Products > Test Equipment
Picotest Injector Teardowns
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Wolfgang:
Testing PDNs is a tough test because of extremely low impedances here. Tests leads from your injector to the board are simply a no-no. Another challenge is that modern FPGAs draw 10s of amps at *very* low voltages. To make this move, you need to inject several Amps right at the DUT, asking for a very compact, solder-in solution for the injector and the same for the probe. This smells like copper-base PCBs, very modern switching MOSFETs in small cases, super-compact, all SMD designs, and so on. A funny challenge, but certainly not easy. An alternative for directly soldering the injector and the probes into the circuit is ultra-low inductance coax.
Peter_Clements:
Dear All,

I was wondering if anybody made it to a next stage and actually made a real PCB of a current injector and did some measurements.

@Wolfgang, your remarks are pertinent and I wondered if you had the time and courage to improve the design?

Looking forward to continue reading!

Peter
Jay_Diddy_B:
Peter_Clements,

Welcome to the forum.

I never built the circuit that I simulated in this thread. I did build and test a similar device in this thread:

https://www.eevblog.com/forum/projects/high-bandwidth-current-injector-for-impedance-measurements/


Regards,

Jay_Diddy_B
Wolfgang:
Hi Peter,

I confess I did not do a lot in the field of power supply impedance measurement lately. The reasons are:
- finished my PhD in the field of precision oscillators and this consumed a lot of time
- For the PSUs I have, my injectors worked fine. I mostly work with low noise linear stuff.
- Making superfast, high amperage injectors is only possible with a bag of special tricks and components.
  With my old eyes and shaky hands, I leave the development of these for the pros with appropriate manufacturing capabilities.
- If you have a specific question just ask. I try to answer as good is I know.

Best regards
  Wolfgang
Peter_Clements:
Thank you all for the information!
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