Hi,
I am using OPA2376 as follower in my circuit.
I found the open-loop output impedance is 150 Ω in the datasheet.
And the output impedance is very low when the socket work as follower. But could your share the specific parameters of output impedance?
Thanks very much!
Well Jiaxin
Both the open loop Zout (Zol) and the loop gain vary with frequency, here is the Zol
It is an easy simulation and the model updates have been working hard to emulate that Zol shape, This rises above 1ohm (log scale) above 155kHz. That seems low for a 5.5Mhz part, would suggest a very load dependent SSBW response.
Yep that higher Zout closed loop above 1MHz really influences the response vs load, the 10kohm load is very nice broadband - 500ohm load, much lower SSBW. I always find it odd there are no small signal response curves (measured) vs gain and load in these lower speed parts - not hard to do, and kind of basic to any device description - yes, if the model is really good (and I think there now with the GWL) you can estimate response in sim, but the bench is what we normally start with and try to get the sims to match.
