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Oct 13th, 2019, 7:56pm
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Set the VCO frequency range (Read 980 times)
Gp
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Set the VCO frequency range
May 29th, 2017, 5:19am
 
Hi All,

I want to design a PLL for 100Mhz cut-off frequency. For this, I want to set the frequency range (Fmax and Fmin) of Voltage controlled oscillator(VCO).
So, How can I decide the frequency range? I mean Fmax & Fmin.

Thanks.
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kumar.g
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Re: Set the VCO frequency range
Reply #1 - Dec 1st, 2017, 2:36am
 
The VCO range should cover all possible variations including process variations and temperature variation. A thumb rule is +/- 10 % around your  center frequency. If noise is too much of a concern then reduce the (varactor) fine tuning range and use coarse tuning to cover this range
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