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With a max of 2.3Mhz and min of 400KHz, my VCO control voltage varies from 0.82vdc up to 4.2vdc. Vcc is 5vdc.
I can get the frequency range to start very low, by changing the values of R1 and C1 but this has the effect of drastically reducing the range. ie, 8Khz - 100Khz.
Obviously the vco...
Sorry, what I mean is by manipulating R1 & C1, this is the closest I can get to my preferred o/p. I have omitted R2 to reduce the offset but even this doesn;t seem to be enough.
Thanks for you reply! My fmin would be around 8Khz, I should maybe have made that clearer. The closest I can get with an Fmax of 2Mhz is down to around 400Khz.
Not good!
Hi all,
I am trying to design a PLL circuit with a 4046. I'm looking for a centre frequency of 1MHz and a capture range from as near to 0 as possible upto 2MHz. I've had a play with the circuit and it doesn't seem possible. I've also found this online calculator and this seems to back up my...
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