應用於壓控石英振盪器之溫度補償電路的研究

Abstract

本論文提出一新型電壓對溫度呈三次方之曲線產生電路的架構，使用金氧半製程完成一個應用於AT-CUT型壓控石英振盪器之可調式溫度補償電路，在 的溫度範圍內，使石英振盪器的頻率穩定度在2ppm以內。架構中包含能隙參考電壓源、一次方曲線產生電路、三次方曲線產生電路、可調式增益電路、共模回授放大器、類比加法器；並利用可調式增益電路及能隙參考電壓源穩定主動電路，使其克服製程受溫度之影響。針對製程、電源以及溫度偏差所造成的可能誤差，對其進行分析討論。同時建立一套調變機制，藉以涵蓋所有可能的AT-CUT型壓控石英振盪器頻率漂移，達成補償目標。

The purpose of this paper is to develop a novel architecture for temperature compensation in crystal oscillator. The third-order curve in temperature vs. voltage relation is generated. The architecture contains a bandgap voltage reference, a linear equation curve circuit, a cubic circuit, a variable gain circuit, a CMFB, and an analog adder. The tunable temperature-compensated circuit for AT-CUT TCVCXO is manufactured by CMOS process. A variable gain circuit and a bandgap voltage reference is employed to overcome the process variation cased by temperature. The errors caused by process, voltage reference, and the temperature deviation are analyzed. The tuning capability which can compensate them well( ) between -30℃ and 80 ℃ is achieved.