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This paper presents a single loop 3rd order 5-bit audio ΣΔ modulator with feed forward path. Feed forward technology relaxes the amplifier design requirement by reducing output swing of the integrators. Chopper stabilization technology is employed to mitigate the flicker noise introduced by 1st integrator. A kind of asynchronous successive approximation (SAR) quantizer without extra fast clock replaces...
In this paper a 1V 15-bit ΔΣ ADC for audio application is presented. Second order modulator with feed-forward path is adopted in order to reduce the swing of each integrator. Non-linear gain effect is mitigated. Single stage amplifier with high power efficiency is employed to save power. Decimation filter is implemented with seven-stage cascade sub-filters. Timing multiplexing and resource reuse methodology...
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.
A 15-bit 3rd order ΔΣ modulator is presented. The feed forward topology with 18-level quantizer is adopted. The signal swing of the 1st integrator is effectively suppressed. A current-mirror OTA with 42dB DC gain is used in the 1st integrator. Chop stabilization is employed to remove the flicker noise. The prototype is fabricated in 0.18μm CMOS. The active die area is 0.85×0.85mm2. The power consumption...
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