Frequency lock system

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

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331 21, 331 27, 328155, H03L 708

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active

046367462

ABSTRACT:
A frequency lock system including an oscillator providing a switching output voltage that switches at a given frequency between fixed periods in each of first and second states and a reference source providing a variable reference voltage that periodically varies from and returns to a given voltage level at a predetermined frequency less than 1/2 the given frequency. A reference lock circuit provides a reference pulse of finite width in response to occurrence of the given voltage level and an oscillator lock circuit provides a control pulse of finite width a certain period after switching of the output from its first to its second state. In addition, a reset circuit resets the oscillator to initiate a new fixed period thereof at the second state in response to temporal coincidence of the reference and control pulses.

REFERENCES:
patent: 4121171 (1978-10-01), Schollmeier
patent: 4290029 (1981-09-01), Streckenbach
patent: 4309662 (1982-01-01), Baudoux

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