The manuscript describes the design and implementation of a low-power, fully differential switched-capacitor ΣΔ modulator in STM 90-nm CMOS technology, for sensor interface applications. With the aid of an accurate behavioral model, the power consumption is minimized without sacrificing the effective resolution. Through the optimization of single-stage integrators, with feed-forward summation, and using a class-A OTA op-amp with local positive feedback, a total power consumption of 50-μW from a 1.2-V power supply is achieved. The modulator reaches a peak SNR of 94-dB and a noise floor of 8.6-μV-rms over a 250-Hz signal bandwidth. The proposed design is one of the first modulator implemented in a 90-nm CMOS and achieving a 16-bit effective resolution with a 1.5-pJ/conv. figure-of-merit.

Low-power 3rd order ΣΔ modulator in CMOS 90-nm for sensor interface applications / Giuffredi, Luca; Pietrini, Giorgio; Ronchi, Marco; Magnanini, Alessandro; Boni, Andrea. - ELETTRONICO. - (2015), pp. 1-4. ((Intervento presentato al convegno International New Circuits and Systems Conference (NEWCAS) [10.1109/NEWCAS.2015.7182044].

Low-power 3rd order ΣΔ modulator in CMOS 90-nm for sensor interface applications

GIUFFREDI, Luca;PIETRINI, Giorgio;MAGNANINI, Alessandro;BONI, Andrea
2015-01-01

Abstract

The manuscript describes the design and implementation of a low-power, fully differential switched-capacitor ΣΔ modulator in STM 90-nm CMOS technology, for sensor interface applications. With the aid of an accurate behavioral model, the power consumption is minimized without sacrificing the effective resolution. Through the optimization of single-stage integrators, with feed-forward summation, and using a class-A OTA op-amp with local positive feedback, a total power consumption of 50-μW from a 1.2-V power supply is achieved. The modulator reaches a peak SNR of 94-dB and a noise floor of 8.6-μV-rms over a 250-Hz signal bandwidth. The proposed design is one of the first modulator implemented in a 90-nm CMOS and achieving a 16-bit effective resolution with a 1.5-pJ/conv. figure-of-merit.
978-1-4799-8893-8
978-1-4799-8893-8
Low-power 3rd order ΣΔ modulator in CMOS 90-nm for sensor interface applications / Giuffredi, Luca; Pietrini, Giorgio; Ronchi, Marco; Magnanini, Alessandro; Boni, Andrea. - ELETTRONICO. - (2015), pp. 1-4. ((Intervento presentato al convegno International New Circuits and Systems Conference (NEWCAS) [10.1109/NEWCAS.2015.7182044].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2795353
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