Fully Integrated Frequency Reference With 1.7 ppm Temperature Accuracy Within 0–80°C Erdogan Ozgur Ates, Atilim Ergul , Student Member , IEEE, and Devrim

Abstract

A fully integrated 52 MHz frequency reference, de- signed in a 0.35 µm CMOS process, achieves 1.7 ppm frequency temperature accuracy within 0 to 80°C using a nonlinear com- pensation technique. The proposed low TC reference oscillator achieves the lowest reported unc ompensated temperature coef fi- cient, i.e., 65.25 ppm/°C, among the integrated frequency r efer- ences. The output reference freq uency is obtained by dividing the differential LC Colpitts oscillator output operating at 1.6 GHz. Os- cillator core dissipates 14 mW from 2.5 V. The blocks relat ed to the temperature compensation sc heme and the remaining system blocks consume 3 mW and 165 mW from 3.3 V supply, respec- tively. The measured phase noise of 52 MHz output i s –94 dBc/Hz at 10 kHz offset frequency and rms period jitter is 3.2 ps.