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VHF/UHF high-Q bandpass tunable filters design using CMOS-inverter-based transresistance amplifiers

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3 Author(s)
Ping-Hsing Lu ; Inst. of Electron., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Chung-Yu Wu ; Ming-Kai Tsai

A new CMOS inverter-based wideband transresistance (R/sub m/) amplifier is proposed and analyzed. Using the R/sub m/ amplifier, tunable VHF/UHF R/sub m/-C bandpass biquadratic filters can be designed. In these filters, the center frequency f/sub 0/ can be post-tuned by adjusting the control voltages of the R/sub m/ amplifier. Experimental results have shown that the single-ended-output R/sub m/-C bandpass biquad has the center frequency f/sub 0/=368 MHz and the quality factor Q=1.95 whereas the fully-differential-output configuration has Q=360 and f/sub 0/=222.7 MHz.<>

Published in:

Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94  (Volume:5 )

Date of Conference:

May 30 1994-June 2 1994