Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements

Classification Context

Section:

ELECTRICITY

Class:

ELECTRONIC CIRCUITRY

Subclass:

AMPLIFIERS

Child Classifications

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• H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• H03F 1/08 Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
• H03F 1/26 Modifications of amplifiers to reduce influence of noise generated by amplifying elements
• H03F 1/3 Modifications of amplifiers to reduce influence of variations of temperature or supply voltage
• H03F 1/32 Modifications of amplifiers to reduce non-linear distortion
• H03F 1/34 Negative-feedback-circuit arrangements with or without positive feedback
• H03F 1/38 Positive-feedback circuit arrangements without negative feedback
• H03F 1/42 Modifications of amplifiers to extend the bandwidth
• H03F 1/52 Circuit arrangements for protecting such amplifiers
• H03F 1/56 Modifications of input or output impedances, not otherwise provided for