Back to classics. Final VCO is discrete design, but great performance!

The final VCO architecture was selected, designed and tested. It is not an all solid state VCO though. But despite multitude of components, it offers an excellent low noise performance, temperature stability. The tuning range is superior to the original discrete design. Increasing the tuning range reduced drastically the PLL lock time. Now it takes 2 seconds to achieve a full lock on the VDP scan mode change.

No spurs, ultra clean!

NewVCOnoshield108MHz

And a very important property of this design – it all works without a shield!