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)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements

CPC: 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)

Full Title

Full titles differ between systems:

IPC:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements > Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements

CPC:

Of 6 combined children, 5 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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H03F 1/083 +1 CPC CPC only CPC only
H03F 1/10 by use of amplifying elements with multiple electrode connections IPC+CPC Available in IPC and CPC
H03F 1/12 by use of attenuating means IPC+CPC Available in IPC and CPC
H03F 1/14 by use of neutralising means IPC+CPC Available in IPC and CPC
H03F 1/18 by use of distributed coupling IPC+CPC Available in IPC and CPC
H03F 1/22 by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively +2 CPC IPC+CPC Available in IPC and CPC