基于运行模式切换的低不匹配误差高动态范围CMOS智能温度传感器

提出了一种新的电路结构，通过两种运行模式的切换，可以在降低CMOS智能温度传感器不匹配误差的同时，保证输出有尽可能高的动态范围。理论分析得出，相对于传统结构，新结构的不匹配误差能减小66%以上。0.18μm工艺环境下的仿真结果表明，在-55℃~125℃的温度范围内，输出能达到90%左右的动态范围，和Pertijs提出的改进结构相比，有较大幅度的提高。芯片实测结果在-10℃~100℃的温度范围内证实了这个结论。

A Low Mismatch Error and High Dynamic Range CMOS Smart Temperature Sensor Based on Operational Modes Switching

A new circuit structure which can switch between two operational modes is proposed to reduce the mis-match errors of CMOS smart temperature sensors and ensure a high dynamic range of the output. The new structure can reduce more than 66%of the mismatch error in contrast to traditional circuit by theoretical analysis. The simula-tion between -55 ℃ and 125℃ based on 0.18μm process shows that a dynamic range of about 90% which is lar-ger than the output of Pertijs’ structure can be acquired using this new structure. This conclusion is verified by chip testing result between -10 ℃ and 100 ℃.