Approach to the design of transmission-type injection-locked microwave oscillators through behavioral block modeling

Abstract

In this work, an attempt is made toward the development of a systematic design method for the performancedriven dimensioning of the various elements comprising the structure of modern transistor-based microwave injectionlocked oscillators with transmission-type topologies (TILOs). The proposed approach is based on the use of appropriate diakoptics of the various circuit blocks into a matched environment, and their behavioral modeling in the fundamentalfrequency dynamical complex envelope domain with the help of standard circuit and E.M. simulation CAD tools. This will permit, in the end, to obtain closed-form expressions for the main TILO performances in terms of the design parameters, thus permitting their optimization as a function of system-level specifications. The practical validity of the method developed was tested by designing and building a single transistor 10.75GHz core-TILO with a wide locking bandwidth (>4MHz) at the low nominal input power level targeted (-20dBm).