This paper deals with the trade-off between conversion time and power in nW-power capacitance-to-digital converters (CDCs). The CDC used in this work operates at nW power and low voltage down to 0.3 V without the need for any additional circuitry, references, or voltage regulation. It is built on swappable oscillators and takes advantage of the delay-power flexibility of dual-mode logic. Its self-calibration corrects PVT changes and mismatches at any point in the chip lifecycle, doing away with the necessity for cutting during testing. A CDC's test chip in 180nm demonstrates that its power consumption can be dynamically modified from 1.37 nW down to 418 pW at a conversion time down to hundreds of ms, making it suited for harvesting systems with a very tight power budget and changing power sources.

Capacitance-to-digital converter in dual-mode logic: power consumption vs conversion time trade-off / Aiello, Orazio; Crovetti, PAOLO STEFANO. - In: ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING. - ISSN 0925-1030. - STAMPA. - (2023). [10.1007/s10470-023-02173-9]

Capacitance-to-digital converter in dual-mode logic: power consumption vs conversion time trade-off

Paolo Stefano Crovetti
2023

Abstract

This paper deals with the trade-off between conversion time and power in nW-power capacitance-to-digital converters (CDCs). The CDC used in this work operates at nW power and low voltage down to 0.3 V without the need for any additional circuitry, references, or voltage regulation. It is built on swappable oscillators and takes advantage of the delay-power flexibility of dual-mode logic. Its self-calibration corrects PVT changes and mismatches at any point in the chip lifecycle, doing away with the necessity for cutting during testing. A CDC's test chip in 180nm demonstrates that its power consumption can be dynamically modified from 1.37 nW down to 418 pW at a conversion time down to hundreds of ms, making it suited for harvesting systems with a very tight power budget and changing power sources.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2980603