Modulation of a phase locked loop for spreading the spectrum of

Details Modulation of a phase locked loop for spreading the spectrum of Modulation of a phase locked loop for spreading the spectrum of

1998-06-11

2000-04-04

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 11, 331 17, 331 23, H03D 309, H03L 7087, H03L 7089, H03L 7093

Patent

active

060466464

ABSTRACT:
Apparatus and methods for controlling the frequency spectrum of a clock signal, for example, to reduce EMI emissions. A PLL circuit receives a reference signal and generates an output clock signal. A modulating circuit is coupled to the PLL and generates a modulating signal. The PLL receives the modulating signal and accordingly varies the frequency spectrum of the output clock signal.

REFERENCES:
patent: 5448193 (1995-09-01), Baumert et al.
patent: 5455840 (1995-10-01), Nakauchi et al.
patent: 5457428 (1995-10-01), Alder et al.
patent: 5488627 (1996-01-01), Hardin et al.
patent: 5598405 (1997-01-01), Hirose
patent: 5610955 (1997-03-01), Bland
patent: 5651035 (1997-07-01), Tozun et al.

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