AMPLIFIERS

Introduced: September 1968

Description

H03F covers electronic amplification devices and circuits that increase the amplitude, power, or intensity of electrical signals. This subclass encompasses various amplifier types including voltage amplifiers, power amplifiers, radiofrequency amplifiers, and integrated amplifier circuits, along with their operational principles (such as Class A, B, AB, and C operation). The classification includes amplifier design elements, feedback mechanisms, biasing techniques, and impedance matching arrangements. Related signal processing functions like modulation and demodulation that are integral to amplifier operation may be included, though standalone communication system implementations are typically classified elsewhere.

Of 14 combined children, 11 exist in both systems.

3 codes are CPC-only extensions.

Note: 3 CPC extensions are marked as secondary classification only.

Child Classifications

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H03F 1/00 Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements IPC+CPC Available in IPC and CPC
H03F 11/00 Dielectric amplifiers IPC+CPC Available in IPC and CPC
H03F 13/00 Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier IPC+CPC Available in IPC and CPC
H03F 15/00 Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect IPC+CPC Available in IPC and CPC
H03F 17/00 Amplifiers using electroluminescent element or photocell IPC+CPC Available in IPC and CPC
H03F 19/00 Amplifiers using superconductivity effects IPC+CPC Available in IPC and CPC
H03F 2200/00 Indexing scheme relating to amplifiers 2nd only +185 CPC CPC only CPC only
H03F 2201/00 Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00 2nd only +1 CPC CPC only CPC only
H03F 2203/00 Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00 2nd only +5 CPC CPC only CPC only
H03F 3/00 Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements +1 CPC −1 IPC IPC+CPC Available in IPC and CPC
H03F 5/00 Amplifiers with both discharge tubes and semiconductor devices as amplifying elements IPC+CPC Available in IPC and CPC
H03F 7/00 Parametric amplifiers −1 IPC IPC+CPC Available in IPC and CPC
H03F 9/00 Magnetic amplifiers IPC+CPC Available in IPC and CPC
H03F 99/00 Subject matter not provided for in other groups of this subclass since 2009 IPC+CPC Available in IPC and CPC