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THERMAL SENSOR CIRCUIT WITH TUNABLE CONVERSION GAIN AND OFFSET

IP.com Disclosure Number: IPCOM000172980D
Publication Date: 2008-Jul-23

Publishing Venue

The IP.com Prior Art Database

Abstract

Thermal sensors are included in many integrated circuits to provide circuit temperature information: for example, for thermal shutdown protection system, or temperature monitoring during different operating states or manufacturing steps. In many on chip analog and digital systems, this function is a secondary feature of the circuit and the information is digitized by a generic on chip ADC (analog to Digital Converter) that is not dedicated to it. The proposed solution adapts the temperature dependent voltage generated by a current biased semiconductor diode junction to fit a given input dynamic range of a generic ADC, over a specified temperature range. It optimizes temperature measurement condition by optimizing the ADC quantization step at low cost: very few components are necessary, and it can be easily implemented in standard silicon technology.