I would like to use the AD8009 to drive a variable capacitive load over a SMA cable.
According to the datasheet, I need to "insert a resistor in series between the op amp output and the capacitor." It is required to "to prevent instability and improve settling time when driving a capacitor"
My circuit can be summarized like that :
for some reason, I need to apply a constant voltage at the point “A”.
According to the capacitor variation, the voltage at the point “A” will not be constant (voltage divider effect).
What do you recommend to avoid or limit the voltage divider effect?