University of Illinois Urbana-Champaign

Noise analysis of a 6 muW 1.5 MHz RC relaxation oscillator

Zhao, Peihua

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https://hdl.handle.net/2142/100061

Description

Title
Noise analysis of a 6 muW 1.5 MHz RC relaxation oscillator
Author(s)
Zhao, Peihua
Contributor(s)
Hanumolu, Pavan K.
Issue Date
2018-05
Keyword(s)
  • RC relaxation oscillator
  • voltage sensitivity
  • regulation
  • 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.
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/100061

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