CPC Subgroup
H03F 3/19 with semiconductor devices only
Full Title
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > High-frequency amplifiers, e.g. radio frequency amplifiers > with semiconductor devices only
3 direct subcodes
Child Classifications
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- H03F 3/191 Tuned amplifiers (H03F3/193, H03F3/195 take precedence)
- H03F 3/193 with field-effect devices (H03F3/195 takes precedence)
- H03F 3/195 in integrated circuits