CMOS colpitts LC reference oscillator with 70ppm absolute frequency accuracy within 0 – 80 °C

This paper presents design and simulation of two temperature compensated LC Colpitts reference oscillator. First uses an on-chip differential inductor while the other one uses bondwire inductor. Technology is 0.35 mum 2P/4M CMOS technology with high resistivity poly and thick metal option. Oscillator with on-chip differential inductor consumes 7.5 mA from 2.5 V supply and absolute peak frequency deviation is 70 ppm within 0-80degC and oscillator with bondwire inductor consumes 1.5 mA from 2.5 V supply and absolute peak frequency deviation is 150 ppm between 0-80degC. Nominal operating frequency is 1.5 GHz for both oscillators.