Phase comparator

Details Phase comparator Phase comparator

1994-11-09

1996-08-27

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375375, 375376, 331 18, 331 25, H03D 324

Patent

active

055508782

ABSTRACT:
A phase comparator, a loop filter and a VCO compose a PLL. In the phase comparator, a CMI code defined by a CMI data is synchronized with a VCO clock generated in the VCO and an inverted clock of the VCO clock, respectively, to provide first and second synchronized CMI codes. The first synchronized CMI code is delayed to provide a delayed CMI code by a predetermined time dependent on a period of the VCO clock. The first and second synchronized CMI codes are subject to an exclusive OR logic calculation, thereby generating a phase difference signal. The delayed CMI code and the first synchronized CMI code are subject to an exclusive OR logic calculation, and a result of this exclusive OR logic calculation and the VCO clock are subject to an AND logic calculation to provide an enable signal. Only when the enable signal is high, the phase difference signal is sampled to be used as a phase difference signal in the PLL.

REFERENCES:
patent: 3980820 (1976-09-01), Niemi et al.
patent: 4644567 (1987-02-01), Artun et al.
patent: 4789996 (1988-12-01), Butcher
Nikkei Electronics 1989. 2. 20, No. 467, pp. 330-332.

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