⚡ 本页包含 AI 生成的分析内容，仅供参考
该论文提出了一种20位无时钟DAC，采用分段电压模式R-2R架构，实现了亚ppm线性度、7.5nV/√Hz低噪声和0.05ppm/°C低温漂，适用于医疗成像和科学仪器等对噪声和稳定性要求极高的应用。
Douglas Chisholm1, Denise T. Lee1 Analog Devices, Edinburgh, United Kingdom, Analog Devices, Wilmington, MA 1 2 DACs without continuous clocking are often favored in applications such as medical imaging and scientific instrumentation. The DACs in these high-precision systems are commonly endpoint-calibrated. After this calibration, a non-ideal DAC contributes three main sources of error: noise, temperature drift, and INL. The segmented voltage-mode R-2R DAC is an attractive architecture for reducing the first two of these error sources. Resistor Johnson noise is fixed by the DAC’s code-independent output resistance, which is readily lowered by the combination of several parallel segments. The complete signal path can be built using opamps that have a minimal noise gain of unity. This architecture also benefits from inherently zero endpoint error, avoiding any gain or offset drift over temperature.
Roddy C. McLachlan1, Alan Gillespie1, Michael C. W. Coln2,