This isn't lead inductance per say, but since we've drifted a
bit to what can contribute to resonances:
3 - The orientation of the cap as mounted to the PCB can make
a difference too. ATC (American Technical Ceramics -
www.atc-cap.com) uses a mulitlayer construction, and suggests
the plates be oriented perpendicular to the PCB surface. This
reduces component to board capacitance <?>. I've made resonance
problems disappear and VCO's resonate in band by just rotating
the caps from "flat" to "vertical". (ref ATC Bulletin #201,
Recommended Attachment Techniques for Multilayer Capacitors)
ATC is the only manufacturer I know of that has orientation
markings, so maybe others construct theirs differently?
-- --------------------------------------------------------------- Mark Randol, RF Measurements Engineer | Motorola SPS, Inc. (602)413-8052 Voice | M/S EL379 (602)413-4150 FAX | 2100 E. Elliot Road [email protected] | Tempe, AZ 85284 ---------------------------------------------------------------