Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 43, Issue 2, Pages 361-370Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2007.914266
Keywords
low power; low voltage; operational transconductance amplifier; sigma-delta modulation; switched capacitator circuits
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A 0.9-V 60-mu W delta-sigma modulator is designed using standard CMOS 0.13-mu m technology. The modulator achieves 83-dB dynamic range in a signal bandwidth of 20 kHz with a sampling frequency of 2 MHz. The input-feedforward architecture is used to reduce the voltage swing of the integrators, which enables low-power amplifiers. By considering the characteristics of the modulator architecture, low-quiescent operational transconductance amplifiers are designed, which use positive feedback to increase dc gain. The designed modulator shows very high figure of merit among the state-of-the-art sub-I-V modulators.
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