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  • Title: An ECG recording front-end with continuous-time level-crossing sampling.
    Author: Li Y, Mansano AL, Yuan Y, Zhao D, Serdijn WA.
    Journal: IEEE Trans Biomed Circuits Syst; 2014 Oct; 8(5):626-35. PubMed ID: 25330494.
    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.
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