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Class Information
Number: 330/195
Name: Amplifiers > Output networks > Transformer coupled
Description: Subject matter in which the output circuit network includes a transformer for coupling the signal from the amplifier device to the load.

Sub-classes under this class:

Class Number Class Name Patents
330/196 With additional impedance connected to "p" or "s" circuit 11
330/197 With transformer structure 7

Patents under this class:
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Patent Number Title Of Patent Date Issued
8687369 Apparatus for creating resistive pathways Apr. 1, 2014
8666340 Method and system for on-chip impedance control to impedance match a configurable front end Mar. 4, 2014
8604874 Enhanced transformer output demultiplexing method (ETODEM) Dec. 10, 2013
8508301 Three dimensional inductor, transformer and radio frequency amplifier Aug. 13, 2013
8502598 Digitally-scalable transformer combining power amplifier Aug. 6, 2013
8446217 Dual-loop feedback amplifying circuit May. 21, 2013
8384484 Power amplifier with improved bandwidth Feb. 26, 2013
8378744 Multi-mode power amplifier Feb. 19, 2013
8362835 Decade bandwidth planar MMIC four port transformer Jan. 29, 2013
8253486 Wireless apparatus having shielding function Aug. 28, 2012
8188788 Systems and methods for a discrete resizing of power devices with concurrent power combining structure for radio frequency power amplifier May. 29, 2012
8174315 Method and circuit for transforming the impedance of a load May. 8, 2012
8174323 High frequency amplifier May. 8, 2012
8154344 RF power amplifier Apr. 10, 2012
8115555 Balun function with reference enhancement in single-ended port Feb. 14, 2012
8116700 Reducing common mode effects in an output stage Feb. 14, 2012
8098095 Power amplifier Jan. 17, 2012
8093950 Power amplifier having transformer Jan. 10, 2012
8044540 Systems and methods for a SPDT switch or SPMT switch with transformer Oct. 25, 2011
8026765 Audio frequency amplifier Sep. 27, 2011
7944296 Low power mode amplification with a transformer output matching and a virtual ground May. 17, 2011
7936215 Multi-segment primary and multi-turn secondary transformer for power amplifier systems May. 3, 2011
7880547 Systems and methods for power amplifiers with voltage boosting multi-primary transformers Feb. 1, 2011
7872529 Switch method for switching class amplifiers Jan. 18, 2011
7834686 Power amplifier Nov. 16, 2010
7812671 Transformer and structure thereof and power amplifier Oct. 12, 2010
7808316 Wideband differential amplifier including single-ended amplifiers coupled to a four-port transformer Oct. 5, 2010
7768350 Output gain stage for a power amplifier Aug. 3, 2010
7728661 Controlling power with an output network Jun. 1, 2010
7675365 Systems and methods for power amplifiers with voltage boosting multi-primary transformers Mar. 9, 2010
7592865 Power amplifier using power combiner Sep. 22, 2009
7592866 Widebrand differential amplifier including single-ended amplifiers coupled to a four-port transformer Sep. 22, 2009
7576607 Multi-segment primary and multi-turn secondary transformer for power amplifier systems Aug. 18, 2009
7564304 Audio power amplifier apparatus Jul. 21, 2009
7557655 Systems and methods for isolating an analog signal Jul. 7, 2009
7486137 System and method for power amplifier output power control Feb. 3, 2009
7477105 Amplifier arrangement and method for amplifying a signal Jan. 13, 2009
7397305 High output power amplifier with adjustable voltage transformation ratio of transformer Jul. 8, 2008
7365602 Multilevel power amplifier architecture using multi-tap transformer Apr. 29, 2008
7348845 System and method for employing variable magnetic flux bias in an amplifier Mar. 25, 2008
7288989 Low-noise amplifier with a transformer Oct. 30, 2007
7224231 Method for transforming output signals of a low-noise amplifier of a wireless transceiver May. 29, 2007
7210162 DVB-ASI signal inverting adapter and system Apr. 24, 2007
7129784 Multilevel power amplifier architecture using multi-tap transformer Oct. 31, 2006
7113056 Radial power divider/combiner Sep. 26, 2006
6992543 Mems-tuned high power, high efficiency, wide bandwidth power amplifier Jan. 31, 2006
6867646 Demodulation apparatus for digital audio amplifier Mar. 15, 2005
6754338 Bidirectional loss/slope equalizer arrangement Jun. 22, 2004
6737916 RF amplifier system having improved power supply May. 18, 2004
6639467 Alternating current derived from direct current Oct. 28, 2003

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