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

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 +1 CPC IPC+CPC Available in IPC and CPC
• 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) +1 CPC IPC+CPC Available in IPC and CPC
• H03F 1/26 Modifications of amplifiers to reduce influence of noise generated by amplifying elements IPC+CPC Available in IPC and CPC
• H03F 1/30 Modifications of amplifiers to reduce influence of variations of temperature or supply voltage +6 CPC IPC+CPC Available in IPC and CPC
• H03F 1/32 Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34) +5 CPC IPC+CPC Available in IPC and CPC
• H03F 1/34 Negative-feedback-circuit arrangements with or without positive feedback (H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence ) +3 CPC IPC+CPC Available in IPC and CPC
• H03F 1/38 Positive-feedback circuit arrangements without negative feedback IPC+CPC Available in IPC and CPC
• H03F 1/42 Modifications of amplifiers to extend the bandwidth −1 IPC IPC+CPC Available in IPC and CPC
• H03F 1/52 Circuit arrangements for protecting such amplifiers since 1980 +2 CPC IPC+CPC Available in IPC and CPC
• H03F 1/56 Modifications of input or output impedances, not otherwise provided for since 1980 +1 CPC IPC+CPC Available in IPC and CPC