Title :
A 0.45V-to-2.7V inductive-coupling level shifter
Author :
Takatsu, Keita ; Niitsu, Kiichi ; Shidei, Tsunaaki ; Miura, Noriyuki ; Kuroda, Tadahiro
Author_Institution :
Keio Univ., Yokohama, Japan
Abstract :
This paper presents a 0.45V-to-2.7V level shifter utilizing inductive coupling. Since primary and secondary coils are AC-coupled, each coil can be biased at arbitrary voltage independent from the conversion level difference. This enables both the primary and the secondary circuits to operate at the optimal operating region. In addition, the inductive coupling itself can provide an additional intermediate level-shifting by exploiting a coil-turn ratio between the primary and the secondary coils. As a result, wide-range voltage level conversion can be achieved. Test chip measurement in 65nm CMOS demonstrates voltage level conversion from 0.45V to 2.7V. Compared to a conventional level shifter, the primary voltage is reduced by 0.24V. In addition, the energy-delay product is reduced to 1/8.
Keywords :
CMOS integrated circuits; coupled circuits; flip-flops; power convertors; CMOS; coil turn ratio; inductive coupling level shifter; secondary coils; size 65 nm; voltage 0.45 V; voltage 2.7 V; voltage level conversion; CMOS integrated circuits; Coils; Couplings; Delay; Layout; Random access memory; Semiconductor device measurement;
Conference_Titel :
Solid State Circuits Conference (A-SSCC), 2010 IEEE Asian
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8300-6
DOI :
10.1109/ASSCC.2010.5716591
