Clock-signal regenerator comprising a crystal oscillator incorpo

Details Clock-signal regenerator comprising a crystal oscillator incorpo Clock-signal regenerator comprising a crystal oscillator incorpo

1987-06-04

1988-06-07

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 331 25, 331116R, 332 19, H03L 708, H03B 530

Patent

active

047499621

ABSTRACT:
The frequency of a voltage controlled crystal oscillator is conventional pulled by means of a varicap diode forming the load capacitance of the oscillator crystal. In order to realize a wider range of frequency pulling, the load capacitance 44 is alternately switched on and off in a known manner. According to the invention a band-switch diode 46 is utilized as a switch element, the hole-storage time of this diode being as long as or longer than the oscillator cycle. By applying a low-frequency control voltage to the diode it is rendered self-switching within the oscillator cycle, so that proportional frequency tuning is achieved.

REFERENCES:
patent: 3569865 (1971-03-01), Heaky
patent: 3603893 (1971-09-01), Hughes

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