I am trying to make the ns pulse generator in Linear's App Note 98. The basic idea of the circuit is to use comparators to produce a delayed pulse and an inverted pulse, and then use an AND gate to produce a pulse. It uses a resistor and capacitor to form the delay lines. It specs 8pF caps and the circuit also has a variable resistor in it.
be in the RF "side" of the circuit. Still, I am planning to use surface mount components to reduce RF problems, and I was thinking of purchasing some "High frequency" ceramic caps, as Mouser has some from AVX and Murata. I am wondering whether these parts RF properties will be so different from that of "standard" ceramic caps as to cause problems? (The app note and associated articles do not specify the caps beyond 8pF).
Also, I was planning to use a surface mount pot to reduce RF problems with the leads. Since pots are relatively large compared to other components, I was wondering if it is likely to cause problems. Would wrapping it in AL foil help?
Thanks