Other Parts Discussed in Thread: TLV9351,
Hi team,
May I know that what are the input impedance and output impedance of TLV9301 and TLV9351?
Thank you.
Best Regards,
Cindy
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Hi Cindy,
the input impedance is give in the datasheets. Look under "Input Capacitance" in section 6.7.
The "Open-loop output impedance" is also given in section 6.7. See also figure 25 and 26.
The "Closed-loop output impedance" is not given in the datasheet because it heavily depends on the set gain ("closed-loop gain") and by this on the feedback factor ("loop gain") of OPAmp circuit:
"Closed-loop output impedance" = "Open-loop output impedance" / (1 + "Loop Gain").
With
"Loop Gain" = "Open-loop gain" / "Closed-loop gain"
Keep in mind that the "Open-loop gain" is heavily frequency dependent. The "Open-loop gain" plots can also be seen in the datasheets. See figure 7 and 10.
Kai
Hi Cindy,
In addition to Kai's reply, please see this forum post for an explanation on how to calculate the input impedance of an op amp.
Hi Kai,
Thank you for the help!
-Tim Claycomb