4 ms·
Biasing is indeed non-trivial, and most designs require temperature compensation to keep drain current constant. In fact, it's pretty easy to fry a GaN part wit
by csirac2 11y ago
Biasing is indeed non-trivial, and most designs require temperature compensation to keep drain current constant. In fact, it's pretty easy to fry a GaN part without proper bias sequencing at power-on and off. At least it is with the parts I'm using.
Edit: parts like MAX881R [1] make it pretty easy though :)
[1] http://datasheets.maximintegrated.com/en/ds/MAX881R.pdf http://datasheets.maximintegrated.com/en/ds/MAX881R.pdf
- madengr 11y agoI've used the MAX881 for some lower power GaAs, but it's limited to a few mA gate current. TI has an opamp I used that can drive capacitive loads with +/- 30 mA, so it makes a good gate driver, whilst allowing a decent amount of gate bypass capacitance. For temp comp I have found once you get the temp vs IDS curve, it's identical for devices within a lot, and only need to offset for pinchoff, which varies device to device within the same lot.