I need design a 10~20pf varactor on chip, between a 27MHz signal to GND.
Anyone knows how to design it?
Can I use the standard N+/Psub diode as varactor?
Thanks for your reply!
which range is huge? diode or 20pf?
how about the pull range of N+/Psub diode? Do you have any C/V curve?
Could you explain more clearly?