PROGRAMMABLE_BANDPASS_USING_TWIN_T_BRIDGE

Published:2009/7/2 3:08:00 Author:May | From:SeekIC

The circuit gives a programmable bandpass where both the cut-over frequency andthe gain，A，are controlled independently．In the twin-T bridge the resistors R and R/2 are replaced by two double FETs，E 430，the channel resistance of the first one in thesenes，the channel resistances of the second one are in parallel as to stimulate the resis-tance R/2． Both these resistors are controlled by Vc which ranges from 0 V to about1 V. The gain of the circuit is set by means of the resistors R2 and R3.



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