A 1.5 +/- 0.39 p+/-/°C Temperature-Compensated LC Oscillator Using Constant-Biased Varactors

• Main Authors: Wang, Yong, Chai, Kevin T. C., Mu, Xiaojing, Je, Minkyu, Goh, Wang Ling
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2016
• Subjects: Frequency reference; frequency source; phase-locked loop; temperature compensation; temperature sensor
• Online Access: https://hdl.handle.net/10356/81732; http://hdl.handle.net/10220/39644
• Institution: Nanyang Technological University

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 CMOS technology, the proposed 2.09 GHz-gm-LC oscillator sees a mere 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.