Besirli, MustafaTüre, KerimBarrettino, Diego RubenBeghetti, MauriceMattavelli, MarcoDehollain, CatherineMaloberti, Franc2022-01-102022-01-102022-01-102021-10-0710.1109/BioCAS49922.2021.9644941https://infoscience.epfl.ch/handle/20.500.14299/184346This paper presents an energy-efficient, duty-cycled, and spinning excitation bridge-to-digital converter (BDC) suitable for measuring the pulmonary artery pressure of heart failure patients with an implantable system. The duty-cycled bridge uses resistances of 6.2 kΩ and, with a supply of 1.2 V, consumes 0.4 nJ excitation energy. A novel spinning method is applied to the bridge and the capacitive DAC simultaneously in such a way to achieve an offset-independent digital output and to eliminate the need for complex instrumentation amplifiers with offset-reduction techniques or calibration. The SAR ADC fabricated in 0.18-µm CMOS consumes 19 nW at 1.2 V. With a sampling rate of 1 kS/ s , the converter achieves the ENOB of 9.2 bits.text::conference output::conference proceedings::conference paper