Abstract
This paper presents proof-of-concept measured results from CMOS hyperbolic-sine (sinh) filters fabricated in a commercially available 0.35µm CMOS technology. Results from two chips are reported: a practical sinh integrator and a high order (8th) notch filter dedicated to 50/60Hz noise rejection and synthesized by means of the proposed integrator. Linearity, frequency and noise measurements are reported. The notch frequency of the 8th order filter can be tuned over almost two decades. Its attenuation exceeds 70dB for the target frequency range of 20–60Hz and its dynamic range (for THD<4%) amounts to 89dB while consuming 8µW from a 2V power supply level. For an increased power consumption of 74µW its dynamic range (for THD<4%) exceeds 100dB.
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