An ECG Recording Front-End With Continuous-Time Level-Crossing Sampling

Author

Yongjia Li ; Mansano, Andre L. ; Yuan Yuan ; Duan Zhao ; Serdijn, Wouter A.

Author_Institution

Sect. Bioelectronics, Delft Univ. of Technol., Delft, Netherlands

Volume

8

Issue

5

fYear

2014

fDate

Oct. 2014

Firstpage

626

Lastpage

635

Abstract

An ECG recording front-end with a continuous- time asynchronous level-crossing analog-to-digital converter (LC-ADC) is proposed. The system is a voltage and current mixed-mode system, which comprises a low noise amplifier (LNA), a programmable voltage-to-current converter (PVCC) as a programmable gain amplifier (PGA) and an LC-ADC with calibration DACs and an RC oscillator. The LNA shows an input referred noise of 3.77 μVrms over 0.06 Hz-950 Hz bandwidth. The total harmonic distortion (THD) of the LNA is 0.15% for a 10 mVPP input. The ECG front-end consumes 8.49 μW from a 1 V supply and achieves an ENOB up to 8 bits. The core area of the proposed front-end is 690 ×710 μm2, fabricated in a 0.18 μm CMOS technology.

Keywords

CMOS integrated circuits; RC circuits; analogue-digital conversion; biomedical electronics; electrocardiography; harmonic distortion; low noise amplifiers; mixed analogue-digital integrated circuits; oscillators; CMOS technology; ECG recording front end; LC-ADC; LNA; PGA; PVCC; RC oscillator; analog-digital converter; calibration DAC; continuous time level crossing sampling; low noise amplifier; power 8.49 muW; programmable gain amplifier; programmable voltage-current converter; size 693 mum; size 710 mum; total harmonic distortion; voltage 1 V; voltage-current mixed mode system; Calibration; Capacitors; Cutoff frequency; Electrocardiography; Feedback loop; Noise; Resistors; Analog-to-digital conversion; ECG recording; asynchronous ADC; biomedical recording system; level-crossing ADC; level-crossing sampling; offset calibration; pseudo-resistor; voltage-to-current converter;

fLanguage

English

Journal_Title

Biomedical Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

1932-4545

Type

jour

DOI

10.1109/TBCAS.2014.2359183

Filename

6923480