Title :
A high resolution two-stage sigma-delta ADC based on a new calibration method
Author :
Harb, Adnan ; Sawan, Mohamad ; Haroun, Baher
Author_Institution :
Dept. of Electr. & Comput. Eng., Ecole Polytech., Montreal, Que., Canada
Abstract :
This paper describes a new high resolution Analog-to-Digital Converter (ADC) dedicated to implantable biomedical sensors. The ADC is based on a two stage over-sampling sigma-delta (ΣΔ) architecture. The three main features of the proposed ADC are high resolution, low area and reduced energy consumption. An adaptive algorithm is employed to optimize the above mentioned parameters. It allows the calibration of the analog and digital components mismatching and the internal employed Digital-to-Analog Converter (DAC). The simulations show that the proposed converter reaches an 18 bits resolution for a 25 kHz bandwidth running at a 1.6 MHz over-sampling frequency
Keywords :
adaptive signal processing; analogue-digital conversion; biomedical electronics; calibration; circuit analysis computing; medical signal processing; prosthetics; sigma-delta modulation; signal sampling; 1.6 MHz; 25 kHz; adaptive algorithm; calibration method; high resolution two-stage sigma-delta ADC; implantable biomedical sensors; low area; mismatching; over-sampling frequency; parameter optimization; reduced energy consumption; simulations; two stage over-sampling sigma-delta architecture; Adaptive algorithm; Analog-digital conversion; Bandwidth; Biosensors; Calibration; Delta-sigma modulation; Digital-analog conversion; Energy consumption; Energy resolution; Frequency conversion;
Conference_Titel :
Circuits and Systems, 1996., IEEE 39th Midwest symposium on
Conference_Location :
Ames, IA
Print_ISBN :
0-7803-3636-4
DOI :
10.1109/MWSCAS.1996.594101
