MHT2012N is a dual stage LDMOS amplifier. It includes integrated quiescent current temperature compensation circuit. VGS1 and VGS2 are reference current inputs for this circuit. VGS1 determines quiescent current of the first stage and VGS2 of the second one.
In NXP reference design, the reference currents are generated using 4.7kOhm resistors as current sources. VG1 and VG2 voltage should be tuned to achieve required quiescent drain currents through VDS1 and VDS2 pins.
Note. MHT2012N model kit for ADS does not emulate temperature compensation circuit. The model's Vgs1 and Vgs2 represent internal gate voltages rather than reference current inputs. In contrast to real device, Vgs1 and Vgs2 pins are high impedance inputs and do not sink current. You should connect these pins to voltage sources and tune these voltages to achieve required drain currents.
Have a great day,
Pavel
TIC
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