Self-Balanced Charge Pump with Very Low Phase Error

Xiang Jiang, Xuecheng Zou, Dingzhong Xiao, Sanqing Liu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A self-balanced charge pump (CP) to achieve nearly zero phase error is proposed and analyzed. The proposed topology is based on an additional mirror CP and mirror phase/frequency detector(PFD). The mirror CP and PFD balance charges and generate a bias for the master CP. The proposed CP is designed based on the SMIC 0.25-μm 1P5M CMOS process with a 2.5-V supply voltage. HSPICE simulation shows that even if the mismatch of the PFD were beyond 10%, the charge pump could still keep nearly zero phase error. The proposed CP needs only one side of bias current; the other side of the bias is self-balanced, so it is irrelevant to the current mismatch.

Original languageEnglish
Pages (from-to)111-124
Number of pages14
JournalCircuits, Systems, and Signal Processing
Issue number1
Publication statusPublished - 1 Feb 2006
Externally publishedYes


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