concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal

Full Title

Automatic control of frequency or phase; Synchronisation > using a reference signal applied to a frequency- or phase-locked loop > Details of the phase-locked loop > concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal

Classification Context

Section:

ELECTRICITY

Class:

ELECTRONIC CIRCUITRY

Subclass:

AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES

Scope Notes

Limiting references: Circuits for comparing the phase or frequency of two mutually-independent oscillations Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range

Child Classifications

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• H03L 7/087 using at least two phase detectors or a frequency and phase detector in the loop
• H03L 7/089 the phase or frequency detector generating up-down pulses
• H03L 7/091 the phase or frequency detector using a sampling device
• H03L 7/093 using special filtering or amplification characteristics in the loop
• H03L 7/095 using a lock detector
• H03L 7/097 using a comparator for comparing the voltages obtained from two frequency to voltage converters