IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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A CMOS RF tunable filter for TV white space transmitter applications
Jongsik KimHyunchol Shin
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2011 Volume 8 Issue 10 Pages 742-747

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Abstract

A UHF-band RF tunable filter is developed for TV white space CMOS transmitter applications. It is based on the combined Sallen-Key and LC notch structure. The inherent transmission zero of the Sallen-Key core is carefully chosen to suppress the 7th-harmonic component of the transmitter output, and the LC notch filter is set to suppress the 9th-harmonic component. The filter is built in 0.18-µm CMOS process and consumes 6.2-mA from a 1.8-V supply. The filter's cutoff frequency is tuned from 100-MHz to 500-MHz in five steps. It is successfully adopted in a TV white space CMOS transmitter integrated circuit.

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