Driving a Wideband Low Noise VCO from a Low Voltage PLL
By Dennis Colin, Micronetics VCO Group
Editor's Note: Due to the large number of equations in this article we have made a low-resolution PDF available for you to download. Also, because of an error on the last page, we are re-running the last paragraph of the article in its entirety below.
In Figure 4, and neglecting Ro noise (below filter corner, PLL attenuates noise; above corner, filter cap does so), the op amp output noise is 4.355 nV/Hz. L(fos)E is then