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Class Information
Number: 330/165
Name: Amplifiers > Interstage coupling > Transformer coupling
Description: Subject matter wherein the the signal coupling between the two cascaded amplifying device stages is by means of at least one transformer.

Sub-classes under this class:

Class Number Class Name Patents
330/168 From cathode 0
330/167 With additional impedance connected to "p" or "s" circuits 8
330/166 With additional reactive coupling 7
330/169 With means for adjusting inductive coupling 3
330/170 With shielding 2
330/171 With transformer structure 13

Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8674764 High-frequency power amplifying device Mar. 18, 2014
8654867 Transformer power combiner with filter response Feb. 18, 2014
8421460 Upconverter Apr. 16, 2013
8421461 Upconverter Apr. 16, 2013
8415951 Upconverter Apr. 9, 2013
8362835 Decade bandwidth planar MMIC four port transformer Jan. 29, 2013
8264276 Low-noise amplifier Sep. 11, 2012
8183919 Power amplifier May. 22, 2012
8174315 Method and circuit for transforming the impedance of a load May. 8, 2012
8125276 Sharing of inductor interstage matching in parallel amplification system for wireless communication systems Feb. 28, 2012
8022762 Multi-stage CMOS power amplifier Sep. 20, 2011
8022776 Origami cascaded topology for analog and mixed-signal applications Sep. 20, 2011
7936215 Multi-segment primary and multi-turn secondary transformer for power amplifier systems May. 3, 2011
7872528 Providing pre-distortion to an input signal Jan. 18, 2011
7863986 Techniques for improving balun loaded-Q Jan. 4, 2011
7777570 Transformer power combiner having secondary winding conductors magnetically coupled to primary winding conductors and configured in topology including series connection and parallel connection Aug. 17, 2010
7683709 Low frequency power amplifier employing high frequency magnetic components Mar. 23, 2010
7629852 Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies Dec. 8, 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
7526034 Method and apparatus for communicating between devices having no common electrical ground Apr. 28, 2009
7459981 Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies Dec. 2, 2008
7446613 Power amplifier input structure having a differential output Nov. 4, 2008
7414481 Receiver with colpitts differential oscillator, colpitts quadrature oscillator, and common-gate low noise amplifier Aug. 19, 2008
7405619 Amplification circuit improved with linearity and frequency converter using the same Jul. 29, 2008
7372327 Input structure for a power amplifier and associated methods May. 13, 2008
7348845 System and method for employing variable magnetic flux bias in an amplifier Mar. 25, 2008
7315212 Circuits and methods for implementing transformer-coupled amplifiers at millimeter wave frequencies Jan. 1, 2008
7288989 Low-noise amplifier with a transformer Oct. 30, 2007
7193458 Power supply for guitar amplifier Mar. 20, 2007
7161427 Input structure for a power amplifier and associated methods Jan. 9, 2007
7123090 Low-noise preamplifier, in particular, for nuclear magnetic resonance (NMR) Oct. 17, 2006
7113045 Power amplifier input structure having a differential output Sep. 26, 2006
7053714 Methods and apparatus for switching between class A and A/B operation in a power amplifier May. 30, 2006
7030689 Isolated DC-to-DC converter Apr. 18, 2006
6737916 RF amplifier system having improved power supply May. 18, 2004
6731166 Power amplifier system with multiple primary windings May. 4, 2004
6724250 Transformer of power-amplifier module for an audio device Apr. 20, 2004
6653905 Amplifier for FM antennas Nov. 25, 2003
6424227 Monolithic balanced RF power amplifier Jul. 23, 2002
6359505 Complementary pair-configured telecommunication line driver having synthesized output impedance Mar. 19, 2002
6294955 Apparatus and method for use in disconnecting and/or replacing one of a plurality of power amplifiers in a transmitter while the transmitter is operating Sep. 25, 2001
6252460 FET balun transformer Jun. 26, 2001
6172563 Lossless feedback transistor amplifiers with linearity augmentation Jan. 9, 2001
6133790 In-line, unbalanced amplifier, predistortion circuit Oct. 17, 2000
5450038 Intermediate frequency amplifier and a telecommand signal receiver having such an amplifier Sep. 12, 1995
5404113 High efficiency power amplifier Apr. 4, 1995
5345189 Vectorial signal combiner for generating an amplitude modulated carrier by adding two phase modulated constant envelope carriers Sep. 6, 1994
5187446 Feedback isolation amplifier Feb. 16, 1993
5179461 Broadband optical receiver with passiner tuning network Jan. 12, 1993

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