Design of a Novel Ultra-Low Power Time-Domain Temperature Sensor
Abstract
This paper proposed a novel ultra-low power time-domain temperature sensor. It consists of two current generators including one constant-with-temperature (CWT) current reference generator, relaxation oscillator, separation circuit and digital circuit system. Both of current generators are used to drive the oscillator to produce a signal whose high level duration is complementary to absolute temperature, and low level duration is temperature-independent. The separation circuit is used to separate the high level duration and low level duration. The digital circuit system can quantify the separation circuit output and make a subtraction, and therefore obtain digitized temperature information. The temperature sensor is designed using a standard 0.18 μm CMOS process. The simulation results show that it can measure temperature from 0°C to 60°C The power consumption of the complete system is 86.79 nW at 25°C The maximum conversion speed is 52 Sa/s under 1 V voltage supply.
Jian Guan
PhD Student
My research interests include the design of solar cells and energy harvesting circuits.
Zhipeng Li
PhD Student
My research interests include circuit design of image sensors and energy harvesting circuits.
Feng Yan
PhD Student
My research interests include circuit design of analog front end for biomedical applications and sensor interfaces.
Kangkang Sun
PhD Student
My research interests include circuit design of analog to digital converter for biomedical applications and SAR ADC.
Jingjing Liu
Associate Professor
My research interests include low-power smart micro-sensor integrated circuit design, image sensors, biomedical sensors, and energy harvesting circuits.