Hi!
Cmos opamp (repeater) has output on I/O pad. Complex capacitance of this pad may has different amount, say, 10-15pF. How to disable auto-oscillations of this repeater w/o using big internal miller cap...
Thanks!

 

Hi,

Are you perhaps talking about a buffer, or what is the purpose of the op-amp?

If it IS a buffer, a resistor (eg. 10..100 Ohm) can be put in-line with the output and the feedback to the inverting pin is then taken after the resistor (contrary to directly at the op-amp output).

 

Thanks for you reply!
This is a repeater for current source. Current may be chosen by different R load and always stable V_ref. R load range : 3KOhm - 300kOhm. Vref range : 0.25 V - (VDD - 2) V. Repeater output may has different C_load...
Miller cap, for example, on cmos transistor, has very big chip area....