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.
|Number of pages||4|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|State||Published - 1 Dec 1994|
|Event||Proceedings of the 1994 IEEE International Symposium on Circuits and Systems. Part 3 (of 6) - London, England|
Duration: 30 May 1994 → 2 Jun 1994