IPC Main Group
H03L 7/00 Automatic control of frequency or phase; Synchronisation
Introduced: January 1980
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
Related Keywords
automatic CONTROL(S) of generators of electronic oscillations or pulsesautomatic control of radio FREQUENCYPHASE-LOCKED LOOP (PLL) for frequency or phase controlSYNCHRONISATION of generators of electronic oscillations or pulses
4 direct subcodes
Child Classifications
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- H03L 7/02 using a frequency discriminator comprising a passive frequency-determining element
- H03L 7/06 using a reference signal applied to a frequency- or phase-locked loop
- H03L 7/24 using a reference signal directly applied to the generator
- H03L 7/26 using energy levels of molecules, atoms, or subatomic particles as a frequency reference
Top Applicants
Top 10 applicants by patent filingsfor class H03, 2013–2023, worldwide · Source: EPO PATSTAT
- QUALCOMM US 5,625
- SAMSUNG ELECTRONICS COMPANY KR 5,496
- MURATA MANUFACTURING COMPANY JP 5,478
- HUAWEI TECHNOLOGIES COMPANY CN 3,383
- INTEL CORPORATION US 3,091
- TEXAS INSTRUMENTS US 3,070
- MURATA MANUFACTURING COMPANY 2,722
- SKYWORKS SOLUTIONS US 2,290
- SEIKO EPSON CORPORATION 2,177
- IBM (INTERNATIONAL BUSINESS MACHINES CORPORATION) US 2,158