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A low-voltage fourth-order audio ΣΔ modulator is designed with a single-loop single-bit feedforward structure. A 2-tap FIR filter is inserted in the feedback loop to effectively attenuate the high frequency quantization noise, resulting 22% reduction in the maximum integration step of the first integrator and relaxing the slew rate requirement for the OTA to 9.5 V/µsec (diff). The summation of feedforward...
A fourth-order continuous-time (CT) Delta-Sigma modulator with 1.5-bit quantizer is presented in this paper. This design is targeted for audio applications that demand high resolution, low supply voltage, and low power consumption. The input-feedforward topology, with optimized coefficients, is utilized to reduce internal signal swings as well as the power consumption. A 1.5-bit quantizer with simple...
A power and area efficient continuous-time input-feedforward delta-sigma modulator (DSM) structure is proposed. The coefficients are optimized to increase the input range and reduce the power. The feedforward paths and the summer are embedded into the quantizer, hence the circuit is simplified, and the power consumption and area are reduced. The prototype chip, fabricated in a 0.13-mum CMOS technology,...
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