Journal of Applied Sciences ›› 2006, Vol. 24 ›› Issue (3): 245-249.

• Articles • Previous Articles     Next Articles

A Novel Automatic Amplitude Control Circuit for VCO

SUN Wen, LUO Lan, WU Xuan, YUN Ting-hua   

  1. National ASIC System Engineering Research Center, Southeast University, Nanjing 210096, China
  • Received:2004-10-26 Revised:2004-12-03 Online:2006-05-31 Published:2006-05-31

Abstract: A new automatic amplitude control circuit for VCO, charge-pump AAC, is presented in this paper.Phase noise performance better than traditional methods is achieved due to its inherent characteristic.Stability analysis based on a small signal model in the S domain is presented.The simulation results indicate that, compared to analog AAC, 14.4 dB phase noise improvement is obtained at 10 kHz offset using the charge-pump AAC.

Key words: automatic amplitude control, phase noise, charge-pump

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