Thermal simulation and design of a GaAs HBT sample and hold circuit

Methods which are used to predict and measure device temperatures within an IC are described, and their application to the design of an HBT (heterojunction bipolar transistor) sample and hold circuit (S/H) is discussed. A new thermal simulation tool called ThCalc is also described. ThCalc calculates the temperature profile of an IC and runs fast enough to allow calculations on a whole chip.<<ETX>>