Patent ID: 11933836
Assignee: ROHM CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 0:
1. A method of measuring a device parameter, the method comprising:
repeatedly measuring a gate-source voltage (or gate-emitter voltage) of a switching element in a switching transient state thereof while switching an external gate resistance for the switching element among m resistance values (where m is an integer of three or more); and
while representing an internal gate resistance and a plateau voltage of the switching element by Rgin and Vp respectively and using the m resistance values of the external gate resistance and corresponding m voltage values of the gate-source voltage (or gate-emitter voltage) as Rg(k) and Vgs(k) respectively (where k=1, 2 . . . m), performing fitting of an equation Vgs(k)=Rg(k)/(Rg(k)+Rgin) x Vp, thereby to derive the internal gate resistance Rgin or the plateau voltage Vp of the switching element.