I'm desiring to model a phase-locked loop circuit. As it stands, I have one option in Multisim9: PLL_VIRTUAL. I'd much rather have some popular IC models to choose from, particularly the cd4046. (Anyone out there have it for Multisim?? Yes, I've done the THS7001 component creation tutorial. I still don't know where to start modelling the cd4046, and I have what appears to be a SPICE model for it too. That tutorial, even though I took the time to do it, is still rather lackng.) Anyway, I looked at the PLL_VIRTUAL symbol and it doesn't work or something isn't labelled correctly. Here are the pins of the virtual model: 1. PLLin 2. PDin 3. VCOout 4. PDout 5. LPFout But here's what a PLL actually looks like: 1. fin -- the signal being locked to (one input of the phase detector) 2. fref -- the signal fed back from the VCO (or a divider) (the other input of the phase detector) 3. PDout -- the output of the phase detector, an average DC indicative of the phase difference between the two input frequencies 4. VCOin -- the control voltage input of the VCO -- without it the VCO is free running! 5. VCO (fref) creating components -- the (usually) R(s) and C(s) that setup the VCO's fo and frange In the Multisim model, I'm guessing I have but one LPF option, as it's requesting the cutoff frequency, and I'm guessing that it's a simple RC (as a lead-lag has two break f's.) But what of a lead-lag filter or active LPF options? Moreover, how does one feed a LPF out as a VCO control voltage when there is no VCOin?? Plus, what's the point of seeing a LPF out? That's what Multisim's for, to model (at least) RC LPF circuits, right?? Plus the brief description wasn't helpful either. I know how a PLL works, just not how Multisim models one. I guess what I'm looking for here is: 1. A Multisim model for a cd4046 (ideally) and/or 2. A virtual model for a PLL that makes sense, and, if possible, 3. options besides a simple RC for the LPF, the heart of a successful PLL design Surely someone out there has tried to simulate a PLL in Multisim, right? I sure could use your help! Thanks!

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