A 2 nW 0.25 V 140 dB-FOM Inverter-Based First Order ΔΣ Modulator

In this brief, we introduce an ultra-low voltage, ultra-low power, inverter-based, discrete-time, 1 st order ΔΣ modulator. It exploits an original switched-capacitor integrator to achieve interesting performances with supply voltages as low as 0.25 V. It also employs a clock-boosting technique to im...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2020-09, Vol.67 (9), p.1514-1518
Main Authors: Catania, Alessandro, Benvenuti, Lorenzo, Ria, Andrea, Manfredini, Giuseppe, Piotto, Massimo, Bruschi, Paolo
Format: Article
Language:English
Subjects:
Capacitors
Clocks
CMOS
Delta-sigma converter
energy-harvesting
Gain
inverter-like
Inverters
Low voltage
Modulation
Power consumption
Switches
ultra-low power
ultra-low voltage
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Summary:In this brief, we introduce an ultra-low voltage, ultra-low power, inverter-based, discrete-time, 1 st order ΔΣ modulator. It exploits an original switched-capacitor integrator to achieve interesting performances with supply voltages as low as 0.25 V. It also employs a clock-boosting technique to improve pass-gate operation. A prototype has been designed and produced using a 0.18 μm CMOS process by UMC. The modulator reaches an SNDR of 37.2 dB at a voltage of 0.25 V, with a power consumption of only 2.1 nW, corresponding to a FOM of 140.3 dB. The DC characteristics show an offset of 4.3 mV, a gain error of 2.5% (standard deviations), with an INL of 0.6%.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2020.3005232