DocumentCode :
3224887
Title :
A new 12-bit fully differential SAR ADC for wireless implantable neural recording system
Author :
Liang, Y.C. ; Wu, Z.H. ; Li, B.
Author_Institution :
Inst. of Microelectron., South China Univ. of Technol., Guangzhou, China
fYear :
2009
fDate :
25-27 Dec. 2009
Firstpage :
399
Lastpage :
402
Abstract :
Low power, small volume and high acquisition precision are always important in the internal module of wireless implantable neural recording system. This paper describes the design and implementation of a new successive approximation (SAR) ADC to meet the unique requirements of wireless implantable neural recording system. In the designed new ADC, a fully differential structure is used to avoid the crosstalk from the digital circuit to the converter. Instead of using all capacitive DAC traditionally, a resistor array Sub-DAC is interpolated to increase the resolution and to avoid a large capacitor array. Moreover, after every conversion period, the sleep mode is introduced to reduce power consumption. Designed in a 0.35-¿m CMOS process with a 3.3-V supply, the entire ADC, working at 20 kS/s, consumes 38 ¿W power and occupies an area of 0.17 mm2.
Keywords :
CMOS integrated circuits; analogue-digital conversion; biomedical electronics; medical signal processing; neurophysiology; prosthetics; 12-bit fully differential SAR ADC; CMOS process; crosstalk; large capacitor array; power 38 muW; reduce power consumption; successive approximation ADC; voltage 3.3 V; wireless implantable neural recording system; Capacitance; Circuit simulation; Delay effects; Driver circuits; Integrated circuit interconnections; MOS devices; Microelectronics; Power dissipation; Threshold voltage; Wires;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electron Devices and Solid-State Circuits, 2009. EDSSC 2009. IEEE International Conference of
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-4297-3
Electronic_ISBN :
978-1-4244-4298-0
Type :
conf
DOI :
10.1109/EDSSC.2009.5394233
Filename :
5394233
Link To Document :
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