Method for automatically regulating an oscillator

Details Method for automatically regulating an oscillator Method for automatically regulating an oscillator

2006-10-24

2006-10-24

Lee, Thomas (Department: 2115)

Electrical computers and digital processing systems: support

Synchronization of clock or timing signals, data, or pulses

C713S322000, C365S233100

Reexamination Certificate

active

07127628

ABSTRACT:
A method for automatically regulating an oscillator is applicable to a low-speed USB interface connecting system and includes the steps of (a) providing a voltage-controlled oscillator in a USB interface for generating a controllable oscillating signal to a USB electronic device; (b) feeding back the controllable oscillating signal to a frequency comparing unit for comparing the controllable oscillating signal with a Keep Alive Strobe signal in the USB interface; (c) inputting an output signal of the frequency comparing unit to a frequency regulating unit for changing the frequency of the controllable oscillating signal according to a signal regulating voltage fed back from the frequency comparing unit; and (d) repeating (b) and (c) to synchronize the controllable oscillating signal with the Keep Alive Strobe signal in the USB interface; so that the USB interface connecting system and the USB electronic device may be quickly synchronized for data transmission at reduced cost.

REFERENCES:
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patent: 6525616 (2003-02-01), Williams et al.
patent: 6657917 (2003-12-01), Lever
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patent: 6898721 (2005-05-01), Schmidt
patent: 2002/0065966 (2002-05-01), Brief
patent: 2003/0227334 (2003-12-01), Chuang et al.

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