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In this brief, a fully differential comparator-based switched-capacitor (CBSC) second-order delta-sigma (ΔΣ) modulator is presented. To ensure differential operation, the CBSC ΔΣ 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-μm CMOS process. The active area is 0.21 mm 2 , 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-noiseplus-distortion ratio and an input dynamic range of 71 dB when sampled at 2.56 MS/s (OSR = 64).Index Terms-Common-mode feedback (CMFB), comparatorbased switched-capacitor (CBSC) circuits, delta-sigma (ΔΣ) modulator, fully differential.

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