Title :
Low power current mode ADC for CMOS sensor IC
Author :
Agarwal, A. ; Kim, Y.B. ; Sonkusale, S.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
Current-mode algorithmic pipelined analog-to-digital converters (ADC) are suitable for sensor applications due to their area and power advantage at low resolutions. In applications of distributed sensing using redundant sensors, the speed and the resolution of the ADC is less important than the energy per bit conversion. Such performance was achieved by using the current-mode technique with transistors operating in the sub-threshold region. Both sub-threshold and current mode techniques allow for low-voltage and low-power operation. An improved current-mode, 6-bit, 125 kHz algorithmic ADC was designed for an integrated sensor in 0.18 μm technology. The power consumption of the ADC is under 6 μW and less than 8 pJ per bit.
Keywords :
CMOS integrated circuits; analogue-digital conversion; current-mode circuits; distributed sensors; integrated circuit design; low-power electronics; microsensors; power consumption; ADC circuit design; CMOS sensor IC; distributed sensing; energy per bit conversion; integrated sensor; low power current mode ADC; low-voltage operation; pipelined analog-to-digital converters; power consumption; sub-threshold region; Algorithm design and analysis; CMOS integrated circuits; Capacitance; Chemical sensors; Circuit synthesis; Detectors; Energy consumption; Energy resolution; Intelligent sensors; Voltage; ADC; Current Mode; Low-power; Low-voltage; Sensors; Sub-threshold;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1464655
