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 V_C. 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 volume 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.