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Title:Noise analysis of a 6 muW 1.5 MHz RC relaxation oscillator
Author(s):Zhao, Peihua
Contributor(s):Hanumolu, Pavan K.
Subject(s):RC relaxation oscillator
voltage sensitivity
flicker noise
Schmitt trigger
Abstract:With the increasing demand for small volume and low power devices, such as the Internet of Things, RC oscillators have become more attractive. For an RC oscillator used as a timer, the noise and jitter in an RC oscillator are vital issues for the oscillator design. This thesis presents methods to reduce the flicker noise at low offset frequencies of a 6 W 1.5 MHz RC oscillator with a low dropout regulator and offset cancellation technique. This oscillator achieves an accuracy of 30 ppmC and 1500 ppm/V. Noise in RF circuits and the relaxation RC oscillators are analyzed first. Then two methods to reduce oscillator noise are presented. By deleting a current mirror transistor and adding two complementary switch pairs, the modified circuit achieves 5 time improvement in noise performance.
Issue Date:2018-05
Date Available in IDEALS:2018-05-30

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