H03F3/52 - CPC Classification Index

ClassID:

219484 ⎘

H03F3/52 - CPC Classification

Classification description:

Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements; Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only

Recent Application in this class:

20160165348

2016-06-09

Systems and methods for detection of load impedance of a transducer device coupled to an audio device

20150078572

2015-03-19

Systems and methods for adaptive noise cancellation by adaptively shaping internal white noise to train a secondary path

20150078560

2015-03-19

Systems and methods for detection of load impedance of a transducer device coupled to an audio device

20150078559

2015-03-19

Systems and methods for detection of load impedance of a transducer device coupled to an audio device

20150027199

2015-01-29

Circuit to extend frequency response of accelerometer

20090224825

2009-09-10

Output circuit of vacuum-tube amplifier

20080042744

2008-02-21

Output circuit of vacuum-tube amplifier

20080018397

2008-01-24

Single-ended screen-regulated cathode-follower output stage for high-fidelity music amplifier

20070296492

2007-12-27

Single stage balanced voltage amplifier

#10

20050258897

2005-11-24

Amplifier arrangement and method for the compensation of a signal component in an amplifier arrangement