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The good news is that it all works with the added resistors. Thank you for your help! However, I still don't understand what's going on -- these resistors aren't in the schematics on the datasheet, so I'd still appreciate any input.
Signal input lags comparator input, looking at PC2out with...
Why shouldn't the phase detector 2 work on its own? Can you support that claim? I see nothing in the datasheets to justify it (and PC1 does work fine on it's own). The datasheet describes the operation when the frequencies at the inputs are the same but the phases are not, and that's exactly...
What's your source for that picture? EDIT:I see that figure is from the TI datasheet. What is it supposed to show? The internal resistances to Vdd and Vss from the output?
I will try this as a diagnostic, but putting that in the final circuit defeats the purpose of having a three-state output...
Yes, I am aware of this and I said as much. The most obvious problem is that Vdd is never output.
I never see -0.1V when the signal input lags comparator input -- I only see it when the comparator input lags signal input (see the traces I linked to). So, by your logic the output is never in...
That signal goes from -0.1V to 0.2V. Is that really normal? Shouldn't it go up to 15V?
I'm not ready to dismiss that negative voltage so quickly. It doesn't show up anywhere else and that scope may be old, but it shouldn't have a 0.1V offset (indeed, I've never seen it have a 0.1V offset before).
I'll try putting in different frequency signals to test the device, but I'm ultimately interested in comparing the phases of two signals at the same frequency but different phases (after converting the square wave of the VCO to a sine wave, I'll be driving a resonator, so on resonance it'll have...
I'm new to the forum, so I hope this post is in the right place.
I'm trying to use the 4046's phase comparator 2, but the output isn't doing what I'd expect. Based on the **broken link removed**, I expect the output to be Vdd, Vss, or high impedance, but I'm only seeing very small output...
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