5 mHz highpass filter with -80 dB total harmonic distortions


A absolutely integrated five mHz highpass filter for electrophysiological signal acquisitions is described. Unlike the traditional Gm-C or pseudo-resistor architectures, the proposed continuous-time filter employs this steering technique, that helps decrease the capacitance space and reduce the entire harmonic distortion (THD) simultaneously. This design was fabricated in 0.18 μm CMOS technology. Experimental results indicate that it achieves 23 dB frequency band at 5 mHz, power consumption of 15 μW and input referred noise of three.8 μmVrms. The 280 dB THD was measured at 1 Hz 0.a pair of Vp-p sine wave input.

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