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A Solid-state oscillator design with Freescale LDDMOS devices is presented. The power booster technique of oscillator with two devices is presented as well. The single device oscillator can deliver up to 157W CW power at 2.45GHz with better than 43% efficiency and has a high-Q feedback ring which provides stable resonating frequency. The dual-devices oscillator can deliver 310W CW power at 2.4GHz with 46% efficiency. One of device in this dual-device oscillator operates as an oscillator and another one operates as a Class C amplifier. Both oscillators are housed in compact rooms including M&C circuits, a spatial advantage makes oscillator suitable for portable microwave ovens.