Patent ID: 7933753

Claim:
A modeling circuit, comprising: a field-effect transistor; a first current source having a first terminal coupled to a drain of the field-effect transistor; a first bipolar transistor having a collector coupled to the drain of the field-effect transistor, an emitter coupled to a source of the field-effect transistor, and a base coupled to a second terminal of the first current source; a second current source having a first terminal coupled to the source of the field-effect transistor; a second bipolar transistor having a collector coupled to the source of the field-effect transistor, an emitter coupled to the drain of the field-effect transistor, and a base coupled to a second terminal of the second current source; a first substrate resistor coupled between the base of the first bipolar transistor and a backside of a semiconductor substrate; and a second substrate resistor coupled between the base of the second bipolar transistor and the backside of the semiconductor substrate.