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Low phase noise on-chip oscillator for implantable biomedical applications
, Article Proceedings - IEEE International Symposium on Circuits and Systems ; 2011 , Pages 213-216 ; 02714310 (ISSN) ; 9781424494736 (ISBN) ; Atarodi, M ; Saeedi, S ; Sharif University of Technology
Abstract
On-chip accurate clock references are one of the essential building blocks in fully integrated Systems-On-Chips (SOC). In this paper, a low phase noise, temperature and supply voltage independent clock reference is presented. It provides the reference frequency for a biomedical implantable system. The simulated phase noise at 100 KHz offset from 2MHz carrier is 113dBc/Hz. Simulations show the frequency remains within 0.34% of the nominal oscillation frequency in the operating voltage range of 1.7 - 1.9 V without any calibration and its change in the temperature range of 20-to100C is 0.5%. The circuit consumes 77W and is designed in a 0.18m technology with 1.8V supply voltage