期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 44, 期 2, 页码 458-472出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2008.2010973
关键词
Delta-sigma modulator; inverter-based switched-capacitor circuit; operational transconductance amplifier; scaled CMOS technology; switched-capacitor circuit
资金
- Samsung Electronics Co. Ltd.
An operational transconductance amplifier (OTA) is a major building block and consumes most of the power in switched-capacitor (SC) circuits, but it is difficult to design low-voltage OTAs in scaled CMOS technologies. Instead of using an OTA, this paper proposes an inverter-based SIC circuit and its application to low-voltage, low-power delta-sigma (AS) modulators. Detailed analysis and design optimizations are also provided. Three inverter-based Delta Sigma modulators are implemented for an implantable pacemaker, a CMOS image sensor, and an audio codec. The modulator-I for an implantable pacemaker achieves 65-dB peak-SNDR for 120-Hz bandwidth consuming 0.73 mu W with 1.5 V supply. The modulator-II for a CMOS image sensor implemented with 320-channel parallel ADC architecture achieves 63-dB peak-SNDR for 8-kHz bandwidth consuming 5.6 mu W for each channel with 1.2-V supply. The modulator-III for an audio codec achieves 81-dB peak-SNDR with 20-kHz bandwidth consuming 36 mu W with 0.7-V supply. The prototype Delta Sigma modulators achieved high power efficiency maintaining sufficient performances for practical applications.
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