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A 89-dB DR 457-μW 20-kHz bandwidth delta-sigma modulator with gain-boosting OTAs

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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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Authors and Affiliations

  1. Department of Electrical Engineering, Hanyang University, Ansan, 426-791, Korea

    Hyungdong Roh, Youngkil Choi & Jeongjin Roh

Authors
  1. Hyungdong Roh
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  2. Youngkil Choi
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  3. Jeongjin Roh
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Corresponding author

Correspondence to Jeongjin Roh.

Additional information

This work was supported by the Korean Science and Engineering Foundation (KOSEF) grant funded by the Korean government (MEST) (No. R01-2008-000-11056-0).

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Roh, H., Choi, Y. & Roh, J. A 89-dB DR 457-μW 20-kHz bandwidth delta-sigma modulator with gain-boosting OTAs. Analog Integr Circ Sig Process 64, 173–182 (2010). https://doi.org/10.1007/s10470-009-9431-6

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  • DOI: https://doi.org/10.1007/s10470-009-9431-6

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