G - Physics – 06 – K
Patent
G - Physics
06
K
328/102
G06K 19/08 (2006.01) G11B 5/596 (2006.01) G11B 20/14 (2006.01) H03L 7/087 (2006.01)
Patent
CA 1121471
14 Abstract This invention is directed to a system for generating clock signals from a source signal having two har- monically related and phase coherent frequencies such as shown in U.S. Patent 3,534,344 (Santana) and U.S. Patent 3,879,753 (Dunn). The clock system employs a pair of synchronous demodulators for generating a phase error signal to control a voltage controlled oscillator (VCO). The source signal is applied to a pair of synchronous demodulators, each of which is supplied with a different carrier frequency. The output of each demodulator represents the area of the signal being demodulated. The output of each demodulator is zero and a null condition exists when the system is in a phase locked condition. At a non-locked condition, the output of one demodulator has multiple null points. The function of the second demodulator is to resolve the ambiguity between the desired and undesired null points. Carrier signals are generated under control of the VCO by dividing the output of the VCO signal to obtain carrier signals having the appropriate rela- tionship to the source signal. SA978053
339710
International Business Machines Corporation
Kerr Alexander
LandOfFree
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