Design of a Gm-C complex filter based on a simple frequency tuning circuit

doi:10.7523/j.issn.2095-6134.2011.2.015

›› 2011, Vol. 28 ›› Issue (2): 235-240.DOI: 10.7523/j.issn.2095-6134.2011.2.015

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Design of a Gm-C complex filter based on a simple frequency tuning circuit

ZHONG Lun-Gui^1,2, YANG Hai-Gang¹, LIU Fei¹, GAO Tong-Qiang¹, CHENG Xin^1,2

1. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University, Chinese Academy of Sciences, Beijing 100049, China

Received:2010-04-26 Revised:2010-05-28 Online:2011-03-15

Abstract

Abstract:

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

CLC Number:

TN432

ZHONG Lun-Gui, YANG Hai-Gang, LIU Fei, GAO Tong-Qiang, CHENG Xin. Design of a Gm-C complex filter based on a simple frequency tuning circuit[J]. , 2011, 28(2): 235-240.

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Design of a Gm-C complex filter based on a simple frequency tuning circuit

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