收稿日期: 2010-04-26
修回日期: 2010-05-28
网络出版日期: 2011-03-15
基金资助
国家863高技术研究发展计划课题(2008AA010701)资助
Design of a Gm-C complex filter based on a simple frequency tuning circuit
Received date: 2010-04-26
Revised date: 2010-05-28
Online published: 2011-03-15
钟伦贵 , 杨海钢 , 刘飞 , 高同强 , 程心 . 基于伪差分结构跨导器的Gm-C复数滤波器设计[J]. 中国科学院大学学报, 2011 , 28(2) : 235 -240 . DOI: 10.7523/j.issn.2095-6134.2011.2.015
A pseudo differential transconductor with configurable common mode feedback block is proposed.It has high linearity and high input dynamic range, and its input and out common-mode voltage can be set at the same level.Due to its good performance, a complex filter can be easily formed by using cascade design method. A frequency control method is also presented based on a simple tuning circuit to auto-adjust the center frequency of the complex filter, which is more suitable on low power applications when compared with the traditional tuning way based on PLL (phase lock loop) architecture. The tuning circuit consists of some basic digital circuits and a simple oscillator. Based on the aforementioned techniques, a three-order Butterworth Gm-C complex filter is designed and fabricated in Chrt35dg 2P4M CMOS process. The measurement results show that it can provide sufficient imagine rejection to satisfy the requirements of IEEE802.15.4 standard.
Key words： complex filter; frequency tuning; Gm-C; transconductor
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