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IJPAP Vol.48(02) [February 2010] >

Title: Ring oscillators: Characteristics and applications
Authors: Mandal, M K
Sarkar, B C
Keywords: Ring oscillator
CMOS inverter
Phase noise
Timing jitter
Issue Date: Feb-2010
Publisher: CSIR
Abstract: The structure and operating principle of ring oscillators (RO) have been described. The expression for the frequency of oscillation of a complementary metal oxide semiconductor (CMOS) delay cell based conventional ring oscillator is presented and propagation delay of the delay stages is calculated. The limitations of a conventional RO have been studied and a few techniques to overcome these limitations have been mentioned. In this context, some modified structures of ring oscillators such as negative skewed delay RO, multi feedback RO, coupled RO are described for high frequency oscillation. The effect of noise sources on the output of ring oscillators has also been studied. Some potential applications of such ring oscillator based on its voltage tuning characteristics and multiphase outputs are also mentioned.
Page(s): 136-145
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.48(02) [February 2010]

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