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Low-Voltage, Low-Power, and Wide-Tuning-Range Ring-VCO for Frequency ΔΣ Modulator

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4 Author(s)
Tuan-Vu Cao ; Nanoelectronics group, Department of Informatics, University of Oslo, Norway ; Dag T. Wisland ; Tor Sverre Lande ; Farshad Moradi

A low-voltage, low-power, and wide-tuning-range VCO which converts an analog input voltage to phase information for a frequency ΔΣ modulator is proposed in this paper. The VCO is based on a differential ring oscillator, which is improved with modified symmetric load and a positive feedback in the differential delay cells, a new bias circuit and a full-swing amplifier. The proposed VCO operating with two stages at a power supply voltage of 0.6 V can achieve wide tuning-range and low power consumption of 176.892 uW. The new VCO has a good linearity reducing harmonic distortion for frequency ΔΣ modulator. The circuit is designed using a 65 nm CMOS process.

Published in:

NORCHIP, 2008.

Date of Conference:

16-17 Nov. 2008