Continuous-time VHF lowpass filter design using finite-gain current and voltage amplifiers and special Q-enhancement circuit

Chung-Yu Wu*, Heng Shou Hsu

*Corresponding author for this work

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

A linear wideband class AB finite-gain current amplifier is proposed and analyzed. Considering the intrinsic capacitance of the MOS transistors as filter elements, the current amplifier can be viewed as a VHF lowpass biquad filter. The center frequency fo is tunable from 79.4 MHZ to 144.5 MHZ and the quality factor Q is tunable from 1.03 to 1.19. A linear wideband class AB finite-gain voltage amplifier is also proposed and analyzed. Similarly, the unity - gain voltage amplifier can also be regarded as a VHF voltage biquad lowpass filter with the center frequency tunable from 81 MHZ to 134.89 MHZ and the quality factor tunable from 1.12 to 1.59. A new and special Q-enhancement circuit is also proposed to increase the center frequency fo and enhance the quality factor Q of the VHF filters. It is shown that the center frequency fo is tunable from 173.78 MHZ to 205.6 MHZ and the quality factor Q tunable from 1.69 to 7.21.

Original languageEnglish
Pages (from-to)771-774
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Volume5
DOIs
StatePublished - 1 Dec 1994
EventProceedings of the 1994 IEEE International Symposium on Circuits and Systems. Part 3 (of 6) - London, England
Duration: 30 May 19942 Jun 1994

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