A 1.5 +/- 0.39 ppm/degrees C Temperature-Compensated LC Oscillator Using Constant-Biased Varactors

Abstract

This letter presents a temperature compensated oscillator for clock generation across a wide temperature range. The proposed technique deploys the characteristics of the constant-biased varactors to nullify the overall oscillator's temperature coefficient (TC), thereby reducing the temperature drift effect on the oscillator frequency output. Fabricated on a 0.18 μ m CMOS technology, the proposed 2.09 GHz-gm-LC oscillator sees a mere 1.5 ppm ° C frequency drift from-20 ° C to 120° C. The oscillator consumes 10.9 mW at 1.4 V supply, with phase noise of-119.4 dBc/Hz at a 1 MHz offset. The demonstrated technique is useful for providing accurate clock for a variety of applications, including those operating in harsh environment. © 2001-2012 IEEE.