PI controller effect on the DC of error signal in PLL - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: December 13, 2024, 08:22:41 am
content: Hello,I have built a PI controller I have its time domain step responce and AC responce.PI controller is supposed to help with the DC part of the error signal of a PLL system.I cant undertnad how,Is there away i could see it?Thanks.

author: john23
author_rank: Frequent Contributor
timestamp: December 15, 2024, 08:23:47 pm
content: Hello My PLL is suffering from error signal DC drifting over time.I have built a PI controller AC responce and pulse responce shown below.The main this I want this controller to do is to keep the error sinal on the same DC level and make it stop drifitng.In PLL we set the error signal to "travel" around 0V .unlike regular amplifier when we have input and output , where I can see how CW signal will be amplified.In my case I dont know how the PI controller will handle the DC drift of my pll.Is there a way to do something in LTSPICE?Also I added some videos from the lab so you could understand the drift situation I got and in general the situation.Thanks.vid1:https://technionmail-my.sharepoint.com/:v:/g/personal/yefimv_technion_ac_il/EQrgJ9g2aO1JhPXu5AISA6YBl7OoAovXp2k_htpHNqdubw?nav=eyJyZWZlcnJhbEluZm8iOnsicmVmZXJyYWxBcHAiOiJPbmVEcml2ZUZvckJ1c2luZXNzIiwicmVmZXJyYWxBcHBQbGF0Zm9ybSI6IldlYiIsInJlZmVycmFsTW9kZSI6InZpZXciLCJyZWZlcnJhbFZpZXciOiJNeUZpbGVzTGlua0NvcHkifX0&e=Fu1YhYvid2:https://technionmail-my.sharepoint.com/:v:/g/personal/yefimv_technion_ac_il/ESG8wyVDIm5MlUq5R8Yz5aoB88MqvLV2HmIphz0TlJ5Bkw?nav=eyJyZWZlcnJhbEluZm8iOnsicmVmZXJyYWxBcHAiOiJPbmVEcml2ZUZvckJ1c2luZXNzIiwicmVmZXJyYWxBcHBQbGF0Zm9ybSI6IldlYiIsInJlZmVycmFsTW9kZSI6InZpZXciLCJyZWZlcnJhbFZpZXciOiJNeUZpbGVzTGlua0NvcHkifX0&e=wJtm8evid3:https://technionmail-my.sharepoint.com/:v:/g/personal/yefimv_technion_ac_il/EfxfKWs0rMJOvw3dTpR8kiUB9JJDAw5lvhtQQgbBSioBkQ?nav=eyJyZWZlcnJhbEluZm8iOnsicmVmZXJyYWxBcHAiOiJPbmVEcml2ZUZvckJ1c2luZXNzIiwicmVmZXJyYWxBcHBQbGF0Zm9ybSI6IldlYiIsInJlZmVycmFsTW9kZSI6InZpZXciLCJyZWZlcnJhbFZpZXciOiJNeUZpbGVzTGlua0NvcHkifX0&e=Qf7csIvid4:https://technionmail-my.sharepoint.com/:v:/g/personal/yefimv_technion_ac_il/ERJRRPbu79FMjmN7AMxGAYQBZiadA3sc_vKnar8hWwKW8w?nav=eyJyZWZlcnJhbEluZm8iOnsicmVmZXJyYWxBcHAiOiJPbmVEcml2ZUZvckJ1c2luZXNzIiwicmVmZXJyYWxBcHBQbGF0Zm9ybSI6IldlYiIsInJlZmVycmFsTW9kZSI6InZpZXciLCJyZWZlcnJhbFZpZXciOiJNeUZpbGVzTGlua0NvcHkifX0&e=wI7sSNvid5:https://technionmail-my.sharepoint.com/:v:/g/personal/yefimv_technion_ac_il/EcAPcJwART5HipfOoXKLAtYBD3sBcuhENDEgPsTJangXVg?nav=eyJyZWZlcnJhbEluZm8iOnsicmVmZXJyYWxBcHAiOiJPbmVEcml2ZUZvckJ1c2luZXNzIiwicmVmZXJyYWxBcHBQbGF0Zm9ybSI6IldlYiIsInJlZmVycmFsTW9kZSI6InZpZXciLCJyZWZlcnJhbFZpZXciOiJNeUZpbGVzTGlua0NvcHkifX0&e=7vA2B4

author: john23
author_rank: Frequent Contributor
timestamp: December 19, 2024, 10:23:44 pm
content: Hello The controller needs to sweep over the area where the resonance is.Its frequency range is 2MHz , what controller specs can I take from this requirement?Also I was told that I need to plot error signal Vs frequency responce for designing the controller.But my YIG has a drift so its not so stable.Also error signal needs to go to some controller driver in order to have the frequency responce of the FLL.What is the strategy for designing the controller of the FLL?Thanks.

author: john23
author_rank: Frequent Contributor
timestamp: December 20, 2024, 11:03:00 am
content: UPDATE:My system is a frequency locked loop, by the diagram bellow, I intend to make a plot of a frequency Vs error signal as shown below.Given this plot how would it help me to know the controller parameters i should use when building the controller?Thanks.