Timeline for How do I measure the output impedance of an inverting op-amp built with the LM741?
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Jun 11, 2023 at 21:48 | comment | added | user107063 | @ErnestoG Termonilogy error on my part. I took "loop gain" for "closed loop gain" but that's totally something else. After looking "loop gain" up, the correct answer would likely be "open loop impedance divided by (1-loop gain)" (since the open loop has a loop gain of 0 if I understand correctly and loop gain is usually negative). Deleting my first comment. | |
| Jun 11, 2023 at 21:21 | comment | added | Designalog | @user107063 explain yourself. More loop gain means less output impedance when using shunt output feedback. | |
| Jun 11, 2023 at 0:30 | comment | added | jp314 | It is correct -- voltage feedback REDUCES output impedance of the system. Higher loop gain reduces output impedance (in the extreme, 0 loop gain (i.e. no feedback) leaves ZOUT at the original value of the opamp) | |
| Jun 10, 2023 at 22:23 | history | answered | jp314 | CC BY-SA 4.0 |