DIFF Main Group
H03L 7/00 Automatic control of frequency or phase; Synchronisation
Introduced: January 1980
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
IPC defines codes here since 1980.
Child Classifications
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- H03L 7/02 using a frequency discriminator comprising a passive frequency-determining element since 1980 IPC+CPC Available in IPC and CPC
- H03L 7/06 using a reference signal applied to a frequency- or phase-locked loop since 1980 IPC+CPC Available in IPC and CPC
- H03L 7/24 using a reference signal directly applied to the generator since 1980 IPC+CPC Available in IPC and CPC
- H03L 7/26 using energy levels of molecules, atoms, or subatomic particles as a frequency reference since 1980 IPC+CPC Available in IPC and CPC