I. Introduction
Static frequency divider is often used as benchmark for high speed digital integrated circuits (IC), for it usually works at highest data rate in a digital IC [1]. The highest operating frequency of Static frequency divider is often determined by the device process, which is the very foundation of every IC design. Among different materials and devices, InP/InGaAs DHBT is a suitable candidate for high speed digital ICs, because of its high electron drift velocity and vertical device structure. [2] In recent years, aggressive scaling has been achieved on InP based DHBT, maximum oscillation frequency has reached 1THz [3].