Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1994-09-30
1996-09-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327105, 327261, 327277, 327156, 327158, 327147, 327149, 331DIG2, 331 17, H03K 5159, H03L 7189
Patent
active
055527272
ABSTRACT:
A digital circuit apparatus having an A/D converter for digitalizing a control voltage which determines the oscillation frequency of an internal clock outputted from a voltage-controlled oscillator, a storing unit for holding a digitalized value, a D/A converter with corrective function for correcting the digital value being held and subjecting the corrected digital value to D/A conversion, and a lock detector for detecting the matching in phase of the internal clock and an external clock. Phase information obtained when the internal clock and the external clock match in phase is held so that, when the generation of the internal clock outputted from the voltage-controlled oscillator is halted and then resumed, the matching in phase of the external clock and internal clock can be achieved in a short period of time.
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"A Variable Delay Line PLL for CPU-Coprocessor Synchronization", Mark Johnson et al., IEEE Journal of Solid-State Circuits, vol. 23, No. 5, Oct. 1988.
Callahan Timothy P.
Le Dinh T.
Mitsubishi Denki & Kabushiki Kaisha
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