頻率追蹤電路及其方法FREQUENCY TRACING CIRCUIT AND METHOD THEREOF

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

13/803,476

專利證號

US 8,824,615 B2

專利獲證名稱

頻率追蹤電路及其方法FREQUENCY TRACING CIRCUIT AND METHOD THEREOF

專利所屬機關 (申請機關)

國立臺灣大學

獲證日期

2014/09/02

技術說明

本發明實施例提供一種頻率追蹤電路。頻率追蹤電路包括邊緣選擇器、相位頻率處理器與數位控制振盪器。邊緣選擇器接收資料信號與回授時脈信號並且依序輸出資料邊緣信號與回授時脈邊緣信號。相位頻率處理器接收資料邊緣信號與回授時脈邊緣信號且根據第一相位差與第二相位差進行微分運算後，輸出頻率調整數位信號。數位控制振盪器接收且根據頻率調整數位信號，以調整其所輸出之回授時脈信號之頻率。相位頻率處理器輸出頻率追蹤信號至邊緣選擇器，邊緣選擇器利用頻率追蹤信號來獲得資料邊緣信號，且利用資料邊緣信號來獲得回授時脈邊緣信號。 A frequency tracking circuit is disclosed. The frequency tracking circuit includes an edge selector, a phase-frequency processor and a digital controlled oscillator. The edge selector receives a data signal and feedback clock signal and sequentially outputs a data edge signal and a feedback clock edge signal. The phase-frequency processor receives the data edge signal and the feedback-clock-edge signal and outputs a frequency adjusting digital signal after executing differential operation according to a first phase difference and a second phase difference. The digital controlled oscillator receives the frequency adjusting digital signal so as to adjust frequency of the feedback clock signal. The phase-frequency processor outputs a frequency tracking signal to the edge selector, wherein the edge selector utilizes the frequency tracking signal for acquiring the data edge signal and utilizes the data edge signal for acquiring the feedback-clock-edge signal.

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