Multisim and Ultiboard

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Issue with OPAMP LT 1224 ( slew rate 400v/us) in the sample and hold circuit used for pipeline ADC

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Hi,

I am designing a pipeline ADC which operates at 4MHz. For this ,the sample and hold amplifier is implemented using opamp LT1224(SR 400V/us) .I am getting the proper output of this S&H circuit, but if i give output of this circuit to comparator AD8564 for conversion the MultiSim simulation doesn't start.So I reduced Rshunt less than 1e+009 and simulation started but not getting correct output of S&H circuit .So please help me to solve this problem.

 

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