How to derermine the optimum bias resistor value ?

[stratus46]

I've drawn it. I was asking what determines the value of R-bias (on the schematic) when the designer wants to optimize overall performance (noise, stability, distortion etc) ? In my case, it isn't a buffer, so the input impedance (determined mainly by R-bias) doesn't need to be high at all cost. I just want to get the best performance out of an op amp.

It's not a tube amp. Stop wasting time with bias supplies and use dual power supplies. Many of your problems will just go away.

G²

 

[DF96]

I suspect the OP is not designing anything, but reading a textbook and trying to understand it.