CMOS ring oscillator with combined delay stages

Full transistor voltage control oscillators by delay stages are studied in this paper. First we describe the general conditions of oscillators and after introducing some common inverters, calculating their delay times, we analyze the dependence of delay time to variation of power supply voltage. The...

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Bibliographic Details
Published in:International journal of electronics and communications 2014-06, Vol.68 (6), p.515-519
Main Authors: Ramazani, Abbas, Biabani, Sadegh, Hadidi, Gholamreza
Format: Article
Language:English
Subjects:
CMOS
Frequency stability
Inverter
Ring oscillator
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Summary:Full transistor voltage control oscillators by delay stages are studied in this paper. First we describe the general conditions of oscillators and after introducing some common inverters, calculating their delay times, we analyze the dependence of delay time to variation of power supply voltage. The analyzing results show that the delay of basic type inverter varies in the opposite direction as that of current starved inverter, therefore to achieve better frequency stability versus voltage power supply changing, some combined structures of inverters are presented. The results of simulation by 0.18 CMOS technology library of HSPICE approve the analysis results.
ISSN:1434-8411
1618-0399
DOI:10.1016/j.aeue.2013.12.008