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and its internal reference clock can be provided by the Non-volatile random-access memory. The charge pump is an important part of the pll circuit, whose function is to convert the digital output of the Phase frequency detector into an analog signal, to control the frequency of the Voltage-controlled oscillator. A typical charge pump consists of two current sources with on off switch controls, depending on the UP DOWN pulse signal to decide whether to charge or discharge the loop filter, thus converting the phase difference into a Voltage-controlled oscillator control signal, vl. CHARGE PUMP has three states: 1. Up 1: Vctrl increases; 2. Down 1: VCTRL DOWN; 3. Up Down 0: Vctrl hold. Phase Change Memory (PCM) is very sensitive to noise because of its special material. The noise in the circuit will seriously affect the operating time and operating threshold of the memory cell. The high frequency signal generated by pll will be the most serious noise source in the peripheral circuit of phase change memory. 

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甲蟲音樂家們?nèi)褙炞⒌卣裰岚颍瑑?yōu)美的音韻，像靈泉一般流了出來(lái)

燦爛的陽(yáng)光穿過樹葉間的空隙，透過早霧，一縷縷地灑滿了校園。   

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