ANALYZE AND DESIGN A CASCODE MESFET MIXER

A new and easy-to-use approach to the analysis and design of a cascode or dual-date mixer has been developed and validated through measureme nts made on a fabricated metal-semiconductor-field-effect-transistor ( MESFET) monolithic-microwave-integrated-circuit (MMIC) mixer. Although simplified, it provides useful insight into mixer behavior and permit s calculation of the optimum transistor bias points for maximum interm ediate-frequency (IF) power. The method also can be extended to maximi ze other mixer figures-of-merit such as isolation or intermodulation ( IM).