The TLV3604 non-inverting input is driven by a 100-mV, 3-ns pulse with a 2.5-V DC offset (VPULSE).
The LVDS outputs of the TLV3604 (LVDS_H and LVDS_L) are used to drive the inputs of the TLV3601. Since the outputs of the TLV3604 are terminated with a 100-Ω load, the voltage across this load can differentially drive the input of the TLV3601.
The LMG1020 enable pin (INM in the TINA simulation model) is active low and thus can be left grounded to keep the LMG1020 enabled. The series resistances on the outputs follow the LMG1020 5-V, 7-A, 5-A Low-Side GaN and MOSFET Driver For 1-ns Pulse Width Applications data sheet recommended minimum value of 2 Ω in the Typical Applications section. The shorted outputs then drive the gate of the EPC2019 GaN FET (V_GATE). The LMG1020 input is driven by the output of the TLV3601 (TLV3601_OUT).
The GaN FET controls the 10-V supply current through the 1-Ω load. As a safety feature, a Schottky diode was placed in parallel with the load to ensure that the voltage across the load does not exceed 20 V.