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This paper presents a high precision multi-bit audio ΔΣ modulator working under IV supply. We propose a kind of asynchronous 4-bit successive approximation quantizer without fast clock generation. Feed-forward topology with digital summing is adopted to relax the amplifier design requirement. Power efficient single stage OTA is adopted to drive the large sampling capacitor with...
A single-loop second-order 3 bits ΔΣ modulator in 180 nm standard CMOS is presented. The design is intended to achieve high linearity in low-voltage low-power environment. The modulator achieves 89-dB SNDR and 98-dB SFDR in 20Hz~16kHz signal bandwidth, while the power consumption is 210 μW under 1-V supply voltage.
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