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how to see from lab results the PID amplifier which needs to be used

john23 All Messages By This Member #99418 Hello, I have built a PLL system based on the article attached. In the scope photos we see the IF signal of the mixer. When the servo amplifier is ON as shown in photo 3 then the error signal ripple is much much smaller then photo 5. but the VCO keeps moving decreasing the frequency. So ripple wise the amplifier is good but the DC shift is not getting fix. My only spec is getting a lock on the resonant frequency of the resonator shown in the diagram below. We drive the FM coil of the YIG for VCO functionality. My YIG(VCO) FM coil has the following carachteristics: sensitivity 400(Khz/mA) 3dB BW 2MHz resistance 1ohm inductance 1.5uH How can I see what kind of PID needed in my situation? What do you think the PID needs to be to lock in resonant frequency? /g/electronics101/photo/296358/3865523?p=Created%2C%2C%2C20%2C2%2C0%2C0 /g/electronics101/photo/296358/3865522?p=Created%2C%2C%2C20%2C2%2C0%2C0 /g/electronics101/photo/296358/3865521?p=Created%2C%2C%2C20%2C2%2C0%2C0 /g/electronics101/photo/296358/3865520?p=Created%2C%2C%2C20%2C2%2C0%2C0 /g/electronics101/photo/296358/3865519?p=Created%2C%2C%2C20%2C2%2C0%2C0 /g/electronics101/files/john233/High_spectral_purity_microwave_oscillator_design_using_conventional_air-dielectric_cavity%20%284%29.pdf
sdmonaco All Messages By This Member #99421 PID control is not required for PLL operation.? Your loop filter should be a simple low pass chosen such that the frequency sum terms are removed and frequency difference terms are preserved. This is then fed into the VCO as a negative feedback.??

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