Narrow range digital clock circuit

Details Narrow range digital clock circuit Narrow range digital clock circuit

1989-02-23

1991-09-17

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

375120, 375 81, 455260, 328155, H03D 324

Patent

active

050501950

ABSTRACT:
The invention provides a digital clock circuit for providing an output clock signal having a frequency varying between predetermined limits. A digital frequency changer circuit is responsive to a fixed frequency signal and to control signals for generating the output clock signal. A circuit means is responsive to a variable reference signal and to the output signal of the clock circuit for generating a binary control word representative of a frequency difference therebetween. A rate multiplier circuit is responsive to the binary control word and the output clock signal for generating the control signals. The only non-digital component of the clock circuit is a local crystal oscillator.

REFERENCES:
patent: 3102164 (1963-08-01), Roiz
patent: 4575860 (1986-03-01), Scordo
patent: 4584695 (1986-08-01), Wong et al.
patent: 4680780 (1987-07-01), Agoston et al.
patent: 4712225 (1987-12-01), Nelson
patent: 4821293 (1989-04-01), Shimizume et al.

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