A Novel Low Phase Noise Multiple-Device Oscillator Based on the Extended Resonance Technique

In this paper, a new multiple-device oscillator that can provide low phase noise as well as power combination is proposed. The proposed multiple-device oscillator based on extended resonance technique can achieve considerably lower phase noise beyond 1/N predicted reduction. This phase noise reduction is achieved by maximizing group delay in the extended resonance power combining circuits through the optimized transformation of the device gate and drain admittance at each stage. The experimental results show that the phase noise of the four-device extended resonance oscillator is -128 dBc at 1MHz offset frequency, which is a 22 dB improvement over the single-device free running oscillator