eejli
Advanced Member level 4
In the lab, my PLL locks to different frequency with different board.
For one board, PLL locks to the right frequency=Fref*divider ration N, say 1.5GHz. But for another board the PLL locks to a slightly different frequency such as 1.5GHz+100kHz(always 100kHz offset). This is a fractional N PLL.
What could be the wrong source? The VCO is tunable from 1GHz to 2GHz.
Thanks.
For one board, PLL locks to the right frequency=Fref*divider ration N, say 1.5GHz. But for another board the PLL locks to a slightly different frequency such as 1.5GHz+100kHz(always 100kHz offset). This is a fractional N PLL.
What could be the wrong source? The VCO is tunable from 1GHz to 2GHz.
Thanks.