半导体学报2011，Vol.32Issue(4)：137-144,8.DOI:10.1088/1674-4926/32/4/045008
A 4th-order reconfigurable analog baseband filter for software-defined radio applications*
A 4th-order reconfigurable analog baseband filter for software-defined radio applications*
摘要
Abstract
This paper presents a 4th-order reconfigurable analog baseband filter for software-defined radios. The design exploits an active-RC low pass filter (LPF) structure with digital assistant, which is flexible for tunability of filter characteristics, such as cut-off frequency, selectivity, type, noise, gain and power. A novel reconfigurable operational amplifier is proposed to realize the optimization of noise and scalability of power dissipation. The chip was fabricated in an SMIC 0.13μm CMOS process. The main filter and frequency calibration circuit occupy 1.8 × 0.8 mm2 and 0.48 × 0.25 mm2 areas, respectively. The measurement results indicate that the filter provides Butterworth and Chebyshev responses with a wide frequency tuning range from 280 kHz to 15 MHz and a gain range from 0 to 18 dB. An IIP3 of 29 dBm is achieved under a 1.2 V power supply. The input inferred noise density varies from 41 to 133 nV/√(Hz) according to a given standard, and the power consumptions are 5.46 mW for low band (from 280 kHz to 3 MHz) and 8.74 mW for high band (from 3 to 15 MHz) mode.关键词
reconfigurable/ software-defined radio/ baseband filter/ digital assistant/ high linearityKey words
reconfigurable/ software-defined radio/ baseband filter/ digital assistant/ high linearity引用本文复制引用
Wang Weiwei,Chang Xuegui,Wang Xiao,Han Kefeng,Tan Xi,Yan Na,Min Hao..A 4th-order reconfigurable analog baseband filter for software-defined radio applications*[J].半导体学报,2011,32(4):137-144,8.基金项目
Project supported by the Important National Science and Technology Specific Projects of China (No.2009ZX01031-003-002),the National High Technology Research and Development Program of China (No.2009AA011605),and the National Natural Science Foundation of China (No.61076028). （No.2009ZX01031-003-002）
