CPC Subclass Not Allocatable
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)
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.
18 direct subcodes
Child Classifications
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- H03B 1/00 Details
- H03B 11/00 Generation of oscillations using a shock-excited tuned circuit (with feedback H03B5/00)
- H03B 13/00 Generation of oscillations using deflection of electron beam in a cathode-ray tube
- H03B 15/00 Generation of oscillations using galvano-magnetic devices, e.g. Hall-effect devices, or using superconductivity effects
- H03B 17/00 Generation of oscillations using radiation source and detector, e.g. with interposed variable obturator
- 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)
- H03B 21/00 Generation of oscillations by combining unmodulated signals of different frequencies (H03B19/00 takes precedence; frequency changing circuits in general H03D)
- H03B 2200/00 Indexing scheme relating to details of oscillators covered by H03B
- H03B 2201/00 Aspects of oscillators relating to varying the frequency of the oscillations
- H03B 2202/00 Aspects of oscillators relating to reduction of undesired oscillations
- H03B 23/00 Generation of oscillations periodically swept over a predetermined frequency range (angle-modulating circuits in general H03C3/00)
- H03B 25/00 Simultaneous generation by a free-running oscillator of oscillations having different frequencies
- 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
- 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)
- H03B 29/00 Generation of noise currents and voltages
- H03B 5/00 Generation of oscillations using amplifier with regenerative feedback from output to input (H03B9/00, H03B15/00 take precedence)
- H03B 7/00 Generation of oscillations using active element having a negative resistance between two of its electrodes (H03B9/00 takes precedence)
- H03B 9/00 Generation of oscillations using transit-time effects