A low-glitch binary-weighted DAC with delay compensation scheme

Fang Ting Chou, Chia Min Chen, Chung-Chih Hung*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

This paper presents a high-speed, low-glitch, and low-power design for a 10-bit binary-weighted current-steering digital-to-analog converter (DAC). Instead of using large input buffers to drive a lot of current switches and re-timing latches, the proposed design uses variable-delay buffers with a compact layout to compensate for the delay difference among different bits, and to reduce glitch energy from 132 to 1.36 pV s during major code transitions. The measured spurious free dynamic range (SFDR) has been improved over 10 dB, as compared to DACs without variable-delay buffers. At 250 MS/s update rate, the proposed DAC achieves 56 dB SFDR for 0.67 MHz output frequency and 49 dB SFDR for 94 MHz output frequency with 50 Ω termination. For static performance, the measured integral nonlinearity (INL) and differential nonlinearity (DNL) is less than 1.6 and 1.8 LSB, respectively. The proposed DAC can be used in various applications in industry, including digital video, digital TV, wireless communication system, etc. This chip was implemented in TSMC 1P6M 0.18 μm CMOS technology and dissipates 19 mW from a single 1.8 V power supply.

Original languageEnglish
Pages (from-to)277-289
Number of pages13
JournalAnalog Integrated Circuits and Signal Processing
Volume79
Issue number2
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Binary-weighted
  • Current-steering DAC
  • Digital-to-analog converter (DAC)
  • Glitch reduction

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