| Citation: |
Shi Hao, Liu Junhua, Zhang Guoyan, Liao Huailin, Huang Ru, Wang Yuangyuan. A Novel Method to Compensate the Sigma-Delta Shaped Noise for Wide Band Fractional-N Frequency Synthesizers[J]. Journal of Semiconductors, 2006, 27(4): 646-652.
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Shi H, Liu J H, Zhang G Y, Liao H L, Huang R, Wang Y A Y. A Novel Method to Compensate the Sigma-Delta Shaped Noise for Wide Band Fractional-N Frequency Synthesizers[J]. Chin. J. Semicond., 2006, 27(4): 646.
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A Novel Method to Compensate the Sigma-Delta Shaped Noise for Wide Band Fractional-N Frequency Synthesizers
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Abstract
A novel method to partially compensate sigma-delta shaped noise is proposed.By injecting the compensation current into the passive loop filter during the delay time of the phase frequency detector(PFD),a maximum reduction of the phase noise by about 16dB can be achieved.Compared to other compensation methods,the technique proposed here is relatively simple and easy to implement.Key building blocks for realizing the noise cancellation,including the delay variable PFD and compensation current source,are specially designed.Both the behavior level and circuit level simulation results are presented. -
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