Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1997-11-14
1999-11-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327160, 331 25, H03L 706
Patent
active
059949325
ABSTRACT:
A phase locked loop circuit for extracting a clock component from an input signal and generating a phase locked clock signal. Operates to detect a partial loss of the input signal and keep the input signal of a low-pass filter that is one component of the circuit zero. The clock signal is controlled to be far from an originally assumed signal while a partial loss of the input signal is detected. Hence, the pull-in operation of the PLL is expedited after the normal clock signal can be extracted.
REFERENCES:
patent: 5202906 (1993-04-01), Saito
patent: 5574757 (1996-11-01), Ogawa
patent: 5726607 (1998-03-01), Brede
Callahan Timothy P.
Luu An T.
Maioli Jay H.
Sony Corporation
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