Clock generator with reduced electromagnetic interference...

Details Clock generator with reduced electromagnetic interference... Clock generator with reduced electromagnetic interference...

2006-12-28

2009-08-25

Pascal, Robert (Department: 2817)

Oscillators

Relaxation oscillators

C331S111000, C331S17700V, C327S132000, C323S282000

Reexamination Certificate

active

07579918

ABSTRACT:
A clock generator includes a current source for generating a constant current; a current mirror coupled between a supply voltage and the current source for generating a mirror current equal to the constant current multiplied by a predetermined value; and a charge control module coupled with the current source and the current mirror for charging a capacitor when a voltage thereof is lower than a predetermined threshold voltage and for discharging the capacitor when the voltage thereof is higher than the predetermined threshold voltage, thereby generating a clock signal at a predetermined frequency, wherein the charge control module adjusts the predetermined frequency by changing the predetermined threshold voltage.

REFERENCES:
patent: 6356161 (2002-03-01), Nolan et al.
patent: 6680656 (2004-01-01), Chen
patent: 6969978 (2005-11-01), Dening
patent: 6980039 (2005-12-01), Dening et al.
patent: 2002/0050868 (2002-05-01), Chen
patent: 08154040 (1996-06-01), None
CN PTO Office Action.

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