Timeline for How to know if an opamp can drive capacitive loads?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Apr 20, 2022 at 9:42 | comment | added | Kuba hasn't forgotten Monica | All op-amps can drive capacitive loads if you characterize their output impedance (e.g. using a network analyzer), characterize the load impedance (capacitor and parasitics, often significant), and then design a feedback response that will compensate them adequately. It's a trade-off: op-amps by are limited by their output impedance. To get them to drive capacitors faster, you need lower output impedance - this is often done externally with discrete parts. It's hard to beat a 10GHz ft transistor driven at 50mA collector current. Or ten of them in parallel. | |
| Apr 20, 2022 at 0:20 | vote | accept | yolt | ||
| Apr 19, 2022 at 23:15 | answer | added | MarkU | timeline score: 4 | |
| Apr 19, 2022 at 23:14 | comment | added | yolt | Thanks for the comment. The opamp I am designing will be used as an excitation source to drive an unknown amount of capacitance but will be large. Cheers. | |
| Apr 19, 2022 at 23:11 | comment | added | user4574 | You can typically drive a capacitive load with most op-amps if you put a small resistor 10~100 ohms in series with the op-amp output. Besides the capacitor, what kind of load are you driving? | |
| Apr 19, 2022 at 22:54 | history | asked | yolt | CC BY-SA 4.0 |