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A 0.6-V Delta–Sigma Modulator With Subthreshold-Leakage Suppression Switches
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- Authors
- Hyung Dong Roh, Hyoung Joong Kim, Young Kil Choi, Jeong Jin Roh, Yi Gyeong Kim, Jong Kee Kwon
- Issue Date
- 2009-11
- Citation
- IEEE Transactions on Circuits and Systems II : Express Briefs, v.56, no.11, pp.825-829
- ISSN
- 1549-7747
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- A 0.6-V 34-μW delta-sigma modulator implemented by using a standard 0.13-μm complementary metaloxidesemiconductor technology is presented. This brief analyzes a subthreshold-leakage current problem in switched-capacitor circuits and proposes subthreshold-leakage suppression switches to solve the problem. To verify the operation of the subthreshold-leakage suppression switches, two different fifth-order deltasigma modulators are implemented with conventional switches and new switches. The input feedforward architecture is used to reduce the voltage swings of the integrators. A high-performance low-quiescent amplifier architecture is developed for the modulator. The modulator, with new switches, achieves a dynamic range of 83 dB, a peak signal-to-noise ratio of 82 dB, and a peak signal-to-noise-plus-distortion ratio of 81 dB in a signal bandwidth of 20 kHz. The power consumption is 34 μWfor the modulator, and the core chip size is 0.33 mm2. © 2009 IEEE.
- KSP Keywords
- Delta-Sigma Modulator, Distortion ratio, High performance, Input feedforward, Leakage Current, Leakage suppression, Peak-Signal-to-Noise-Ratio(PSNR), Power Consumption, Signal noise ratio(SNR), Switched Capacitor(SC), core chip