Design and analysis of an ultrahigh-speed glitch-free fully differential charge pump with minimum output current variation and accurate matching
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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-m CMOS technology to verify the effectiveness of the proposed techniques. 2006, IEEE. All rights reserved.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
author list (cited authors)
Cheng, S., Tong, H., Silva-Martinez, J., & Karsilayan, A. I.
complete list of authors
Cheng, Shanfeng||Tong, Haitao||Silva-Martinez, Jose||Karsilayan, Aydin Ilker