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Design >> Analog Design >> Integrator circuit voltage problem
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Message started by singh on Feb 3^rd, 2012, 7:30am

Title: Integrator circuit voltage problem
Post by singh on Feb 3^rd, 2012, 7:30am

Hello,

i am using shown integrator in a circuit which has two phase. after 1st phase of the circuit is over, the integrator has some output (say 0.3 mV) .in the beginning of second phase , i need to provide the negative of output voltage (say -0.3 mV) to the input of integrator. how can i provide the -ive output voltage to input? is it possible to use a switch and by flipping the capacitor C1 and C2 position or just by changing their polarity using switch?

Title: Re: Integrator circuit voltage problem
Post by raja.cedt on Feb 3^rd, 2012, 9:58am

hello singh,
you forgot some input capacitor i guess, are you sure about the schematic?

Thanks.
Raj.

Title: Re: Integrator circuit voltage problem
Post by thomasT on Feb 3^rd, 2012, 10:18am

wat is this

Title: Re: Integrator circuit voltage problem
Post by singh on Feb 3^rd, 2012, 10:39am

schematic is not complete..

i just wanted to know if the polarity of feedback caps is reversed by using a switch , can i feed output with negative value to the input

Title: Re: Integrator circuit voltage problem
Post by raja.cedt on Feb 3^rd, 2012, 11:06am

no ..it's proper polarity

Title: Re: Integrator circuit voltage problem
Post by thechopper on Feb 7^th, 2012, 8:39pm

Hello singh,

not sure why you need to provide the negative of the output at the input of the integrator during the second phase, but for sure you cannot simply switch the feedback caps, since then you will not be holding the info from the first clock phase anywhere.
You need additional caps to perform the action you are requiring.

Best
Tosei