| Summary: | 碩士 === 中華科技大學 === 電子工程研究所碩士班 === 104 === Analog-to-digital converter (referred to ADC) plays an important role in electronic systems because it is the bridge between analog and digital signals. The audio signal processing requires high-resolution applications.Of the various ADC types, the Sigma-Delta modulator (referred to ΣΔ modulator), due to its high-resolution characteristics, is the top choice in the audio signal processing. This is because the ΣΔ modulator has noise-shaping, frequency shifting, and oversampling characteristics, enabling to shift in-band quantization errors to out of band, the rear end of which is to use Merge Cascade Integrator Comb filter (referred to MCIC Filter) so as to achieve high-resolution requirements.
This paper presents an integrated circuit designed for the ΣΔ modulator using MCIC filter. This MCIC filter can convert high-speed low-resolution signals produced by ΣΔ modulator to low-speed high-resolution signals, which results not only in saving hardware but maintaining the Signal to Noise Ratio. Based on MATLAB simulation of a functional block diagram, this paper intends to write hardware circuit code in Verilog HDL, using QuartusΠ synthesizer circuit as prototype verification, and finally applying Design Compiler Tools to perform logic synthesis using TSMC 0.18μm 1P6M Process Cell-Based Design Flow automatically synthesized layout.
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