Switched Capacitor Circuit Realization of Sigma-Delta ADC for Temperature Sensor
In this article the basic operating principles of CMOS smart temperature sensors are demonstrated. In this article a CMOS temperature sensor with sigma-delta analog to digital converter (ADC) is proposed, which have widespread use due to their low cost, l
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Abstract In this article the basic operating principles of CMOS smart temperature sensors are demonstrated. In this article a CMOS temperature sensor with sigma-delta analog to digital converter (ADC) is proposed, which have widespread use due to their low cost, low power consumption and small size. The sigma-delta ADC was implemented by the switch capacitor circuit. For the implementation of sensor high-performance signal conditioning circuits are required as interfacing circuit and for these bias circuits have been designed. The accuracy of sensor is mainly limited by offset and 1/f noise, which is canceled by the autozeroing circuit with the help of switch capacitor circuit. The sensor circuit is designed with biasing subcircuit for controlling the curvature correction.
Keywords Temperature sensor Threshold voltage Sigma-delta Analog to digital converter (ADC)
Switch capacitor circuit
1 Introduction Many years ago people had great desire to know about temperature. However, many types of temperature sensors are invented, but in recent years the automatic operated instrument demanded for temperature controller [1, 2]. In aerospace to reduce the fuel consumption in central heating and cooling system is essential for monitoring the temperature. To communicate with computer, a digital signal is required and this is done by Analog to digital converter (ADC) [3]. This kind of Abhishek Pandey (&) M. Javed Khan D. Prasad Vijay Nath S.S. Solanki Department of Electronics and Communication Engineering, Birla Institute of Technology Mesra, Ranchi 835215, Jharkhand, India e-mail: [email protected] L.K. Singh Department of Physics and Electronics, Dr. RML Avadh University, Faizabad 224001 UP, India © Springer Science+Business Media Singapore 2017 R. Singh and S. Choudhury (eds.), Proceeding of International Conference on Intelligent Communication, Control and Devices, Advances in Intelligent Systems and Computing 479, DOI 10.1007/978-981-10-1708-7_134
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temperature sensor is called integrated smart temperature sensor, which consists of temperature sensor cell and ADC. It was attempted in mid-seventieth century which is widely used in industrial, aerospace, biomedical application. With the development of integrated circuit, it was also the time to develop the BJT-based temperature sensor. It was much accurate than other types of temperature sensor. On the basis of literature report, the smart temperature sensor further designed into parasitic BJT-based temperature sensor, delay-inverter-based temperature sensor and threshold voltage-based temperature sensor [4–6]. The CMOS smart temperature sensor described here perfectly fits in this low-cost, high-performance, and low-power market. It has its application in the automotive industry, where it is meant to measure the temperature in car tires. This is first for safety reasons and second to compensate for the temperature sensitivity of a pressure sensor which is also located in the tire. Designing of smart temperature se
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