东南大学学报（自然科学版）2011，Vol.41Issue(4)：682-686,5.DOI:10.3969/j.issn.1001-0505.2011.04.005
一种Gm-C复数带通滤波器调谐电路的设计
Design of tuning circuit for a Gm-C complex band-pass filter
摘要
Abstract
A tuning circuit is designed and implemented on 0. 18 μm RF CMOS process. It can simultaneously tune center frequency and Q factor of a Gm-C complex band-pass filter built with Nauta's transconductor. The digital frequency detector and the improved frame's DAC are applied in the frequency tuning loop of the tuning circuit, and the current mirror which can mirror accurately current under the condition of high output voltage is adopted in the Q tuning circuit. Thus the tuning circuit has capability of supplying the high tuning voltage, which is helpful for improving the filter's linearity. Test results show that output tuning voltage of the tuning circuit can be up to 1. 71 V at 1. 8 V supply voltage. After the filter is tuned, the error of its center frequency and bandwidth is decreased to less than 3%.关键词
Nauta跨导/Gm-C滤波器/线性度/频率和Q值调谐Key words
Nauta's transconductor/Gm-C filter/linearity/tuning of frequency and Q factor分类
信息技术与安全科学引用本文复制引用
孙俊峰,李智群,章丽,李伟..一种Gm-C复数带通滤波器调谐电路的设计[J].东南大学学报（自然科学版）,2011,41(4):682-686,5.基金项目
国家高技术研究发展计划(863计划)资助项目(2007AA01Z2A7). （863计划）
