This study proposes a high frequency stability analog temperature compensated crystal oscillator. A combination of temperature sensors, first-, third-, fourth-, and fifth-order function voltagegenerators, adders, and other unit circuits were utilized to generate the temperature compensation voltage VC.This wassubsequently input into the varactor diode in the VCO to compensate for the temperature vs.frequency of AT-cut quartz crystal. In comparison with traditional direct analog temperature compensation schemes, the proposed chipoffered a lower vol ume and resolved the frequency mutation issue that occurs in indirect digital temperature compensation schemes. The chip was fabricated using 0.18 μm processwith a compact area of only 1.5 mm×1.2 mm. Measurement results demonstrated that the compensation accuracy was within ±0.28×10^-6 and the 1 kHz phase noise was lower than -143 dBc/Hz across a -40 to 85 ℃ temperature range