Abstract
This paper presents the design of a low-latency, highly linear current-steering DAC for use in continuous-time ADCs. A detailed analysis of equivalent unary-weighted current-steering DAC topologies in terms of mismatch, noise, and output-impedance related distortion is carried out. From this analysis, we propose a tri-level DAC design that achieves 12-bit static linearity and is suitable for implementation in a continuous-time ADC architecture. To reduce output-impedance related distortion, the design combines DAC slice impedance matching with a proposed compensation technique. By incorporating the tri-level DAC in a continuous-time ADC architecture, the technique demonstrates ~ 8dB improvement in DAC dynamic performance at high frequencies over the Nyquist-band at 100MS/s. The DAC has been verified by simulation results in TSMC 1.2V 65nm CMOS technology.
Original language | English (Ireland) |
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Article number | 9094170 |
Pages (from-to) | 34-47 |
Number of pages | 14 |
Journal | IEEE Open Journal of Circuits and Systems |
Volume | 1 |
DOIs | |
Publication status | Published - 2020 |
Keywords
- Current-steering
- DACs
- DNL
- HD3
- INL
- SFDR
- Thermal noise
- Tri-level