A Continuous-Time BJT-Based Temperature-to-Digital Converter

Master thesis (2020)

Authors

M. Mohamed Mahmoud Saad Hassan Saad Electrical Engineering, Mathematics and Computer Science

Contributors

K.A.A. Makinwa Microelectronics (supervisor 1)
Faculty
Electrical Engineering, Mathematics and Computer Science
Copyright: © 2020 Mohamed Mohamed Mahmoud Saad Hassan Saad
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Published Date

24-11-2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

This thesis presents a BJT-based CMOS temperature-to-digital converter (TDC). With a continuous-time readout, the TDC avoids the kT/C noise limit incurred by previous discrete-time (switched-capacitor) TDCs. An energy-efficient BJT front-end generates single PTAT and CTAT currents for being digitized by a delta-sigma modulator through a linear charge-balancing operation. Simulated in a standard 0.18 um CMOS process, the TDC achieves a (3*sigma) inaccuracy of 0.13'C from -40'C to 125'C after one-point trimming. Moreover, the TDC achieves 4 mK resolution in a 202 millisecond conversion time, while consuming 4.9 uW. This corresponds to a resolution FoM of 15.7 pJ.K2.