DocumentCode :
1349715
Title :
An All-Analog Method to Enhance Amplitude Stability in Pierce Crystal Oscillators
Author :
Hussein, Karim M. ; Hegazi, Emad
Author_Institution :
Ain Shams Univ., Cairo, Egypt
Volume :
59
Issue :
3
fYear :
2012
fDate :
3/1/2012 12:00:00 AM
Firstpage :
463
Lastpage :
470
Abstract :
This work proposes a simple method to enhance amplitude stability in Pierce crystal oscillator. The method is based on a modification of the conventional Pierce oscillator. The pro- posed topology is all-analog, yet it does not use an amplifier-based feedback loop for amplitude control, hence, it saves power, reduces complexity, and layout area. The proposed method does not adversely impact oscillator´s phase noise, and gives good amplitude control results against process, voltage, and temperature (PVT) variations. An example design for a 40 MHz Pierce crystal oscillator is implemented in a standard 0.13 μm CMOS technology and compared to conventional Pierce oscillator results. The current consumption of the oscillator core is 500 μA off 1.2 V supply. The proposed method is extensible to other CMOS VCOs, including Giga-Hertz ones, to reduce design margins on VCO gain.
Keywords :
CMOS integrated circuits; circuit stability; crystal oscillators; phase noise; voltage-controlled oscillators; CMOS VCO; Pierce crystal oscillators; all-analog topology method; amplifier-based feedback loop; amplitude control; amplitude stability; current 500 muA; current consumption; frequency 40 MHz; oscillator phase noise; size 0.13 mum; standard CMOS technology; voltage 1.2 V; Crystals; Logic gates; MOSFETs; Oscillators; Steady-state; Transconductance; Analog amplitude control; CMOS oscillator; crystal oscillator; digital amplitude control;
fLanguage :
English
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
Publisher :
ieee
ISSN :
1549-8328
Type :
jour
DOI :
10.1109/TCSI.2011.2167270
Filename :
6044733
Link To Document :
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