A CMOS Temperature Sensor Based on a Chopped Continuous-Time Delta-Sigma Modulator

被引:0
|
作者
Li, Po-Yu [1 ,2 ]
Lee, Wei-En [1 ,2 ]
Lin, Ching-Tzung [3 ]
Wu, Li-Te [3 ]
Lin, Tsung-Hsien [1 ,2 ]
机构
[1] Natl Taiwan Univ, Grad Inst Elect Engn, Taipei, Taiwan
[2] Natl Taiwan Univ, Dept Elect Engn, Taipei, Taiwan
[3] Goertek Inc, Weifang, Peoples R China
关键词
Chopper; continuous-time delta-sigma modulator; finite impulse response filter;
D O I
10.1109/vlsi-dat49148.2020.9196368
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A resistor-based temperature sensor with a 2nd-order 1-bit continuous-time delta-sigma modulator (CTDSM) to realize an energy-efficient temperature sensor is presented. The chopping technique is applied to alleviate the offset and flicker noise of the 1st-stage amplifier. A finite impulse response (FIR) filter is incorporated in the feedback path to mitigate noise fold-back due to chopping operation. The proposed circuit, implemented in 0.18-mu m CMOS, consumes 183.6 mu W from a 1.8-V supply. With a single conversion time of 333.3 mu s, the temperature resolution is less than 3.71 m degrees C (1 delta), which leads to a figure of merit (FoM) of 0.84 pJ degrees C-2. The 3 delta temperature inaccuracy of 8 chips under a range of -40 degrees C to 100 degrees C is 3.8 degrees C after 1-point and batch calibration.
引用
收藏
页数:2
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