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PROGRAMMABLE_BANDPASS_USING_TWIN_T_BRIDGE

2016-05-17 15:46  
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PROGRAMMABLE_BANDPASS_USING_TWIN_T_BRIDGE
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.