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Single ended rail-to-rail CMOS OTA based variable-frequency ring-oscillator

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3 Author(s)
Barthelemy, H. ; IMT Technopole de Chateau Gombert, Polytech Marseille, France ; Meillere, S. ; Bourdel, S.

A new current-controlled ring oscillator based on a single-ended rail-to-rail operational transconductance amplifier (OTA) and three simple CMOS inverters is presented in this paper. The tuning frequency of the proposed oscillator is achieved by modifying the OTA DC bias current. Our proposed CMOS oscillator has been simulated under 3.5 V with the 0.8 μm BiCMOS technology from AMS. For a DC bias current between 1 μA to 200 μA, simulation results confirm wide tuning range of 1.2 MHz to 36 MHz. The total circuit area is only 0.05 mm2.

Published in:

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on  (Volume:4 )

Date of Conference:

23-26 May 2004