Products > Test Equipment

Affordable <200MHz PDN analysis / impedance measurement hardware?

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inevitableavoidance:

--- Quote from: axb on November 11, 2024, 11:59:33 pm ---
--- Quote from: inevitableavoidance on October 28, 2024, 02:57:41 pm ---I ended up designing a little adapter board for the Analog Discovery series!

Here's the board measuring a low impedance capacitor array:

--- End quote ---

Hi,
Could you please share the schematic?

--- End quote ---

Available on my github page: https://github.com/remidavidkoster/Redako-PDNAnalyzer

axb:
Super! Thanks!
I only see one uncertainty. In my WaveForms (AD3) I don't have the selectable configuration you indicate, I only have DUT-RES-GND.

mawyatt:
Very impressive results with the low Z range covered :-+

Curious why you selected Tantalums rather than Polymer or Aluminum Electrolytic Capacitors for the coupling/decoupling, size maybe?

Best

inevitableavoidance:

--- Quote from: mawyatt on November 12, 2024, 02:41:01 pm ---Very impressive results with the low Z range covered :-+

Curious why you selected Tantalums rather than Polymer or Aluminum Electrolytic Capacitors for the coupling/decoupling, size maybe?

Best

--- End quote ---

Hey Mawyatt,

Thanks! Pretty stoked with it myself as well.

Indeed size, and with that inductance. The shunt is 500mΩ. If I would use a capacitor with an equivalent series inductance of 10nH I'd see an additional impedance of 1.57Ω in series with the rest of the circuit at 25MHz, limiting the current I'd be able to get through with a factor of 4, and with that reducing the voltage I'd read back on the second sense channel with a similar factor of 4.

Keeping the capacitor and its inductance as small as possible allows most current at high frequencies, keeping my sense voltages as high as possible there.

inevitableavoidance:

--- Quote from: axb on November 12, 2024, 09:41:57 am ---Super! Thanks!
I only see one uncertainty. In my WaveForms (AD3) I don't have the selectable configuration you indicate, I only have DUT-RES-GND.

--- End quote ---

I think you should be able to select that one, and switch the scope channels around somewhere else. Then you effectively have the same configuration.

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