Fully differential OTA testbench

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ota testbench

I design a fully differential OTA but have some problems with the simulation config.Can somebody provide suggestions and materials about the OTA testbench.Thank you!
 

good reference
**broken link removed**
 

Thank you very much for you help.It is a good reference.
but It's about opa,not a ota.In OTA the feedback network is capacitor,so the dc op point can not be decided.so we usually add a big resistor parrelell to the cap to give out a dc op point.but the resitor inevitaly load the output of the OTA ,so how to solve this problem?
 

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