PACES: A Partition-Centering-Based Symmetry Placement for Binary-Weighted Unit Capacitor Arrays

Chien Chih Huang, Jwu E. Chen, Chin Long Wey

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Capacitor matching influences linearity performance, which is a critical measure of analog-to-digital converters (ADCs). Various placement techniques have been proposed to eliminate both systematic and random mismatches of capacitor pairs. However, a placement technique that eliminates capacitor mismatches may not result in good linearity performance for successive-approximation-register ADCs because their linearity performance is related to the accuracy of their binary-weighted continued ratio. This paper addresses the critical problem of placement estimation based on ratio mismatch M, overall correlation coefficient L, and performance metrics. A low M and a high L value do not imply higher linearity performance. Therefore, we propose a partition-centering-based symmetry placement algorithm for the layout considering parasitic capacitance matching. The experimental results show that the proposed placement approach can achieve higher linearity performance and a shorter placement generation time compared with the conventional approach.

Original languageEnglish
Article number7463524
Pages (from-to)134-145
Number of pages12
JournalIEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
Issue number1
StatePublished - Jan 2017


  • Analog placement
  • binary-weighted continued ratio
  • capacitance ratio mismatch
  • spatial correlation coefficient
  • successive-approximation-register (SAR) analog-to-digital converter (ADC)
  • unit capacitor (UC) array placement


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