Design and Implenentation of a Bandpass Delta-sigma Modulator Using High-Q N-path Filter

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Kabiri, Mohammad Reza | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52201 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Atarodi,Mojtaba; Sharifkhani, Mohammad
Abstract:
Delta-Sigma Analog-to-Digital converters have been positioned themselves as robust reliable converters so far. The magic Of extracting high resolutions from low bit ADC has made them popular between designers. Previously, the noise-shaping magic was used in high-resolution applications such as high-quality audio signal converters. However, as the technology scales and proceeds, these converters are approaching RF applications, too. Power and OSR trade-off limits this progress. To increase OSR in bandpass delta-sigma modulators, more power should be consumed to increase the quality factor of loop filters. In this thesis, a systematic approach has been utilized. An n-path filter is employed as a loop filter. The high-Q trait of the n-path filter helps noise-shaping more aggressively. This idea has brought us a bandpass delta-sigma modulator working in fs=200 MHz, with BW = 500 KHz and ENoB of 11 bits. The designed modulator is simulated in 180 nm CMOS TSMC technology and the results are reported
Keywords:
Analog to Digital Converter ; Delta-Sigma Modulator ; Low Pass Filters ; N-Path Filter ; Noise Shaping

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