Method for automatically regulating an oscillator
First Claim
1. A method for automatically regulating an oscillator applicable to a low-speed USB interface connecting system, comprising the steps of:
- (a) providing a voltage-controlled oscillator in a USB interface so that a controllable oscillating signal is generated by said voltage-controlled oscillator to a USB electronic device;
(b) feeding back said controllable oscillating signal to a frequency comparing unit which is used to compare said controllable oscillating signal with a Keep Alive Strobe signal in said USB interface in order to find a difference between frequencies of said controllable oscillating signal and said Keep Alive Strobe signal;
(c) inputting an output signal of the frequency comparing unit to a frequency regulating unit where the frequency of said controllable oscillating signal is changed according to a signal regulating voltage fed back from said frequency comparing unit; and
(d) repeating steps (b) and (c) to synchronize said controllable oscillating signal with said Keep Alive Strobe signal in said USB interface.
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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.
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Citations
3 Claims
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1. A method for automatically regulating an oscillator applicable to a low-speed USB interface connecting system, comprising the steps of:
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(a) providing a voltage-controlled oscillator in a USB interface so that a controllable oscillating signal is generated by said voltage-controlled oscillator to a USB electronic device; (b) feeding back said controllable oscillating signal to a frequency comparing unit which is used to compare said controllable oscillating signal with a Keep Alive Strobe signal in said USB interface in order to find a difference between frequencies of said controllable oscillating signal and said Keep Alive Strobe signal; (c) inputting an output signal of the frequency comparing unit to a frequency regulating unit where the frequency of said controllable oscillating signal is changed according to a signal regulating voltage fed back from said frequency comparing unit; and
(d) repeating steps (b) and (c) to synchronize said controllable oscillating signal with said Keep Alive Strobe signal in said USB interface. - View Dependent Claims (2, 3)
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Specification