Switching characteristics analysis of GaAs HBTs using eye diagram

This paper presents the use of eye diagram as a functional tool to study the response of InGaP/GaAs double heterojunction bipolar transistor (DHBT) in digital environment. In this work, sensitivity analysis carried out to study the switching characteristics and to quantify the performance of the devices through the eye diagrams has been presented for the first time. The discussion includes the responses of the device to timing errors especially at higher data rates and hence the digital signal transmission limitations. Also, the effects of various small signal parameters on the switching characteristics and their limitations on the device performance are discussed.