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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 4891536 |
Solid state switch |
Jan. 2, 1990 |
| 4884038 |
Transconductance amplifier with transformer coupled forward feed |
Nov. 28, 1989 |
| 4659981 |
Input transformer circuit |
Apr. 21, 1987 |
| 4435686 |
Extended cascode amplifier |
Mar. 6, 1984 |
| 4383222 |
Half-wave signal isolator with compensator means to reduce temperature-dependent effects |
May. 10, 1983 |
| 4270061 |
Current transformer input system for AC conversion devices |
May. 26, 1981 |
| 4208633 |
Current supply branching arrangement for separation of signal and supply currents |
Jun. 17, 1980 |
| 4191929 |
Isolation amplifier with high linearity |
Mar. 4, 1980 |
| 4117418 |
Electric amplifier |
Sep. 26, 1978 |
| 4114107 |
Remotely fed intermediate amplifier for communication lines |
Sep. 12, 1978 |
| 4066974 |
Isolation amplifier |
Jan. 3, 1978 |
| 4031480 |
Circuit arrangement for the ungrounded transmission of signals through testing points in communication systems |
Jun. 21, 1977 |
| 3997852 |
RF amplifier |
Dec. 14, 1976 |
| 3988690 |
Amplifier circuit having a floating input stage |
Oct. 26, 1976 |
| 3974425 |
Isolator circuit with improved frequency response |
Aug. 10, 1976 |
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