A Gm-C continuous-time analog filter for IEEE 802.11 a/b/g/n wireless LANs

Authors:
Tien-Yu Lo;Cheng-Sheng Kao;Chung-Chih Hung
Affiliations:
Analog Integrated Circuit Laboratory, Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan 300;Analog Integrated Circuit Laboratory, Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan 300;Analog Integrated Circuit Laboratory, Department of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan 300
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2009

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Abstract

A CMOS transconductor for multi-mode wireless channel selection filter is presented. The linear transconductor is designed based on the flipped-voltage follower (FVF) circuit and an active resistor to achieve the transconductance tuning. The transconductance tuning can be obtained by changing the bias current of the active resistor. A third-order Butterworth low-pass filter implemented with the transconductors was designed by TSMC 0.18-μm CMOS process. The results show that the filter can operate with the cutoff frequency of 10---20 MHz. The tuning range would be suitable for the specifications of IEEE 802.11 a/b/g/n Wireless LANs under the consideration of saving chip areas. In the design, the maximum power consumption is 13 mW with the cutoff frequency of 20 MHz under a 1.8 V supply voltage.