A dual-compensated charge pump with reduced current mismatch

  • Authors:

  • Dong-Keon Lee;Jeong-Kwang Lee;Hang-Geun Jeong

  • Affiliations:

  • Division of Electronics and Information Engineering, Chonbuk National University, Jeonju, Jeonbuk, South Korea;Division of Electronics and Information Engineering, Chonbuk National University, Jeonju, Jeonbuk, South Korea;Division of Electronics and Information Engineering, Chonbuk National University, Jeonju, Jeonbuk, South Korea

  • Venue:
  • CISST'10 Proceedings of the 4th WSEAS international conference on Circuits, systems, signal and telecommunications
  • Year:
  • 2010

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Abstract

The charge pump in a phase-locked loop is a key element in determining reference spurs of the VCO output signal. To reduce reference spurs, the current mismatch in the charge pump must be minimized. This paper presents a dual compensation method to reduce the current mismatch. Current matching characteristics can be achieved with less than 0.15% difference in the pump current over the charge pump output voltage range of 0.25-1.45V at 1.8V. The proposed charge pump was realized in a 0.18µm CMOS process. The measured reference spur is lower than -71dBc.