Invention Grant
US09490784B2 Apparatus and method for generating quadrupled reference clock from single ended crystal oscillator 有权
从单端晶体振荡器产生四倍参考时钟的装置和方法

Apparatus and method for generating quadrupled reference clock from single ended crystal oscillator
Abstract:
A method, an apparatus, and a computer program product are provided. The apparatus outputs a sinusoidal signal according to a first clock frequency, generates, a first digital signal having a 25% duty cycle based on the sinusoidal signal, generates a second digital signal having a 25% duty cycle based on the sinusoidal signal, combines the first digital signal and the second digital signal to generate a combined digital signal having a 50% duty cycle and a second clock frequency that is double the first clock frequency, and doubles the second clock frequency of the combined digital signal to generate an output signal having a third clock frequency that is quadruple the first clock frequency. The apparatus further generates a first control voltage and a second control voltage for the first buffer and a third control voltage for the second buffer based on the output signal.
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