Other Parts Discussed in Thread: OPA350
Hi :
I want to know when I use the OPA187 as a buffer , what is the maximum value of the output resistance Rout .
I'm looking forward for your reply.
thanks and best regards
Kim
Hello， we could refer to the OPA350 output impedance test model like this to simulate the OPA187 output impedance with TINA:
So the OPA187 output impedance which is used buffer is simulated as following( The current generator is +-1A sine wave):
The gain is about -28dB with 1K frequency, so the closed loop output impedance is approx. -28dB or 40mΩ, 20 (10^(-28/20)) is about 40mohm.
Hope it is useful for you.