Fully Integrated Frequency Reference With 1.7 ppm Temperature Accuracy Within 0-80 degrees C

A fully integrated 52 MHz frequency reference, designed in a 0.35 mu m CMOS process, achieves 1.7 ppm frequency temperature accuracy within 0 to 80 degrees C using a nonlinear compensation technique. The proposed low TCf0 reference oscillator achieves the lowest reported uncompensated temperature coefficient, i.e., 65.25 ppm/degrees C, among the integrated frequency references. The output reference frequency is obtained by dividing the differential LC Colpitts oscillator output operating at 1.6 GHz. Oscillator core dissipates 14 mW from 2.5 V. The blocks related to the temperature compensation scheme and the remaining system blocks consume 3 mW and 165 mW from 3.3 V supply, respectively. The measured phase noise of 52 MHz output is -94 dBc/Hz at 10 kHz offset frequency and rms period jitter is 3.2 ps.