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Low Phase Noise Amplifier and Oscillator Using Feed-Forward Technique at 10 GHz



Archita Hati, Craig W. Nelson, David A. Howe


We discuss the performance of a feed-forward amplifier (FFA) at 10GHz. The feed-forward method is primarily used to suppress intermodulation distortion in amplifiers to suppress up-converted near-DC noise. The main amplifier in this configuration is a low-noise array of eight amplifiers in parallel and having a phase noise of 165 dBc/Hz at f= 10 kHz. By implementing a feed forward scheme, we are able to suppress this noise as well as close to carrier noise, by at least another 10 dB. This improved performance surpasses that of other present low noise microwave amplifiers. We discuss this exceptional performance in the context of trade offs with other amplifier properties and specifications. We also construct a 10 GSz oscillator using an air dielectric resonator and the FFA as the loop amplifier. The phase modulated (PM) noise of this particular oscillator is either better than or comparable with the PM noise of several classes of commerical oscillators. Additionally, the AM noise performance is superior to existing oscillators.
Proceedings Title
IEEE International Frequency Control Symposium
Conference Dates
June 5-7, 2006
Conference Title
Proceedings of the IEEE International Frequency Control Symposium


air dielectric cavity oscillator, amplitude modulated noise, carrier suppression, feed forward amplifier, phase modulated noise


Hati, A. , Nelson, C. and Howe, D. (2005), Low Phase Noise Amplifier and Oscillator Using Feed-Forward Technique at 10 GHz, IEEE International Frequency Control Symposium (Accessed April 14, 2024)
Created June 1, 2005, Updated February 17, 2017