Abstract
A low-power low-noise analog front end (AFE) circuit is presented for ECG monitor and QRS feature extraction. For the purpose of low power and small chip area, a 1 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> -order high pass filter with tunable pseudo-resistor and small capacitor is proposed, and a low pass G <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</sup> -C filter using capacitance scaler technique is adopted. A novel calibration circuit is proposed to calibrate the cut-off frequency of the low-pass filter which is sensitive to PVT. The AFE consumes 10μW and input-referred integrated noise in the signal band is 6μV <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rms</sup> .
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