Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
ha,I just learned a very quick method to test the varactor.
see the attachment.
do ac analysis and plot the ac magnitude of the current in the iprobe.
the current at frequency f : I=2*pi*f*C*V.
so the capacitor can be calculated.