IPC Subgroup
H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
Introduced: July 1974
Last revised: January 2006
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > High-frequency amplifiers, e.g. radio frequency amplifiers
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- AMPLIFIERS
1 direct subcode
Child Classifications
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- H03F 3/19 with semiconductor devices only