Title :
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
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;
Conference_Titel :
Circuits and Systems (ISCAS), 2013 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-5760-9
DOI :
10.1109/ISCAS.2013.6571970
