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Class 330/195 - Transformer coupled


Subclass of Class 330 - Amplifiers
Definition: Subject matter in which the output circuit network includes
No. of patents: 46
Last issue date: 05/08/2012


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NumberTitleIssue Date
8174315Method and circuit for transforming the impedance of a load
According to an embodiment, a method is provided that includes: adapting the impedance of the load dependent on working conditions of the active device using a controllable output-side adaptation network coupled between an output-side terminal of a transformer and a...
05/08/2012
8098095Power amplifier
Disclosed herein is a power amplifier. The power amplifier includes N power amplification means, a transformer, and a harmonic elimination unit. Each of the N power amplification means amplifies an input signal into a predetermined level. The transformer includes N/...
01/17/2012
8093950Power amplifier having transformer
A power amplifier amplifying and compositing differential signals and capable of suppressing harmonics is provided. The power amplifier includes first amplifiers amplifying a first input signal and a second input signal, which are differential signals, a first coil ...
01/10/2012
8026765Audio frequency amplifier
An amplifier is operable in push-pull mode, single-ended mode, or a composite mode that is an intermediate between single-ended and Push-pull modes. Moreover, at least one output device may be configured to operate using a high performance AC servo loop that functio...
09/27/2011
7944296Low power mode amplification with a transformer output matching and a virtual ground
A power amplifier system in accordance with an example embodiment can utilize a transformer having a primary winding inductively coupled to a secondary winding, where the primary winding includes a center tap between a first port and a second port, where the seconda...
05/17/2011
7936215Multi-segment primary and multi-turn secondary transformer for power amplifier systems
Embodiments of the invention may provide for power amplifier systems and methods. The systems and methods may include a power amplifier that generates a first differential output signal and a second differential output signal, a primary winding comprised of a plural...
05/03/2011
7872529Switch method for switching class amplifiers
In accordance with one the present disclosure, systems and methods are disclosed that include transmitting a binary signal from a signal source into a switch where the switch is in series between the signal source and a first circuit element. In addition, the switch...
01/18/2011
7808316Wideband differential amplifier including single-ended amplifiers coupled to a four-port transformer
A differential amplifier is formed from a first single-ended amplifier circuit, a second single-ended amplifier circuit, and a four-port transformer circuit coupled to the first and second single-ended amplifier circuits to form the differential amplifier. ...
10/05/2010
7592866Widebrand differential amplifier including single-ended amplifiers coupled to a four-port transformer
A differential amplifier is formed from a first single-ended amplifier circuit, a second single-ended amplifier circuit, and a four-port transformer circuit coupled to the first and second single-ended amplifier circuits to form the differential amplifier. ...
09/22/2009
7576607Multi-segment primary and multi-turn secondary transformer for power amplifier systems
Embodiments of the invention may provide for power amplifier systems and methods. The systems and methods may include a power amplifier that generates a first differential output signal and a second differential output signal, a primary winding comprised of a plural...
08/18/2009
7557655Systems and methods for isolating an analog signal
An accurate linear equivalent of an analog signal may be produced across an isolation barrier by driving a primary transformer winding with a drive amplifier and compensation amplifier, where the compensation operational amplifier amplifies a difference between a si...
07/07/2009
7397305High output power amplifier with adjustable voltage transformation ratio of transformer
A high output power amplifier with change of voltage transformation ratio of a transformer is disclosed. The high output power amplifier using a transformer installed to output leads thereof, which can increase dynamic range and efficiency thereof as voltage transfo...
07/08/2008
7365602Multilevel power amplifier architecture using multi-tap transformer
A multi-level power amplifier architecture using a multi-tap transformer implemented on a single CMOS integrated circuit wireless communications device is described. By providing a multi-tap transformer for coupling a plurality of power amplifiers to a shared output...
04/29/2008
7348845System and method for employing variable magnetic flux bias in an amplifier
A system and method for employing variable magnetic flux bias in an amplifier. The amplifier system comprises an output transformer and a magnetic sensor configured to sense a first magnetic flux of the output transformer. The magnetic sensor generates a flux signal...
03/25/2008
7288989Low-noise amplifier with a transformer
An amplifier circuit includes a transistor having a control terminal, a first and a second terminal, a signal input terminal coupled to the control terminal of the transistor, as well as a transformer with a primary side and a secondary side, the primary side of whi...
10/30/2007
7224231Method for transforming output signals of a low-noise amplifier of a wireless transceiver
A method for transforming single-ended signals outputted from a low-noise amplifier of a wireless transceiver into differential signals. The method includes: providing a transformer according to a default requirement of the wireless transceiver; transferring the sin...
05/29/2007
7210162DVB-ASI signal inverting adapter and system
An inverting adapter is disclosed that inverts inverted DVB-ASI signals to produce an adapted DVB-ASI signal. This adapted DVB-ASI signal may be used by any DVB-ASI device. The inverting adapter can be contained in one small package and easily connected to any of th...
04/24/2007
7129784Multilevel power amplifier architecture using multi-tap transformer
A multi-level power amplifier architecture using a multi-tap transformer implemented on a single CMOS integrated circuit wireless communications device is described. By providing a multi-tap transformer for coupling a plurality of power amplifiers to a shared output...
10/31/2006
7127133Monolithically integrated optic triplexer and method for making same
A monolithically integrated optic triplexer is described herein that can be mounted in one transistor outline (TO) can and can be used in a passive optical network. The monolithically integrated optic triplexer includes: an emitting laser; at least a first photodiod...
10/24/2006
7113056Radial power divider/combiner
A radial power divider-combiner is disclosed. The divider-combiner includes a divider and a combiner. An input signal is provided to a transmission antenna that radiates the input signal inside the divider. Within the divider, the input signal is divided into a plur...
09/26/2006
6992543Mems-tuned high power, high efficiency, wide bandwidth power amplifier
A circuit for matching the impedance of an output load to an active device includes a transformer including a first winding having a terminal for coupling to the output of the active device and a second winding electromagnetically coupled to the first winding, and a...
01/31/2006
6867646Demodulation apparatus for digital audio amplifier
Disclosed is a demodulation apparatus for a digital audio amplifier capable of solving a space, cost and heat generation of the digital audio amplifier. The demodulation apparatus includes a first inductor connected between a positive digital audio signal output ter...
03/15/2005
6754338Bidirectional loss/slope equalizer arrangement
A bidirectional equalizer arrangement for cancelling the effect of residual capacitance and/or residual resistive loss in a separation filter having a low-pass filter and a high-pass filter. The equalizer comprises a differential amplifier whose input forms the equa...
06/22/2004
6737916RF amplifier system having improved power supply
An RF amplifier system having improved power supply is presented and which includes a plurality of power amplifiers each having an output circuit for connecting a DC voltage source to one of a plurality of primary windings located on a first transformer. The first t...
05/18/2004
6639467Alternating current derived from direct current
Continuous alternating current is derived from a differential operational amplifier supplied by direct current. The differential operational amplifier produces alternating current located on the positive input of the differential operational amplifier. Ou...
10/28/2003
6566947Combined active impedance and filter in line drivers
A line driver combining active impedance and filter in one stage for connection to a transmission line having a characteristic impedance. The line driver comprises an amplifier, a transformer with a primary to secondary winding ratio of 1:n, a reference i...
05/20/2003
6300828Switchless high efficiency amplifier
A high potential/high efficiency amplifier contains at least two separate amplifiers. One amplifier is used for the typical inputs that are received from an input source and a second amplifier is used solely for peak inputs. Utilizing the second amplifier...
10/09/2001
6229396Controlled impedance transformer line driver
A pair of equivalent controlled impedance buffers are connected in a push-pull configuration to the primary coil of a transformer. A pair of equivalent pre-drivers are connected to the pair of buffers. Each pre-driver receives a driver input signal and ou...
05/08/2001
6175271Output signal converter for tube amplifiers
The output signal converter for a tube amplifier includes semiconductor devices for amplifying or attenuating an output signal of the tube amplifier while maintaining output properties of the tube amplifier. The output signal converter in preferred embodi...
01/16/2001
5541482Electrodeless discharge lamp including impedance matching and filter network
An impedance matching and filter network is disclosed. The network performs two preselected impedance transformations and provides a filtering function to attenuate harmonics of an electrical signal delivered at an input of the network. The network may ad...
07/30/1996
5091703Analog line connection
An analog line connection circuit provides that the transmission voltage is not superimposed on the received voltage given a data transmission in duplex operation via a two-wire line. The line connection circuit is provided with an amplifier that comprise...
02/25/1992
5077756Data network line driver
A line driver for a cable linked LAN maintains a high impedance across the cable when not sending data. A pulse transformer includes a primary and secondary winding. The primary winding of the transformer is placed between a first pair of transistors and ...
12/31/1991
5049837Push-pull transformer coupled RF amplifier with response to DC
A transformer-based coupling network permits a push-pull amplifier to be used with single ended signals, while providing constant gain and, if desired, bidirectional impedance matching, from RF down to DC....
09/17/1991
4829273Surface acoustic wave filter
A frequency characteristic of a surface acoustic wave filter having at least a first transducer and a second transducer is determined by a product of a frequency amplitude characteristic of the first transducer and that of the second transducer so that th...
05/09/1989
4774477Power amplifier having low intermodulation distortion
Intermodulation distortion in RF FET amplifiers operating in the Class AB mode is reduced without limiting the bandwidth by providing transformer coupled outputs from both the source and drain circuits. The negative feedback provided by the transformer in...
09/27/1988
4772870Power line communication system
A low-level, low-power radio frequency (RF) communications system designed to operate as a point-to-point power line communications sytem (PLC) utilizing frequencies from 50 to 600 MegaHertz (MHz) superimposed onto the AC power signal in a building....
09/20/1988
4633191Transformer isolated high voltage, high power amplifier system
A transformer isolated high voltage, high power system is disclosed which is suitable for driving servo motors in servo loop control systems or the like. A D.C. current control loop is provided for preventing transformer saturation without gapping the tra...
12/30/1986
4614914Low-distortion transformer-coupled circuit
A low-distortion transformer-coupled circuit. An amplifier is constructed to have a negative output impedance equal to the resistance of the primary winding of a coupling transformer to which the amplifier is connected thereby cancelling the distortion co...
09/30/1986
4606046Converter/line driver circuit for a line repeater
A converter circuit receives N-rail logic signals and converts them into a precision N-level signal. A pair of line drivers is connected in a balanced output arrangement with the primary winding of an output transformer. In response to the N-rail logic si...
08/12/1986
4208633Current supply branching arrangement for separation of signal and supply currents
A current branching circuit for an amplifier for first and second input terminals and a current supply feed terminal comprising a pair of magnetically coupled windings with one of the windings connected between the center conductor of a coaxial feed line ...
06/17/1980
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