Title :
Implementation of current-to-voltage converter with wide dynamic range and its application
Author :
Park, Jae-Hyoun ; Hahn, Cheol-Koo ; Yoon, Hyung-Do
Author_Institution :
Green Energy Res. Center, Korea Electron. Technol. Inst., Seongnam, South Korea
Abstract :
A current-to-voltage converter (CVC) with wide dynamic range and good linearity is presented, which consists of a trans-impedance amplifier (TIA), an adjusting current generator, and two ADCs. Main algorithm of the CVC is two-step conversion. First, a rough location of an input current is traced using one ADC, a coarse-ADC with N-bit resolution, and the input current shifts to the linear region of the TIA by current subtraction. Next, the other ADC converters the TIA output which corresponds to the shifted current. This converter is implemented using a 0.35 ¿m CMOS technology. Measurement results indicate that a maximum linear input current is enlarged by 2N times.
Keywords :
CMOS integrated circuits; analogue-digital conversion; mixed analogue-digital integrated circuits; operational amplifiers; ADC converters; CMOS mixed-signal technology; N-bit resolution; TIA; adjusting current generator; coarse-ADC; current subtraction; current-to-voltage converter; maximum linear input current; size 0.35 mum; transimpedance amplifier; Amperometric sensors; CMOS technology; Circuit synthesis; Current measurement; Dynamic range; Linearity; Signal design; Signal generators; Signal resolution; Voltage; CVC; TIA; adjusting current; linearity; wide dynamic range;
Conference_Titel :
SoC Design Conference (ISOCC), 2009 International
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5034-3
Electronic_ISBN :
978-1-4244-5035-0
DOI :
10.1109/SOCDC.2009.5423832
