IPC Subgroup
H03F 3/343 with semiconductor devices only
Introduced: July 1974
Last revised: January 2006
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled > with semiconductor devices only
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- AMPLIFIERS
2 direct subcodes
Child Classifications
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- H03F 3/345 with field-effect devices
- H03F 3/347 in integrated circuits