Modulation Toolkit PLL filter setting

Hello

I try to use the PLL vi in the Modulation Toolkit to lock to an external frequency acquired a 24 bit data acquisition card. The external FREQ is in the range 30-800 Hz (chopper optics) and the sampling frequency is 20kS at this time. The ext signal is a square wave. Finally, I need to generate a sine wave (only in software) locked on the FREQ of ext.

With the default loop filter settings, I cannot get the thing to work properly, means no stable frequency and the BW of the PLL seems to be too high (sin (phase) is trying to follow the square signal if the vco gain is greater than 0.001). I also looked at the example vi "Measures MT Passband PLL". Problem is that I don't have any idea on how to change the loop filterparameters IIR. I checked the Web for some details on the pll, but so far I couldn't understand things. Looks like I need a current depth on control systems...

Can someone give me a hint on how to proceed?  Do I really need a full cycle of the DSP or can I get away with a few experiences?

Thank you

Klaus

Thank you Bernd,

I tried a few filters and now finally done with the default coefficients! It turned out that they work very well for my purpose. However, the default filter for some reason settings any require a signal that passes through 0 (a 0 - 5V TTL will not work!). I now use the vi "scale 1 before I have to send the signal to the processor of the pll. The output nonlinear phase in higher gains can be treated by linearization of phase in a specfic fitting routine. It needs enough oversampling to do.  Now I have at least 80 dB suppression of harmonics in my outs (independent on vco gain) pll.

To really improve things, a filter PLL vi design would be needed that implements all the theory.

Klaus

p.s. I found the tutorials on this site very useful:

http://www.complextoreal.com/tutorial.htm

Tags: NI Software

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