In a well designed, stable circuit, the LDMOS is sequencing indifferent. One can bring up the RF, Gate and Drain tabs in any sequence and the part will amplify as originally intended. A designer must check that the design remains stable in power transient conditions.
In the case of NXP reference circuit, the quiescent currents is determined by separate gate voltage supply. The recommended quick start sequence prevents possibility of unwanted high drain current when the gate supply voltage is too high and if it starts before the drain supply.
Have a great day,
Pavel
TIC
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