H03F1/04 - CPC Classification Index

ClassID:

219135 ⎘

H03F1/04 - CPC Classification

Classification description:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements; Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers

Sub-classes:

H03F1/06 » to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators 18

Recent Application in this class:

20220385243

Real-time and adaptive radio-frequency power protection

20210391882

Self-calibrated multi-channel transmission system for a satellite payload

20210152136

Real-time and adaptive radio-frequency power protection

20190356279

Real-time and adaptive radio-frequency power protection

20190149113

Low-radiation interference, high-efficiency, high-linearity, and high-robustness power tube driver of class-D audio amplifier

20190068138

Vacuum tube audio amplifier

20180076806

PWM modulator

20170207759

Hybrid switched mode amplifier

20170180857

Condenser microphone

20160181994

Tunable tube amplifier system of a radio-frequency power generator

20110187453

Linearizer incorporating a phase shifter

20070228988

Vacuum tube circuit

16116015

Steered current source for single-ended class-A amplifier

15607533

Low voltage tube circuits

14960677

Methods and apparatus for relatively invariant input-output spectral relationship amplifiers

14575885

Multi-layer decoupling capacitor for a tube amplifier assembly