Design and Analysis of an Ultrahigh-Speed Glitch-Free Fully Differential Charge Pump with Minimum Output Current Variation and Accurate Matching Academic Article uri icon


  • An ultrahigh-speed fully differential charge pump with minimum current mismatch and variation is proposed in this brief. A mismatch suppression circuit is employed to minimize the mismatch between the charging and discharging currents, which minimizes the steady-state phase error in a phase-locked loop (PLL). A variation suppression circuit is proposed to minimize output current variation with the change of output voltage, which reduces the variation of the bandwidth in a PLL. Techniques are proposed to suppress both low-speed glitches and high-speed glitches in the output current to allow glitch-free operation of the charge pump with ultrafast input pulses. The differential charge pump is designed and simulated under the power supply of 3.3 V in TSMC 0.35-µm CMOS technology to verify the effectiveness of the proposed techniques. © 2006, IEEE. All rights reserved.

altmetric score

  • 3

author list (cited authors)

  • Cheng, S., Tong, H., Silva-Martinez, J., & Karsilayan, A. I.

citation count

  • 49

publication date

  • September 2006