Title :
Low-voltage wide-range built-in current sensing for system-on-chip applications
Author :
Vahedi, Haleh ; Muresan, Radu ; Gregori, Stefano
Author_Institution :
Sch. of Eng., Guelph Univ., Ont.
Abstract :
This paper presents a low-voltage on-chip current sensor that is well suited for cryptosystem applications, as well as testing, and battery lifetime improvement. The sensing method is based on an improved current mirror with a compensating circuit and a dynamic control loop that provides wide range and high linearity while introducing a small voltage drop. The voltage drop across the sensor remains below 60 mV (less than a single VDSsat) for a wide current range of 0.5 to 10 mA and the linearity is better than 98%. The total power dissipation for 5 mA is 700 muW. The proposed circuit has been designed and simulated in 0.18-mum CMOS process with 1.8 V supply
Keywords :
CMOS analogue integrated circuits; current mirrors; electric current measurement; electric sensing devices; low-power electronics; system-on-chip; 0.18 micron; 0.5 to 10 mA; 1.8 V; CMOS process; battery lifetime improvement; compensating circuit; cryptosystem application; current mirror; dynamic control loop; low-voltage on-chip current sensor; system-on-chip application; voltage drop; wide current range; Batteries; Circuit testing; Cryptography; Decision support systems; Life testing; Linearity; Mirrors; Power dissipation; System-on-a-chip; Voltage control;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Conference_Location :
Covington, KY
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594233
