Title :
A highly linear, Sigma-Delta based, sub-Hz high-pass filtered ExG readout system
Author :
Mohan, Rachit ; Hiseni, Senad ; Serdijn, Wouter A.
Author_Institution :
Biomed. Electron. Group, Delft Univ. of Technol., Delft, Netherlands
Abstract :
Integrating time constants of the order of a few seconds is one of the main bottlenecks in the design of biomedical chips. To achieve a low cut-off frequency with 60 dB linearity, mixed-signal feedback utilizing the properties of a ΣΔ ADC is proposed. To verify the performance, a 10-bit ΣΔ modulator with the proposed technique is designed to be implemented in 0.18 μm CMOS AMS technology. The design is verified by means of simulations in Cadence using RF spectre.
Keywords :
CMOS integrated circuits; biomedical electronics; high-pass filters; readout electronics; sigma-delta modulation; ΣΔ ADC; CMOS AMS technology; RF spectre; biomedical chip design; highly linear readout system; mixed-signal feedback; sigma-delta readout system; size 0.18 mum; subhertz high-pass filtered exg readout system; word length 10 bit; Charge pumps; Cutoff frequency; Frequency modulation; Linearity; Noise; Signal resolution;
Conference_Titel :
Circuits and Systems (ISCAS), 2013 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-5760-9
DOI :
10.1109/ISCAS.2013.6571812
