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I found the answer. I built the same circuit in a simulator and watched its behaviour. The critical missing piece was the behaviour of the signal being fed into the VCO. I had modelled the charge pump as a floating point value that increased when UP was set, and decreased when DOWN was set, at a predefined rate (dV/dt), or doing nothing when neither or both ...


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Are the PI and IIR LPF filters equivalent? A PI filter is an IIR LPF, but a low-pass filter is more general. So -- no. Is my understanding of this "modified" PLL structure correct? I can't tell, but I think you're lacking in the understanding of closed-loop control systems. Should the IIR filter work in this case? Maybe, but it depends on ...


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