Impatt oscillator design

Includes bibliographical references (page 56)This thesis describes a technique for design of IMPATT diode oscillators. The design technique is applicable to any circuit configuration that can be modeled by lumped elements.\ud To demonstrate the design technique, a coaxial oscillator utilizing a single step impedance transformer is designed and fabricated. A design curve for determining the transformer length and characteristic impedance is presented. In addition, design curves for modeling the diode mount parasitics are also included. With the use of these curves, an equivalent network is derived.\ud The equivalent network is then analyzed to determine the effect of various parameter changes. The results of the analysis are illustrated by the use of device-circuit diagrams.\ud The oscillator is then fabricated and tested. The test results show the variation of output power as a function of bias current, threshold current and transformer impedance. Also, the frequence of oscillation is found to be a function of transformer length. These test results are explained in terms of the equivalent network model