McClure, Qualey & Rodack, LLP
Track-and-hold charge pump and PLL
Track-and-hold charge pumps and PLL are provided. A track-and-hold charge pump includes a track-and-hold circuit, a transconductance amplifier, a pulse width modulator (PWM), and a pumping switch coupled to the transconductance amplifier. The track-and-hold circuit samples an input signal according to a reference clock. The transconductance amplifier converts the sampled input signal into a current. The PWM provides a PWM signal according to the reference clock. The pumping switch is controlled by the PWM signal, to provide an output current according to the current.
TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
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Cheng-Hsiang Ting-Kuei Chih-Hsien Ruey-Bin Chen-Ting
Hsieh Kuan Chang Sheen Ko