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AD8352 DIFFERENTIAL AMPLIFIER

Currently am using AD8352 AC coupled  differential amplifier to drive ADC AD9445, It is working fine for sine wave input with any frequency... The problem is whenever we try to apply a pulse input with varied duty cycle to differential amplifier it introduces an  undesired DC OFFSET at the output....... what modification shall i make to work amplifier properly ( provides the  clean output except DC OFFSET) with an varied duty cycle.... Am attaching the schematic....any help would be appreciated..... 

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  • Hi Chandrakant,

     

    I know you mentioned on your earlier post that you were applying a pulsed input with a varied duty cycle. Other than a sine or pulsed input, have you tried applying a square, triangle, or saw-tooth wave input with variable frequency and duty cycle? Also, make sure that the DC offset of the generator you are using is not introducing any DC offset to your generated signal. Some oscilloscope output plots would be really helpful in allowing us to see what exactly is going on with the circuitry.

     

    Thanks,

    Joe

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  • Hi Chandrakant,

     

    I know you mentioned on your earlier post that you were applying a pulsed input with a varied duty cycle. Other than a sine or pulsed input, have you tried applying a square, triangle, or saw-tooth wave input with variable frequency and duty cycle? Also, make sure that the DC offset of the generator you are using is not introducing any DC offset to your generated signal. Some oscilloscope output plots would be really helpful in allowing us to see what exactly is going on with the circuitry.

     

    Thanks,

    Joe

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