H03L AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
Introduced: January 1980
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
Description
H03L covers automatic control systems and circuits that manage the operation of electronic oscillation and pulse generators. This includes starting mechanisms, frequency synchronization, amplitude stabilization, and phase control of oscillators and signal generators. The subclass encompasses feedback control loops, phase-locked loops (PLLs), automatic gain control (AGC), and synchronization circuits used in radio transmitters, receivers, timing systems, and other applications requiring precise oscillation management. Related generator design itself falls under H03B, while modulation techniques are classified separately in H03C.
Additional Content
Generation of oscillations
Related Keywords
5 direct subcodes
Child Classifications
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- H03L 1/00 Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L 3/00 Starting of generators
- H03L 5/00 Automatic control of voltage, current, or power
- H03L 7/00 Automatic control of frequency or phase; Synchronisation
- H03L 9/00 Automatic control not provided for in other groups of this subclass
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