By Vrefad I mean the ref adc, pin 42 of AD7293. Here is the schematic related to AD7293 that I'm using:
It is not the evaluation board, it's custom made.
Hello. I am designing pulsed power amplifier with 4 GaN HEMTs. I want to use AD7293 current controller in closed-loop mode and generate pulse sequences by changing HEMT's gate voltages. Pulse characteristics: rise/fall time < 2 us and pulse width = 100…
Unfortunately, HMC981 cannot support the biasing requirement of GaN amplifiers, where around 28V Vdd and -4V Vgg is required. Please refer to the application note AN-1363 for further details on bias controllers.
For now we do not have an…