Help me with SC circuit and OTA

[jodenma]

SC and OTA question.

i need design one SC circuit,the frequency of clock is 1MHZ,VDD=2.5V,the visual GND=1.25v.now i need to firm the OTA spec.i want the open-loop gain of OTA is 40db at 1mhz,and the PM is 45 degree at 0db. its right?
the common inout voltage how to firm? and its should be ?

 

[codec]

Re: SC and OTA question.

To make the SPEC, you should consider/caluclate the permitted gain error and loop factor in your application. Normally, >60dB and ~60deg(beta=1) is preferable.