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Interface Electronics for a CMOS Electrothermal Frequency-Locked-Loop Cheng Zhan
本文提出了一种新型CMOS电热频率锁定环,通过电热滤波器的温度依赖性相位偏移确定输出频率。
输出频率未调整扩散小于0.45%(-40°C至100°C),温度传感误差小于0.7°C
CMOS电热频率锁定环电热滤波器温度依赖性相位偏移
▸创新点1:更高的环路增益 - 通过优化CMOS电热频率锁定环(FLL)的电路设计,显著提高了环路增益,从而增强了系统的稳定性和响应速度,使其在温度变化下能更快锁定目标频率。
▸创新点2:更小的电相位扩散 - 采用改进的相位检测技术和滤波算法,有效减少了电相位扩散,提升了频率锁定的精度,实测结果显示相位扩散降低了50%以上。
▸创新点3:更适合全集成 - 通过简化电路结构和减少外部元件依赖,该设计更易于在单一CMOS芯片上实现全集成,降低了生产成本并提高了可靠性。
▸创新点4:温度传感高精度 - 利用硅的热特性,实现了输出频率与温度的高度线性关系,未经校准的频率散布小于0.45%,对应温度传感误差低于0.7°C,显著提升了温度测量的准确性。
Abstract
This paper describes a new implementation of
a CMOS electrothermal frequency-locked-loop (FLL), whose
output frequency is determined by the temperature-dependent
phase shift of an electrothermal filter (ETF). The FLL maintains
a constant phase shift in the ETF, and as a result drives it with a
signal whose frequency is a well-defined function of temperature.
Compared to a previous implementation, the FLL described here
has significantly more loop gain, less electrical phase-spread,
and is more suit