IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
A 5.5mW 80-400MHz Gm-C low pass filter with a unique auto-tuning system
Ting GaoWei LiYunfeng ChenNing LiJunyan Ren
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2011 Volume 8 Issue 13 Pages 1034-1039

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Abstract

A CMOS 80-400MHz fifth order Chebyshev Gm-C low pass filter with a unique auto tuning system is presented. Both Gm and C are tuned digitally leading to a 5X tuning range. A digital magnitude-locked loop liked tuning system is proposed. The tuning system uses a digital calibration scheme, broadening the tuning range dramatically. A fifth order Chebyshev Gm-C filter with the proposed auto tuning system was designed with TSMC 0.13µm RF CMOS process for verification. Measurement results show that the cut-off frequency of the filter can be tuned between 80-400MHz, with an average tuning error of no larger than 3.6%. The dynamic range of the filter for THD less than 1% is 60dB. The power dissipation is only 5.5mW with 1.2V supply voltage.

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© 2011 by The Institute of Electronics, Information and Communication Engineers
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