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A High-Performance Fully Differential Charge Pump for Frequency Synthesizer Applications

Yang Zhenyu, Tang Zhangwen and Min Hao

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Abstract: A fully differential charge pump for a frequency synthesizer is proposed.The pump eliminates the effect of channel-length modulation and makes the charging and discharging currents match perfectly in a wide output range to minimize the ripple of the control voltage.A common-mode feedback circuit with rail-to-rail input range is employed to ensure a large unrestricted swing of the charge pump.The proposed fully differential charge pump is designed and fabricated in a 1.8V SMIC 0.18μm CMOS mixed-signal process;the chip area is about 450μm×280μm;and the power dissipation is 1mW.A reference spur level of -73dBc is achieved in the worst case,satisfying the performance of the frequency synthesizer.

Key words: frequency synthesizerfully differential charge pumpcurrent matchingreplicaripplespur

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    Received: 18 August 2015 Revised: 08 July 2007 Online: Published: 01 December 2007

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      Yang Zhenyu, Tang Zhangwen, Min Hao. A High-Performance Fully Differential Charge Pump for Frequency Synthesizer Applications[J]. Journal of Semiconductors, 2007, In Press. Yang Z Y, Tang Z, Min H. A High-Performance Fully Differential Charge Pump for Frequency Synthesizer Applications[J]. Chin. J. Semicond., 2007, 28(12): 1993.Export: BibTex EndNote
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      Yang Zhenyu, Tang Zhangwen, Min Hao. A High-Performance Fully Differential Charge Pump for Frequency Synthesizer Applications[J]. Journal of Semiconductors, 2007, In Press.

      Yang Z Y, Tang Z, Min H. A High-Performance Fully Differential Charge Pump for Frequency Synthesizer Applications[J]. Chin. J. Semicond., 2007, 28(12): 1993.
      Export: BibTex EndNote

      A High-Performance Fully Differential Charge Pump for Frequency Synthesizer Applications

      • Received Date: 2015-08-18
      • Accepted Date: 2007-06-04
      • Revised Date: 2007-07-08
      • Published Date: 2007-11-28

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