The design of CMOS continuous-time VHF current and voltage-mode lowpass filters with Q-enhancement circuits

Chung-Yu Wu*, Heng Shou Hsu

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

In this paper, very high frequency (VHF) current and voltage biquadratic lowpass filters implemented directly by the linear wideband finite-gain current and voltage amplifiers, respectively, are proposed and analyzed. A new g-enhancement circuit which consists of a finite-gain wideband tunable voltage amplifier and a Miller capacitor is also proposed. It can increase the maximum-gain frequency f M and enhance the maximum-gain quality factor Q M of the VHF lowpass filters. Experimental results have successfully verified the capability of the proposed new filter implementation method in realizing both VHF current and voltage lowpass filters with maximum-gain frequency f M tunable in the range of 148 MHz to 92 MHz. It is also shown from experimental results that the VHF current lowpass biquad with the Q-enhancement circuit has the maximum-gain frequency f M near 185 MHz and the maximum-gain quality factor Q M up to 18.5. A fourth-order Chebyshev current lowpass filter with the cut-off frequency of 190 MHz has been successfully designed by using the current biquads with Q-enhancement circuits.

Original languageEnglish
Pages (from-to)614-624
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume31
Issue number5
DOIs
StatePublished - 1 May 1996

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