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Multiplier in Cadence/Operational Amplifier

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rush3k

rush3k

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I am designing a three stage operational amplifier, and I have observed that depending on the number of multiplies (parallel) I choose for my high gain device in Cadence, it affects the gain. Gm should not depend on the parasitics. Any idea why this is happening and if there is a standard way of defining the number of multiples? I am using the NCSU kit
Thanks.
 

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