一个数字辅助电热锁频环路

S. M. Kashmiri, K. Makinwa
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引用次数: 9

摘要

提出了一种数字辅助电热锁频环路(FLL),其输出频率由体硅的温度相关热扩散率决定。与以前的工作相反,它的噪声带宽是由数字滤波器而不是模拟滤波器定义的。这避免了对外部电容器的需求,从而实现了完全的CMOS集成。在没有修整的情况下,在0.7µm CMOS工艺中实现的输出频率从- 55°C到125°C的范围约为±0.3% (3σ)。这相当于温度传感误差约为±0.7°C (3σ)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A digitally-assisted electrothermal frequency-locked loop
A digitally-assisted electrothermal frequency-locked loop (FLL) is presented, whose output frequency is determined by the temperature-dependent thermal diffusivity of bulk silicon. In contrast to previous work, its noise bandwidth is defined by a digital, rather than an analog, filter. This obviates the need for external capacitors, thus enabling full CMOS integration. Without trimming, an implementation in a 0.7µm CMOS process achieves an output frequency spread of about ±0.3% (3σ) from −55 °C to 125 °C. This corresponds to a temperature sensing inaccuracy of about ±0.7 °C (3σ).
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