Author： Roh Hyungdong Choi Youngkil Roh Jeongjin
Publisher： Springer Publishing Company
ISSN： 0925-1030
Source： Analog Integrated Circuits and Signal Processing, Vol.64, Iss.2, 2010-08, pp. : 173-182
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Abstract
This paper presents a low-power, high-resolution delta-sigma modulator for use in portable devices. The modulator architecture uses a mixed-loop topology, having both feedback and feedforward paths. A new fully differential operational transconductance amplifier is designed that has a higher slew rate and a higher dc gain than conventional amplifiers. A 0.5-mm2 modulator chip is implemented in a standard 0.25-μm CMOS process and operates with a 1.5-V power supply. Measurement results demonstrate a 89-dB dynamic range in a 20-kHz bandwidth with only 457 μW of power consumption.
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