A novel low phase noise positive feedback type push-push oscillator

A novel method for phase noise reduction in a push-push oscillator is described. The push-push oscillator consists of two positive feedback type push-push oscillators and two RF multipliers used for the noise reduction. The phase noise of the oscillator can be improved because the multipliers fix the phase difference between the oscillation signals of the push-push oscillators. The second harmonic oscillator is designed and fabricated in K-Band. The output power is +5.83 dBm at 25.6 GHz with the phase noise of -115.5 dBc/Hz at 1MHz offset frequency.