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Problem with bump in the output of GmC integrator

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CherryQ

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Hi All,

I am designing a GmC integrator, with OTA as the second stage to provide miller capacitor. But the output has a bump before integration. I replaced Gm and OTA with ideal model and the problem is still there. Any help will be appreciated.

PS: attached figure shows the input differential pulse(bottom), reset after each pulse(middle), and integrator output(top).
 

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