Dear all,
I have some question during the design of a telescopic OpAmp.
Since it needs 4 bias voltages, i want to know how much percentage of the bias voltage fluctuation should i guarantee? Is there any standard?
Also, what kind of biasing structure is prefer? I have used the constant gm one, but i want to know other  common/good choice because it greatly influence the bias voltage.
Thank you very much!

Yours,
George ???