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A Fully Differential Comparator-Based Switched-Capacitor \Delta \Sigma Modulator

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2 Author(s)
Mu-Chen Huang ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei ; Shen-Iuan Liu

In this brief, a fully differential comparator-based switched-capacitor (CBSC) second-order delta-sigma (DeltaSigma) modulator is presented. To ensure differential operation, the CBSC DeltaSigma modulator utilizes a common-mode feedback circuit to balance the pull-up current and the pull-down current in the ramp generator. This modulator has been fabricated in a standard 0.18-mum CMOS process. The active area is 0.21 mm2, and the power consumption, excluding output buffers, is 0.42 mW from a 1.8-V supply. This modulator achieves 65.3-dB signal-to-noise-plus-distortion ratio and an input dynamic range of 71 dB when sampled at 2.56 MS/s (OSR = 64).

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:56 ,  Issue: 5 )