Digital phase locked loop circuit

Details Digital phase locked loop circuit Digital phase locked loop circuit

1991-07-15

1993-03-09

Shoop, Jr., William M.

Pulse or digital communications

Spread spectrum

Direct sequence

375 81, 332127, H04I 2712

Patent

active

051931036

ABSTRACT:
An all-digital phase locked loop circuit is described in which a numerically controlled oscillator is driven at a multiple of a required output frequency; a counter is provided to divide the output frequency of the oscillator by the multiple; an analogue to digital converter is provided to sample an input signal having the required frequency, and the frequency of the numerically controlled oscillator provides the sampling rate of the converter.

REFERENCES:
patent: 3548320 (1970-12-01), Roberts et al.
patent: 3621403 (1971-03-01), Seiy
patent: 3713017 (1973-01-01), Vena
patent: 3761625 (1973-09-01), Bruene
patent: 3890581 (1975-06-01), Stuart et al.
patent: 4672637 (1987-06-01), Halpern et al.

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