Patent ID: 7922389

Claim:
An arrangement for measuring the temperature of a substrate, the arrangement comprising: a sensing transistor on the substrate; and a sensing and control circuit coupled to the sensing transistor, wherein the sensing and control circuit is configured to: provide a voltage to the emitter of the sensing transistor; current drive the base of the sensing transistor with a first current I B1 ; measure a first base emitter voltage V be1 ; current drive the base of the sensing transistor with a second current I B2 such that I B2 /I B1 equals a constant M; measure a second base emitter voltage V be2 ; and determine the temperature T of the substrate using the relationship ΔV be =ηKT/q ln I B2 /I B1 , where ΔV be =V be2 −V be1 , K is Boltzmann's Constant, and emission coefficient η and electron charge q are constants.