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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...
This paper presents the design and implementation of a single chip audio delta-sigma (ΔΣ) DAC with headphone driver for hearing aid. It consists of a digital interpolation filter, a ΔΣ modulator, a digital low-pass filter (DLPF) encoder and a class D output stage. A structure of chain of integrators with feedforward summation and local resonator feedbacks is adopted for ΔΣ modulator to shape quantization...
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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