Journal of University of Chinese Academy of Sciences >
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
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
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]. Journal of University of Chinese Academy of Sciences, 2011 , 28(2) : 235 -240 . DOI: 10.7523/j.issn.2095-6134.2011.2.015
[1] Song J Y,Liu X Y,Wang Z G,Design of an active polyphase filter in GSM receiver with low-IF topologies // 9th International Conference on Solid-State and Integrated-Circuit Technology. Beijing, China,2008:1673-1676.
[2] Morici A, Rodriguez S, Rusu A, et al. A 3.6mW 90nm CMOS 2.4GHz receiver front-end design for IEEE 802.15.4 WSNs //International Symposium on Signals Circuits and Systems. Lasi, Romania,2009:1-4.
[3] Janssens J, Steyaert M. CMOS cellular receiver front-ends:from specification to realization // Boston, Kluwer Academic Publishers.2002:24-29.
[4] De Matteis M, Vergine T, Cocciolo G,et al.A programmable active-RC complex filter for wireless communications //16th International Conference on Electronics, Circuits, and Systems. Yasmine Hammamet, Tunisia,2009:187-190.
[5] Deliyannis, Theodore L.Continuous-time active filter design //Boca Raton.CRC Press LLC, 1999:378.
[6] D’Amico S, Giannini V,Baschirotto A.A 4th-order active-Gm-RC reconfigurable filter(UMTS/WLAN) filter
[J].IEEE Journal of Solid-State Circuits, 2006, 41 (7): 1630-1637.
[7] Hideaki M, Hiroki I, Kenichi A,et al.A 1.2-V CMOS complex bandpass filter with a tunable center frequency //Proceedings of the 31st European Solid-State Circuits Conference.Grenoble, France,2005:327-330.
[8] Chen F X,Lin M, Jia H L,et al. A complex BPF with on chip auto-tuning architecture for low-if receivers // 9th International Conference on Solid-State and Integrated-Circuit Technology.Beijing, China,2008:1665-1668.
[9] Pietro A, Sven M,Bert E. A CMOS Gm-C polyphase filter with high image band rejection //Proceedings of the 26th European Solid-State Circuits Conference. Stockholm, Sweden,2000:272-275.
[10] Teo T H, Khoo E S,Uday D. Gm-C complex transitional filter for low-IF wireless LAN application
[J]//Proceddings of the 15th International Conference on Microelectronics. Rome, Italy,2003:110-113.
/
| 〈 |
|
〉 |