A 870 ppm/V 53 ppm/ ° C 7 MHz Non-Trimmed RC Relaxation Oscillator Using Mixed-Signal Compensation Loop From - 40 ∘C to 165 ∘C. - Jianlin Xia; Yongjia Li; Weiyue Qu; Zhongyuan Fang; Jin Wu 004; Feng Lin 001; Encheng Zhu; Weifeng Sun (IEEE Trans. Circuits Syst. I Regul. Pap., 2025)