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Microwave oscillator phase noise reduction using negative resistance compensation

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2 Author(s)
V. M. T. Lam ; Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon, Hong Kong ; P. C. L. Yip

Two microwave oscillators at a free-running frequency of approximately 800 MHz are designed. Both were designed to have the same feedback factors; the difference lies in the output loading circuit. By using the inverted common collector (ICC) configuration, a stable negative resistance is generated. This negative resistance is then used to compensate for the loss in the feedback path. Hence, a zero resistance loaded oscillator is implemented. A comparative study with experimental support confirmed that the zero loaded oscillator has a 6 dB and 18 dBc improvement in the phase noise and second harmonic rejection, respectively.

Published in:

Electronics Letters  (Volume:29 ,  Issue: 4 )