A voltage scaling 0.25–1.8 V delta-sigma modulator with inverter-opamp self-configuring amplifier

Author

Yoshioka, Kazuaki ; Toyama, Yoshio ; Jyo, T. ; Ishikuro, Hiroki

Author_Institution

Dept. of Electron. & Electr. Eng., Keio Univ., Yokohama, Japan

fYear

2013

fDate

19-23 May 2013

Firstpage

809

Lastpage

812

Abstract

A 2nd order discrete time (DT) ΔΣ modulator with very wide supply voltage range of 0.25-1.8 V is presented. An inverter-opamp self-configuring amplifier (IOSA) is proposed with sufficient gain through sub-threshold to strong inversion region. The amplifier senses the supply voltage and automatically configures either to operate as an inverter or an opamp. The prototype ADC fabricated in 180nm CMOS achieved SNDR of 53dB at a supply voltage of 0.3V and a best FoM of 0.09 pJ/step. At 1.8 V supply the modulator achieves SNDR 61dB and operates down to 0.25V.

Keywords

CMOS integrated circuits; analogue-digital conversion; delta-sigma modulation; logic gates; low-power electronics; operational amplifiers; CMOS integrated circuit; analog-digital converter; discrete time delta-sigma modulator; inverter-opamp self-configuring amplifier; second order delta-sigma modulator; size 180 nm; voltage 0.25 V to 1.8 V; voltage scaling; CMOS integrated circuits; Gain; Inverters; Low voltage; Modulation; Threshold voltage; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2013 IEEE International Symposium on

Conference_Location

Beijing

ISSN

0271-4302

Print_ISBN

978-1-4673-5760-9

Type

conf

DOI

10.1109/ISCAS.2013.6571970

Filename

6571970