MICROWAVE MODEL OF AN OPTICALLY CONTROLLED GAAS-MESFET

The effects of optical illumination on the microwave characteristics o f a conventional MESFET have been studied theoretically. The effect of the changes in the intrinsic parameters of the device under illuminat ion has been utilized to calculate the Y parameters of the device at m icrowave frequencies. The small-signal equivalent circuit of the devic e in the illuminated condition has been obtained with the various comp onents determined from the Y parameters. The attractive feature of the present model is that it is fully compatible with commonly used circu it simulation packages like SPICE. (C) 1995 John Wiley & Sons, Inc.