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This thesis elaborates on different methods to accurately measure absolute temperature using CMOS integrated circuits, and to provide output value in a robust and easy to use manner. Proposed circuit comprises of a temperature sensitive relaxation oscillator, a reference oscillator and a counter. Output data are provided in plain binary format. The design is implemented using TSMC 0.25 m mixed-mode process. Both pre-simulation and post-simulation results prove the correctness of this approach. Post-layout simulation shows errors of ±1.5 °C across temperature range of 0 – 120 °C. The layout occupies chip area of 0.38  0.26 mm (excluding I/O pads). During the design process, a considerable number of Perl scripts were developed, to effectively conduct Hspice simulation batches and interpret their results. Although the circuit is usable on its own, it was originally intended to form a building block of a larger system of two oscillators, which would generate a sigma-delta bitstream by employing novel techniques of time-domain digital processing. Such extension is a subject of research of other students, who took on with this subject.

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