how to select resistor for single supply opamp

[harikrishnam]

for single supply based opamp we are using voltage divider at noninverting terminals how can we select resistor values?some circuits value will be 10k sum times 100k how can we select?

 

[vimalkhanna]

The voltage divider current shall be catering to the input bias current of the selected opamp. as well as catering to inputs swing not going below 0.5VDC where the
Opamp shall be going to cut-in voltage at the base .Kindly realize that the base emitter jn. of the input differential amplifier needs to be in active region for the unit to deliver the correct waveform.

 

[leo_o2]

Resistance is set big enough for that opamp can drive.

 

[harikrishnam]

iam not getting wat u say?

 

[leo_o2]

I mean: if opamp current driving capability is low, you should choose big resistor like 100Kohm. If opamp current driving capability is big, you also can use 10Kohm.
If 10Kohm is ok for driving capability, 10Kohm will have better noise immunity than 100Kohm.