What the output impedance of the ADA4927 amplifier?
Thanks for using ADI products. Please see the image below. Does this answer your questions?
Thanks and best regards,
You say that closed loop output impedance is the same as differential output impedance? For example: In the ADA4960 or AD8351 amplifiers output differential resistance is 150 Ohm and capacitance ~1 pF.
In the image you have attached I see that ADA4927 was tested up to 1000 MHz only. Above 1 GHz it doesn't work correctly?
Sorry for getting back late. The output stage of the ADA4927 looks like a voltage source so you expect its output resistance to be the inverse of its open loop gain. This means it will be very low at low frequencies, begins to increase sharply near its bandwidth and flattens out at an ohmic value at its bandwidth that represents the resistance of the measurement system.
The plots shown above represents Ro of the part up to its bandwidth. It shows a very low resistance (milliohms) at low frequencies and share rise near its bandwidth.
I hope this helps!
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