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The Designer's Guide Community Forum › Design › RF Design › Capacitive loading of input probe pad+coax cable+sig gen

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Capacitive loading of input probe pad+coax cable+sig gen (Read 2756 times)

mixed_signal Senior Member Offline Posts: 183	Capacitive loading of input probe pad+coax cable+sig gen May 24^th, 2014, 5:03am Hi, I am using RF probes to introduce 2.4GHz to a matching network (ONCHIP) from a signal generator. I want to know approx. parasitic capacitive loading (paralle C from input to ground) at the input due to signal generator+coax+rF probes. I want to design matching network accordingly to account for this.
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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: Capacitive loading of input probe pad+coax cable+sig gen Reply #1 - May 26^th, 2014, 11:49am For those frequencies you need to design a 50 ohm terminated cable connection on your board and input port on the IC that is designed to handle that 50 ohm cable signal. By probe methods? Not with any accuracy.
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mixed_signal Senior Member Offline Posts: 183	Re: Capacitive loading of input probe pad+coax cable+sig gen Reply #2 - May 26^th, 2014, 10:35pm Hi loose-electron By probe methods I mean RF probes for probing die (onchip). I have pads on silicon where the probe can be landed. I am worried about the loading of the RF probe? Is it capacitive ? approx. value?
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loose-electron Senior Fellow Offline Best Design Tool = Capable Designers Posts: 1638 San Diego California	Re: Capacitive loading of input probe pad+coax cable+sig gen Reply #3 - May 30^th, 2014, 3:07pm probes available for a probe station are pretty well specified relative to their input loads. Generally I avoid probes to a wafer its just to awkward to do and does not yield good repeatable results.
Back to top	Jerry Twomey www.effectiveelectrons.com Read My Electronic Design Column Here Contract IC-PCB-System Design - Analog, Mixed Signal, RF & Medical IP Logged

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