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)
Introduced: September 1968
Description
H03B covers oscillator and frequency-conversion circuits using active elements (transistors, vacuum tubes, operational amplifiers) operating in linear or analog modes, as opposed to switching operation. This includes LC oscillators, RC oscillators, crystal oscillators, and parametric amplifiers used to generate sinusoidal or other continuous-wave signals at specific frequencies. The class also encompasses noise generation circuits and frequency conversion techniques such as heterodyning and mixing, but excludes digital oscillators, switching-mode converters, and pulse-generation circuits classified under H03K.
Title
Titles differ between systems:
IPC: 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
CPC: 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)
Full Title
Full titles differ between systems:
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
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)
Of 18 combined children, 15 exist in both systems.
3 codes are CPC-only extensions.
Note: 3 CPC extensions are marked as secondary classification only.
9 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H03B 11/00 Generation of oscillations using a shock-excited tuned circuit (with feedback H03B5/00) IPC+CPC Available in IPC and CPC
- H03B 13/00 Generation of oscillations using deflection of electron beam in a cathode-ray tube IPC+CPC Available in IPC and CPC
- H03B 15/00 Generation of oscillations using galvano-magnetic devices, e.g. Hall-effect devices, or using superconductivity effects +2 CPC IPC+CPC Available in IPC and CPC
- H03B 17/00 Generation of oscillations using radiation source and detector, e.g. with interposed variable obturator IPC+CPC Available in IPC and CPC
- H03B 19/00 Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source (transference of modulation from one carrier to another H03D7/00) IPC+CPC Available in IPC and CPC
- H03B 21/00 Generation of oscillations by combining unmodulated signals of different frequencies (H03B19/00 takes precedence; frequency changing circuits in general H03D) IPC+CPC Available in IPC and CPC
- H03B 2200/00 Indexing scheme relating to details of oscillators covered by H03B 2nd only +4 CPC CPC only CPC only
- H03B 2201/00 Aspects of oscillators relating to varying the frequency of the oscillations 2nd only +3 CPC CPC only CPC only
- H03B 2202/00 Aspects of oscillators relating to reduction of undesired oscillations 2nd only +8 CPC CPC only CPC only
- H03B 23/00 Generation of oscillations periodically swept over a predetermined frequency range (angle-modulating circuits in general H03C3/00) IPC+CPC Available in IPC and CPC
- H03B 25/00 Simultaneous generation by a free-running oscillator of oscillations having different frequencies IPC+CPC Available in IPC and CPC
- H03B 27/00 Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs IPC+CPC Available in IPC and CPC
- H03B 28/00 Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations (analogue function generators for performing computing operations G06G7/26; use of transformers for conversion of waveform in AC-AC converters H02M5/18) since 1985 IPC+CPC Available in IPC and CPC
- H03B 5/00 Generation of oscillations using amplifier with regenerative feedback from output to input (H03B9/00, H03B15/00 take precedence) IPC+CPC Available in IPC and CPC
- H03B 7/00 Generation of oscillations using active element having a negative resistance between two of its electrodes (H03B9/00 takes precedence) IPC+CPC Available in IPC and CPC