Flexible Baseband Analog Circuits for Software-Defined Radio Front-Ends
| Autor: | Ping Hsiu Tsai, 蔡秉修 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 This thesis presents an approach to design a digitally programmable low pass filter intended for a software-defined radio (SDR) front-end. To obtain high-order filtering, we exploit a cascade of single-amplifier biquadratic sections, namely active-Gm-RC and Rauch. These cells combine the advantage of Gm-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). Furthermore, they provide digitally programmable bandwidth and power consumption with a fully customizable cut-off frequencies range. The realized chips in this work can be generally divided into two categories to their technology. One is realized in 0.18um CMOS technology with 1.8-V supply voltage and the other is realized in 90nm CMOS technology with 1.2-V supply voltage. The 0.18um LPF provides a frequency tuning range between 0.54MHz and 15.71MHz with noise level between 47.9nV/Hz and 186nV/Hz whereby the power consumption conveniently varies from 0.69mW to 21.6mW. The die area is 1.43 * 1.42 mm2. The 90nm LPF provides a frequency tuning range between 0.13MHz and 30MHz with noise level between 87nV/Hz whereby the power consumption conveniently varies from 0.83mW to 25.73mW. The die area is 1.3 * 1.2 mm2. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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