power amplifier system is presented for use in amplifying an RF input signal comprising N sub-power amplifiers are connected together in parallel with each receiving and amplifying a portion of...
6498535 High dynamic range low noise amplifier  
A low noise amplifier (82) for use in a wireless telecommunications system. The amplifier (82) includes an amplifying device (90), such as an FET, and a plurality of oscillation stabilization...
6492873 Method of distributed amplifier design utilizing filter synthesis techniques  
The present invention describes the method and system of applying filter synthesis technique to distributed amplifier design. The method for synthesizing a distributed amplifier comprises the...
6489850 Crosstalk suppression in differential AC coupled multichannel IC amplifiers  
A multichannel parallel IC amplifier includes a plurality of amplifier circuits formed on an IC substrate. Each amplifier circuit is coupled to respective inputs via a pair of capacitors. The...
6489848 Linear and multi-sin h transconductance circuits  
The present invention teaches a variety of transconductance circuits formed having two or more class AB transconductor amplifiers coupled in parallel. The class AB transconductor amplifiers have...
6483385 Signal amplification circuit with unequal top and bottom surface areas  
The present invention provides a signal amplification circuit used in a portable communications device. The signal amplification circuit has an input circuit for supplying input signals, an output...
6480179 Image display invention  
An image display device has an image display section including an insulating substrate having a matrix of pixels formed on an inner surface thereof and a liquid crystal layer sandwiched between...
6480465 AM transmitter having feed-forward correction to compensate for source impedance  
An AM transmitter having feed forward correction to compensate for source impedance. A power supply source provides a DC operating voltage. N RF amplifiers are provided for amplifying an input...
6472936 Low-noise gain switching circuit using tapped inductor  
There is disclosed an improved variable gain low-noise amplifier. The variable gain low-noise amplifier comprises: 1) an input transistor having a first ground terminal coupled to ground and an...
6472935 Combining networks for switchable path power amplifiers  
The present invention teaches a power amplifier having two or more output power devices and a combining network for switching the output path between these several power devices. The first output...
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...
6469581 HEMT-HBT doherty microwave amplifier  
A microwave amplifier and more particularly to a microwave amplifier configured as a Doherty amplifier. The amplifier includes a carrier amplifier, a peak amplifier, a Lange coupler at the input...
6452491 Amplifier and heat sink configuration  
An amplifier assembly includes a heat sink and a plurality of amplifier stages, where the total power rating of the amplifier stages is greater than the power rating of the heat sink. The heat...
6448858 Mask layout for sidefed RF power amplifier  
A side fed RF amplifier comprising a plurality of transistors connected in parallel such that the base, emitter, and collector leads of each transistor are electrically connected to the base,...
6448859 High frequency power amplifier having a bipolar transistor  
The object of the present invention is to provide a bipolar transistor which is excellent in uniformity of current distribution in spite of a small ballast resistance, and can constitute an...
6441687 Amplifier bias voltage generating circuit and method  
A novel bias voltage generating circuit and method are disclosed. In one embodiment, the bias voltage generating circuit includes a first transistor with a base terminal coupled to the output node...
6437642 Multiport amplifier with a number of amplifier elements other than 2  
An array of a plurality of amplifiers, where the plurality is a number other than 2N, where N is an integer, is paralleled by the use of an array of hybrids coupled to the input and output ports...
6433640 Methods and apparatus for amplifying a telecommunication signal  
Methods and apparatus (40) of amplifying a telecommunication signal (41) are provided in accordance with the present invention. The apparatus (40) comprises an input transmission line (48)...
6407923 Support and cooling architecture for RF printed circuit boards having multi-pin square post type connectors for RF connectivity  
An ‘orthogonally stacked’ support and cooling architecture for RF signaling circuits includes a plurality of RF amplifier circuit cards mounted on edge-mountable RF printed circuit support and...
6400227 Stepped gain controlled RF driver amplifier in CMOS  
A variable gain amplifier has at least two branches connected in parallel to drive a common output load. Each branch includes at least two FETs in a cascode configuration. A first FET in each...
6400226 Distributed amplifier with improved flatness of frequency characteristic  
FETs 31 to 34 for amplification are connected between an input transmission line 10 and an output transmission line 20. A terminating circuit 29 having a capacitor 292 and a terminating resistor...
6396352 CMOS power amplifier for driving low impedance loads  
The two-stage power amplifier includes: a first stage transconductor 60; and a second stage having at least two parallel output branches 57-59 supplying current to an output node 89, each output...
6388528 MMIC folded power amplifier  
A MMIC power amplifier having a smaller die size and higher power output are realized with the improved amplifier and transistor geometry herein provided. In particular, transistors, such as FETs...
6388512 Process for a high efficiency Class D microwave power amplifier operating in the S-Band  
A process and product providing a High Efficiency Microwave Power Amplifier (HEMPA) which propagates S-Band microwave frequency square waves; utilizing a program simulating FETs at high DC-to-RF...
6384680 RF amplifier with plural combiners  
The present invention aims to provide a RF amplifier capable of controlling the generation of spurious signals when plural carriers are simultaneously amplified. The RF amplifier includes dividers...
6380777 Output driver having controlled slew rate  
An off chip driver circuit is adapted to output differential output signals at high speed rate and capable to drive high external loads without degradation of the output signals. Specifically the...
6377125 Distributed amplifier having separately biased sections  
A distributed amplifier (40) and a method (100) of operating the distributed amplifier (40) are provided in accordance with the present invention. The distributed amplifier (40) comprises an input...