Programmable oscillators for high frequency clock generation...

Details Programmable oscillators for high frequency clock generation... Programmable oscillators for high frequency clock generation...

2008-01-15

2008-01-15

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C703S013000, C703S015000

Reexamination Certificate

active

07319367

ABSTRACT:
A method and programmable oscillator model are provided for implementing high frequency clock generation for a simulation environment. The programmable oscillator model includes an internal ring oscillator for generating a high frequency clock. The internal ring oscillator counts a number of clocks and determines when to switch the reference clock. For example, a clock edge time is recorded as a two-byte field, where a high byte records a programmable number of fast clocks per clock edge, and a low byte records a fraction of a clock edge. Each time the reference clock switches a count down counter is loaded with the high byte, and the low byte is added to the current fraction. If the fraction has a carry, an additional fast clock is added to the count down counter.

REFERENCES:
patent: 6110217 (2000-08-01), Kazmierski et al.
patent: 6216099 (2001-04-01), Fang et al.
patent: 2003/0204389 (2003-10-01), Feldmann et al.

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