EEVblog 1557 - Micsig SigOFIT Optical Fibre Probe + GaN Experiment

Review of the new Micsig SigOFIT Optical Fibre oscilloscope probe, including a practical demonstation of the incredible CMRR range of opticallly isolated probing of a 300V GaN transistor driver circuit.
And a direct comparison with the HVP-70 high voltage differential probe to show you the incredible game changing difference optical fibre probes make.

https://www.micsig.com/SigOFIT/

CMRR Explained video:    • EEVblog 1521 - Common Mode Rejection ...  

Forum: https://www.eevblog.com/forum/blog/ee...

Links:
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
https://www.infineon.com/dgdl/Infineo...
Demo board: https://www.digikey.com/en/products/d...

00:00 - Micsig SigOFIT Optical Fibre Probe vs Active FET
02:25 - High Voltage Differential Limitation and why you might need an Optical Fibre probe
03:25 - Galvanically isolated, and power-over-fibre
04:39 - Comparison with the Tek IsoVu & Lecroy DL-ISO
05:55 - The CMRR is AMAZING!
07:15 - A look at the SigOFIT probe
10:04 - An optical fibre probe is NOT a high voltage differential probe!
10:40 - Practical example using a 600V Gallium Nitride GaN circuit demo
11:39 - What is a Gallium Nitride (GaN) Transistor?
13:23 - GaN / HEMT, and Silicon Carbide SiC Transistors
14:21 - IGOT60R070D1 600V GaN datasheet & Half Bridge switching configuration
15:30 - This is IMPOSSIBLE with a regular probe!
19:07 - GaN EiceDRIVER chip
19:54 - The practical GaN test setup
23:10 - Remote MXO4 scope control to take measurements
24:36 - High side GaN power transistor measurement with the SigOFIT
26:26 - Here is where the CMRR MAGIC happens!
27:41 - Comparison with HVP-70 High Voltage Differential Probe
28:45 - Look how the High Voltage Differential Probe is just horrible here!
31:56 - Baseline High Voltage Differential probe ringing vs SigOFIT
32:21 - Noise measurement
36:27 - Conclusion

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