journal6 ›› 2007, Vol. 28 ›› Issue (5): 70-72.

• Physics and electronics • Previous Articles     Next Articles

Design of Low-Pass Filter Based on R-MOSFET-C


  1. (1.College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;2.College of Physics Science and Information Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2007-09-25 Published:2012-06-11

Abstract: A fourth-order Butterworth low-pass filter with accurate tunable frequency is designed using CMOS operational amplifier.Utilize the liberalized model behavior of an MOS transistor operating in the triode region instead of a passive resistor.Through tuning the grid-voltage of MOS transistor,we can tune the equivalent resistance,accordingly accurately tuning the cut-off frequency of the filter.The filter’s cut-off frequency is 500 kHz.

Key words: R-MOSFET-C filter;Butterworth low-pass filter;PSPICE , simulation

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