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A low-power low-voltage OTA-C sinusoidal oscillator with a large tuning range

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5 Author(s)
Galan, J. ; Dept. Ingenieria Electron., Univ. de Huelva, Spain ; Carvajal, R.G. ; Torralba, A. ; Munoz, F.
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A new operational transconductance amplifier and capacitor based sinusoidal voltage controlled oscillator is presented. The transconductor uses two cross-coupled class-AB pseudo-differential pairs biased by a flipped voltage follower, and it exhibits a wide transconductance range with low power consumption and high linearity. The oscillator has been fabricated in a standard 0.8-μm CMOS process. Experimental results show a frequency tuning range from 1 to 25 MHz. The amplitude is controlled by the transconductor nonlinear characteristic. The circuit is operated at 2-V supply voltage with only 1.58 mW of maximum quiescent power consumption.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:52 ,  Issue: 2 )