An all-CMOS low supply voltage temperature sensor front-end with error correction techniques

This paper presents an all-CMOS temperature sensor front-end operating at low supply voltage. The front-end includes a reference voltage generator and a proportional-to-absolute-temperature (PTAT) voltage generator. In order to minimize the errors due to various mismatches, error correction techniques including gain boosting, dynamic element matching, dynamic offset cancellation and clock boosting have been investigated. Detailed analysis and simulation have been presented. Furthermore, experimental results with 0.5 μm implementation demonstrated that the lowest supply voltage is 1.1 V for the reference voltage generator and 1 V for the PTAT voltage generator over the temperature range of -55°C to 125°C with acceptable performance for a CMOS-based temperature sensor front-end. The effectiveness of the error correction techniques are also demonstrated experimentally.