Variable frequency generator

Details Variable frequency generator Variable frequency generator

2006-12-05

2006-12-05

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

C331S17700V

Reexamination Certificate

active

07145371

ABSTRACT:
A digital circuit generates very precise varying clock frequencies for applications that can tolerate a small degree of jitter but require exact longer term frequencies, e.g. a video clock for a laser printer. Some subpixel jitter is acceptable, but the overall pixel rate remains exact and consistent. In some applications, the jitter may be desirable to smear the EMI spectrum. For example, if the high frequency input clock is modulated, the edges of the video clock will also be modulated yet remain within the jitter and frequency specification.

REFERENCES:
patent: 5107278 (1992-04-01), Shimada et al.
patent: 2005/0093583 (2005-05-01), Keithley et al.

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