CMOS Wilson-Widlar total-current temperature sensor [articol]

Abstract

This paper describes a new integrated-on-silicon circuit, made of two cross-connected classical current mirrors. This temperature sensor can be seen in the first place by a simple interconnection, serial with the load resistance, and good sensitivity and linearity. We analyze the performance of this scheme for different types of used integrated resistors, with positive, zero and negative temperature coefficient. It highlighted the possibility of achieving a better overall performance when using a combination of NTC and PTC resistors type. We followed the maximal variation of total output current with temperature. A design with maximum slope is presented, having an error of 4.05% between analytical and simulated slope. Sensor performances are improved: 0.514%/°C percentage slope, low power consumption of 42.9μA at 20°C, supply regulation parameter of 7897ppm/V at 3.5V and a total variation of percentage slope with process of only 3.66%.