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

摘要

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 over 0.06 Hz–950 Hz bandwidth. The total harmonic distortion (THD) of the LNA is 0.15% for a 10 input. The ECG front-end consumes 8.49 from a 1 V supply and achieves an ENOB up to 8 bits. The core area of the proposed front-end is , fabricated in a 0.18 CMOS technology.