A high-gain acquisition system with very large input range

Authors:
Robert Rieger;Yen-Yow Pan
Affiliations:
Electrical Engineering Department, National Sun Yat-Sen University, Kaohsiung, Taiwan;Vanguard International Semiconductor Corporation, Hsinchu, Taiwan and Electrical Engineering Department, National Sun Yat-Sen University, Kaohsiung, Taiwan
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Year:
2009

Citing 1
Cited 2

Fudamentals of Digital Logic with VHDL Design

Fudamentals of Digital Logic with VHDL Design

Measuring the uniqueness and variety of analog circuit design features

Integration, the VLSI Journal
Analog circuit design space description based on ordered clustering of feature uniqueness and similarity

Integration, the VLSI Journal

Quantified Score

Hi-index	0.00

Visualization

Abstract

A signal acquisition system is presented for the recording of small signals in the presence of low-frequency interference. In a conventional design, high-pass filters precede the input stage to remove the impeding signals. However, filters limit the recording bandwidth, can lead to long settling time after disturbance, and potentially valuable information about the interfering signal is removed. Also, the required large components are impractical for a fully integrated solution. In this paper, a flexible, low-cost, filterless system is proposed and demonstrated, which extends the available input range to accommodate interference instead of rejecting it. An integrated system using digitally controlled floating batteries to compensate for interference at the amplifier input is presented. A digital postprocessing algorithm suitable for integration is proposed and evaluated. Measured results of the acquisition front-end realized in 0.35 µm CMOS technology confirm a more than sevenfold extension of the original input range and the usable dynamic range. The system is further verified using electrocardiography as a typical biomedical application.