Apparatus and method for multiplying frequency of a clock signal
First Claim
1. A method for multiplying frequency of a clock signal, comprising:
- providing an initial oscillator signal;
via a control signal generation circuit, comparing the initial oscillator signal with a reference signal to generate a first control signal and output the first control signal to a threshold value generation circuit;
via the threshold value generation circuit, selecting one of at least one lower threshold value and at least one upper threshold value according to at least the first control signal, and outputting the selected one of the at least one upper and lower threshold values to a digital and logical module; and
via the digital and logical module, processing a comparison between the initial oscillator signal and the selected one of the at least one upper and lower threshold values and a comparison between the initial oscillator signal and a low level signal, so as to output an output clock signal, wherein the step of outputting the output clock signal comprises;
generating a plurality of logic signals by a plurality of comparators comparing the initial oscillator signal with the selected one of the at least one upper and lower threshold values and comparing the initial oscillator signal with the low level signal; and
processing the logic signals by the digital and logical module to output the output clock signal;
wherein while one of the logic signals is updated by the comparison of the initial oscillator signal and the selected one of the at least one upper and lower threshold values, at least other one of the logic signals is updated by the comparison between the initial oscillator signal and the low level signal.
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Abstract
An apparatus and method for multiplying frequency of a clock signal are provided, wherein the apparatus provides an initial oscillator signal, compares the initial oscillator signal with a reference signal to generate a first control signal, selectively outputs one of at least one lower threshold value and at least one upper threshold value from a threshold value generation circuit to a clock output circuit according to at least the first control signal, and updates an output clock signal through a digital and logical module processing the comparison of the initial oscillator signal and the selected one of the at least one upper and lower threshold values and the comparison of the initial oscillator signal and a low level signal.
3 Citations
20 Claims
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1. A method for multiplying frequency of a clock signal, comprising:
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providing an initial oscillator signal; via a control signal generation circuit, comparing the initial oscillator signal with a reference signal to generate a first control signal and output the first control signal to a threshold value generation circuit; via the threshold value generation circuit, selecting one of at least one lower threshold value and at least one upper threshold value according to at least the first control signal, and outputting the selected one of the at least one upper and lower threshold values to a digital and logical module; and via the digital and logical module, processing a comparison between the initial oscillator signal and the selected one of the at least one upper and lower threshold values and a comparison between the initial oscillator signal and a low level signal, so as to output an output clock signal, wherein the step of outputting the output clock signal comprises; generating a plurality of logic signals by a plurality of comparators comparing the initial oscillator signal with the selected one of the at least one upper and lower threshold values and comparing the initial oscillator signal with the low level signal; and processing the logic signals by the digital and logical module to output the output clock signal; wherein while one of the logic signals is updated by the comparison of the initial oscillator signal and the selected one of the at least one upper and lower threshold values, at least other one of the logic signals is updated by the comparison between the initial oscillator signal and the low level signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for multiplying frequency of a clock signal, comprising:
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an oscillation circuit, for generating an initial oscillator signal; a control signal generation circuit, electronically connected to the oscillation circuit, for comparing the initial oscillator signal with a reference signal to generate a first control signal; a threshold value generation circuit, electronically connected to the oscillation circuit and the control signal generation circuit, for receiving the first control signal and outputting each of at least one upper threshold value and at least one lower threshold value by turns according to at least the first control signal; and a clock output circuit, electronically connected to the oscillation circuit, the control signal generation circuit and the threshold value generation circuit and comprising a digital and logical module, wherein the digital and logical module processes a comparison between the initial oscillator signal and the outputted one of the at least one upper and lower threshold values and a comparison between the initial oscillator signal and a low level signal to update an output clock signal, wherein the threshold value generation circuit comprises; a calibration unit, electronically connected to the oscillation circuit and the clock output circuit, for selectively adjusting the at least one upper threshold value and the at least one lower threshold value; and a digital to analog converter, for selectively converting the one of the at least one upper and lower threshold values from digital type to analog type and outputting the converted one of the at least one upper and lower threshold values to the clock output circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification