p-fingers in high-speed monolithic switching circuits

This paper describes a novel structure of "p-fingers" in high-speed monolithic switching circuits. The p-fingers improve the switching speed, the saturation characteristic, and the statistical distribution of the speed parameter. The experiments for evaluating monolithic circuits with various p-finger configurations are discussed. Both the saturation characteristic and the switching speed are functions of the separation between the p-finger and the base. Considering the speed trade-off between the number of p-fingers, around the base and the stray capacitance due to the excess p-fingers, we conclude that the best p-finger configuration is the one in which two p-fingers were diffused on both sides of the base.