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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
H03F 1/22

by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively

Introduced: September 1968

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 > by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively

CPC:

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 (wide-band amplifiers with inter-stage coupling networks incorporating these impedances H03F1/42) > by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively

CPC subdivides this area 3x more granularly than IPC with 2 additional codes.

2 codes are CPC-only extensions.

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