It seems they took Win's circuit way too carelessly:
According to the schematic, they use SN75LVC2G14 as the Schmitt trigger. The datasheet says V_T+ is 2.2--3.7V (@5.5V), while V_T- is 1.4--2.5V and deltaV_T is 0.7--1.4V. This would be good enough for *some* deadtime in the case of a Si part, but here they aim at precise 7ns for the GaN. How could they achieve good results over a wide temperature range in production, i.e. without individual tweaking the RC values? Spice says the deadtime will vary in the range of 4..8.5ns, not including the propagation delay. Including, it gives 5.5..12.8ns.
Is this based on some clever temperature self-compensation, or do they not care?
Best regards, Piotr
Version 4 SHEET 1 940 680 WIRE 480 -224 448 -224 WIRE 384 -208 320 -208 WIRE 480 -80 448 -80 WIRE 320 -64 320 -208 WIRE 384 -64 320 -64 WIRE 176 32 160 32 WIRE 272 32 240 32 WIRE 480 64 448 64 WIRE 160 80 160 32 WIRE 160 80 96 80 WIRE 272 80 272 32 WIRE 320 80 320 -64 WIRE 320 80 272 80 WIRE 384 80 320 80 WIRE 160 112 160 80 WIRE 176 112 160 112 WIRE 272 112 272 80 WIRE 272 112 256 112 WIRE 96 128 96 80 FLAG 96 208 0 FLAG 320 144 0 FLAG 480 64 LMG5200_INPUT_BUFFER FLAG 480 -80 TTL_LOWER_BOUND FLAG 480 -224 TTL_UPPER_BOUND SYMBOL voltage 96 112 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value PULSE(0 5 0 10p 10p 500n 1u) SYMBOL schottky 240 16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 -54 27 VTop 2 SYMATTR InstName D1 SYMATTR Value BAS40-04HM SYMATTR Description Diode SYMATTR Type diode SYMBOL res 272 96 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 47 SYMBOL cap 304 80 R0 SYMATTR InstName C1 SYMATTR Value 100p SYMBOL Digital\\schmitt 384 16 R0 WINDOW 3 6 -11 Left 2 SYMATTR InstName A1 SYMATTR Value Vhigh=5 Vt=1.86 Vh=0.2 Trise=10p Tfall=10p SYMBOL Digital\\schmitt 384 -128 R0 WINDOW 3 6 -11 Left 2 SYMATTR InstName A2 SYMATTR Value Vhigh=5 Vt=3.1 Vh=0.6 Trise=10p Tfall=10p SYMBOL Digital\\schmitt 384 -272 R0 WINDOW 3 6 -11 Left 2 SYMATTR InstName A3 SYMATTR Value Vhigh=5 Vt=1.8 Vh=0.4 Trise=10p Tfall=10p TEXT 62 232 Left 2 !.tran 10u