H - Electricity – 03 – L
Patent
H - Electricity
03
L
331/36, 331/50
H03L 7/08 (2006.01) H03B 5/36 (2006.01) H03L 7/099 (2006.01)
Patent
CA 1289632
ABSTRACT: A clock-signal regenerator comprising a crystal oscillator incorporated in a phase-locked loop. The frequency of a voltage controlled crystal oscillator can be pulled in the conventional way by means of a varicap diode forming the load capacitance of the oscillator crystal. In order to realise 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 can be utilised as a switch element, if the hole-storage time of this diode is as long as or longer than the oscillator cycle. By means of a low-frequency control voltage on the diode it is rendered self-switching within the oscillator cycle so that proportional frequency tuning is possible. Fig. 3.
538900
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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