A High-Resolution Capacitance-to-Digital Converter based on Iterative Discharging
H. Fan (TU Delft - Electrical Engineering, Mathematics and Computer Science)
M. A P Pertijs – Mentor
Berry Buter – Mentor
F. Sebasatiano – Coach
M. Spirito – Coach
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Abstract
This work focuses on the improvement of a capacitance-to-digital converter (CDC) based on iterative discharging. Time-domain interpolation is applied on the CDC. With such technology, a high-resolution CDC can be achieved while its fully digital feature can be kept. The proposed CDC achieves a resolution of 2.8fF and a FoM of 1.32pJ/step at 5.5pF capacitance. A MEMS capacitive pressure sensor has been bonded to the chip and the output with varying capacitance has been checked.