DocumentCode :
3417739
Title :
Interface circuit design and implementation for MEMS pressure sensor in tire pressure monitoring system
Author :
Xiao Yu ; Liji Wu ; Xiangmin Zhang ; Bo Li
Author_Institution :
Tsinghua Nat. Lab. for Inf. Sci. & Technol., Tsinghua Univ., Beijing, China
fYear :
2012
fDate :
Oct. 29 2012-Nov. 1 2012
Firstpage :
1
Lastpage :
3
Abstract :
This paper presents an interface circuit for MEMS pressure sensor in tire pressure monitoring system. For the application of handling different output zeropoints of different sensors and adjusting the output common mode voltage for flexible use, a dedicated 3-Opamp instrument amplifier(In-Amp) and a cyclic ADC is adopted. The In-Amp is fabricated in a 0.35μm automotive electronic 2P4M BCD process. With a gain of 60, the test results show that the DC CMRR is 77.5dB and the input noise voltage at 1KHz is 96.8nV/√Hz. The cyclic ADC has an 8 bit resolution and the sample rate is set as 4KHz. The post-simulation result shows that the SFDR is 71.8dBc and SNDR is 49.4dB. The ENOB is calculated as 7.9 bit. The whole sensor interface circuit and an In-Amp with EMI design have been taped out in the 0.35μm automotive electronic 2P4M BCD process.
Keywords :
analogue-digital conversion; automotive electronics; electromagnetic interference; microsensors; operational amplifiers; pressure measurement; pressure sensors; tyres; EMI design; In-Amp; MEMS pressure sensor; automotive electronic 2P4M BCD process; cyclic ADC; dedicated 3-opamp instrument amplifier; flexible use; frequency 4 kHz; interface circuit design; output common mode voltage; size 0.35 mum; tire pressure monitoring system; Electromagnetic interference; Micromechanical devices; Mirrors; Monitoring; Noise; Temperature sensors; Tires;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2012 IEEE 11th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4673-2474-8
Type :
conf
DOI :
10.1109/ICSICT.2012.6467717
Filename :
6467717
Link To Document :
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