circuit_cook
Junior Member
![* *](https://designers-guide.org/forum/Templates/Forum/default/starblue.gif)
Offline
Posts: 25
|
Hi, I am simulating a control loop stabillity by running transient simulation. Because this loop is a little complicated, and I don't see I can change the architecture. The ota plus input is loaded with current source, so it is a very high impedance node, and some ac positive feedback also from this node. So it is very easy to oscillate. My transient shows there are some initial ringing, but it settles OK. see the attached graph, but the rings seems to have some high frequency ringing attached. about 60MHz My question: Is this loop stable? What could cause that high frequency component. high frequency gain peaking ? pole, zero pair?
Thanks. Judy
|