A 5-MHz Passband Switched-Capacitor Anti-aliasing Lowpass Filter for High Speed Analog to Digital Converter Applications

• Main Authors: Yun-han Chen, 陳昀翰
• Other Authors: Bin-da Liu
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/35372912898248874296

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 95 === In this thesis, a switched-capacitor (SC) lowpass filter dedicated to high speed ADC applications is proposed. The six-order elliptic filter is selected to reduce the number of operational amplifiers (opamps) and power consumption. The cascade architecture is adopted which has low sensitivity to component tolerances and is efficient in its use of high-order filter circuits. The non-ideal factors within a SC filter are analyzed and modeled using SWITCAP in prior to the transistor-level design. Techniques such as zeros/poles pairing and ordering, dynamic range scaling and optimal capacitance assignment are adopted in the filter design. Simulation results show the overall filter achieves a gain of 0 dB in the passband within 4.72 MHz, with -1.31 dB of maximum passband ripple. The image rejection is under -53 dB at 8 MHz. The lowpass filter is designed with the TSMC 0.35-μm 2P4M process, and occupies an area of approximately 1.8 mm × 2.1 mm.