A 185-μW, 40-MHz TCXO With a Differential-Pair-Based Polynomial Temperature Compensation Technique Achieving <±2.5 ppm Frequency Error. - Chia-Hsi Fang; Chun-Yu Lin 002; Hung-Che Chien; Shuan Yang; Shan-Chih Tsou; Shon-Hang Wen; Kuan-Dar Chen; Tsung-Hsien Lin 001 (IEEE J. Solid State Circuits, 2026)