I'm using the LPV821 op-amp for a buffer circuit (voltage follower). Below is my circuit, where the Vin is a non-deal source with very high output resistance (~700KOhm) and the desired output has the same voltage as the input but with low impedance.
The circuit works only with ideal source (little or no impedance between Vin and +IN). But it does not output anything for my non-ideal voltage source (When there's a large resistor between Vin and +IN). I was wondering if I could have some suggestions on why I'm not getting the desired output.