Re: PI controller time domain responce in PLL from AC responce
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Hello , I plugged a signal generator into point A of my system(as shown in the diagram and reccorded the error signal voltage which comes out from the mixer(POINT B).The plot below is based on crude manual point writing .At 9518Mhz we have error 0mV , there is a frequency range shown in red arrow where we have crude linear dependancy between frequency and error.After the red frequency range the error behaves the opposite, exactly in the diagram photo below.Matlab code is attached.What steps do I need to do next to know what is the? condtroller behavior should I use for locking?Video of the setup and measurment is attached in the link.
/g/electronics101/photo/296358/3868979?p=Created%2C%2C%2C20%2C2%2C0%2C0
/g/electronics101/photo/296358/3868978?p=Created%2C%2C%2C20%2C2%2C0%2C0
/g/electronics101/photo/296358/3869434?p=Created%2C%2C%2C20%2C2%2C0%2C0
/g/electronics101/photo/296358/3869468?p=Created%2C%2C%2C20%2C2%2C0%2C0
freq_up=[9516.89,9517.6,9517.69,9517.81,9517.83,9517.86,9517.9,9518,9518.05,9518.07,9518.1,9518.13,9518.18,9518.33,9518.45,9518.68,9519.01,9520.3]
error_up=[40,47,52,31,26,13,3,-0.4,-3.7,-8.3,-13.5,-25,-39,-35,-30,-24,-18,-1]
plot(freq_up,error_up)
xlabel('frequency [MHz]')
ylabel('error signal mixer phase detevtor[mV]')
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