Digital clock modulator

Details Digital clock modulator Digital clock modulator

2004-08-02

2008-10-14

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Clock or pulse waveform generating

C327S176000, C327S262000, C327S277000

Reexamination Certificate

active

07436235

ABSTRACT:
A digital clock modulator provides a smoothly modulated clock period to reduce emitted electro-magnetic radiation (EMR). The digital clock modulator includes a plurality of delay elements connected in series and receiving as an input an unmodulated clock signal. A multiplexer receives inputs from unequally spaced taps between the delay elements. A control block provides selection inputs to the multiplexer, and receives the unmodulated clock signal from the delay elements. The delay elements include a last delay element providing the unmodulated clock signal to the control block. The last delay element has a predetermined delay for ensuring that the delay elements and related signal paths are in a same stable state before control to the multiplexer changes.

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patent: 7061293 (2006-06-01), Fukushima
patent: 2001/0045857 (2001-11-01), Nunokawa et al.
Hardin et al., Spread Spectrum Clock Generation for the Reduction of Radiated Emissions.

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