Microwave Oscillator Design from Load Cycle Optimisation, Application to MMIC GaAs Mesfet Oscillator

A non linear microwave oscillator design and optimisation procedure, using the facilities of a commercial harmonic balance simulator, is presented. The oscillator is transformed to a reflection amplifier and the optimisation consists mainly of obtaining an optimal form of the intrinsic load cycle of the transistor used. This procedure is applied to the design of a monolithic microwave integrated oscillator. Simulations and experimental results are presented The oscillator exhibits a 11.8 GHz carrier frequency, with a 13.75 dBm output power and a single side band phase noise around -75 dBc/Hz at 100 kHz offset from the carrier.