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A discrete time single loop 2nd order 5-bit ΔΣ modulator is implemented in 65nm CMOS for digital audio and sensor applications. We propose a power efficient integrator based on periodical-reset dynamic amplifier without static current consumption. A passive inter-stage sampling method is proposed which prevents active buffer. A 3-D capacitance layout implementation method is employed to saving the...
This paper presents a discrete time ΔΣ modulator operating under 1V power supply. To achieve high precision under low voltage while preserve low power consumption, techniques from systematic level to circuits' level are used. On the systematic level, modulator with 4-bit quantizer is employed. The advantage is its excellent stability performance which extends input signal range near to the reference...
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...
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