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The paper presents a novel scheme to implement fractional-order filters for ultra-low frequency applications. The scheme is based on the intrinsic property of the fractional-order filters that the pole frequency can be scaled down to sub-hertz by employing the order if the normal pole frequency of the filter is designed slightly less than one. This is in contrast to the scaling techniques employed...
Most biopotential readout front-ends rely on the - lowpass filter (LPF) for forefront signal conditioning. A small realizes a large time constant ( ) suitable for ultra-low-cutoff filtering, saving both power and area. Yet, the noise and linearity can be compromised, given that each cell can involve one or several noisy and nonlinear - conversions...
The behavior of a frequency divider circuit using a Λ-type negative differential resistance (NDR) circuit, which is composed of Si-based metal-oxide-semiconductor field-effect-transistor (MOS) and SiGe-based heterojunction bipolar transistor (HBT) devices, is studied. This frequency divider is mainly made of a MOS-HBT-NDR circuit, an inductor, and a capacitor. The operation is based on the long-period...
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