H03 ELECTRONIC CIRCUITRY
Description
H03 encompasses the design, construction, and operation of electronic circuits and circuit components that process, generate, amplify, or control electrical signals. This class covers fundamental circuit elements including resistors, capacitors, inductors, transformers, and semiconductor devices, as well as complete circuit assemblies for applications such as amplification, oscillation, modulation, and switching. The classification includes circuits for signal processing, power conversion, and control functions across a broad range of frequencies and power levels. H03 excludes telecommunications systems and specific applications (covered in other H-series classes) but forms the foundational technology underlying most electronic devices and systems.
IPC and CPC are identically structured here. All 10 subcodes exist in both systems.
7 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H03B GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H) heading +3 CPC IPC+CPC Available in IPC and CPC
- H03C MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M) heading +1 CPC IPC+CPC Available in IPC and CPC
- H03D DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66) heading +1 CPC IPC+CPC Available in IPC and CPC
- H03H IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) heading +7 CPC IPC+CPC Available in IPC and CPC
- H03J TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS heading +1 CPC IPC+CPC Available in IPC and CPC
- H03K PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) heading +1 CPC IPC+CPC Available in IPC and CPC
- H03L AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B) heading since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- H03M CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) heading since 1985 IPC+CPC Available in IPC and CPC