發明
中華民國
108116251
I 697210
具自動頻帶選擇器之鎖相迴路及其多頻帶壓控振盪器
國立中山大學
2020/06/21
一種具自動頻帶選擇器之鎖相迴路包含一頻率相位偵測器、一電荷泵、一低通濾波器、一自動頻帶選擇器、一多頻帶壓控振盪器及一除頻器,該電荷泵接收頻率相位偵測器輸出之上升訊號及下降訊號並輸出類比電壓,類比電壓經由低通濾波器濾波為控制訊號並傳送至多頻帶壓控振盪器進行頻率控制,其中該自動頻帶選擇器能夠根據控制訊號改變該多頻帶壓控振盪器的頻帶,在製程變異大導致頻率偏移不在預期操作頻率時,仍可藉由頻帶的改變而正常動作。 A phase-locked loop with automatic band selector includes a frequency phase detector, a charge pump, a low pass filter, an automatic band selector, a multi-band voltage control oscillator and a frequency divider. The charge pump receives the rising signal and the falling signal of the frequency phase detector and outputs the analog voltage. The analog voltage is filtered by the low pass filter into a control signal and transmitted to the multi-band voltage controlled oscillator for frequency control. Wherein the automatic band selector can be controlled the frequency band of the multi-band voltage controlled oscillator according to the control signal, thus when the process variation is too large and the frequency offset is not at the expected operating frequency, the frequency band can still operate normally by the frequency band changing
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