CPC Main Group
H03F 1/00 Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
10 direct subcodes
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 (wide-band amplifiers with inter-stage coupling networks incorporating these impedances H03F1/42)
- H03F 1/26 Modifications of amplifiers to reduce influence of noise generated by amplifying elements
- H03F 1/30 Modifications of amplifiers to reduce influence of variations of temperature or supply voltage
- H03F 1/32 Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34)
- H03F 1/34 Negative-feedback-circuit arrangements with or without positive feedback (H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence )
- 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