1.8 V, 25.9 nW, 91.86 dB dynamic range second-order lowpass filter tunable in the range 4-100 Hz
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Date
2019
Authors
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Publisher
Institution of Engineering and Technology kvukmirovic@theiet.org
Abstract
A second-order lowpass Butterworth filter with tunable bandwidth capable of offering a dynamic range of 91.86 dB operating on a supply voltage of 1.8 V is presented. The proposed filter is based on a sub-threshold source follower. The transistor bias currents are switched to enable the bandwidth tuning in the range 4-100 Hz. A proportional to absolute temperature (PTAT) current reference circuit helps to keep the bandwidth intact across process, voltage and temperature variations. The filter, designed in 0.18 ?m standard CMOS process, consumes 25.9 nW making it a potential candidate for portable biomedical applications. © The Institution of Engineering and Technology 2019.
Description
Keywords
Bandwidth, Butterworth filters, Medical applications, Threshold voltage, Bandwidth tuning, Biomedical applications, Current reference circuits, Process , voltage and temperatures, Proportional to absolute temperature, Source followers, Standard CMOS process, Tunable bandwidth, Low pass filters
Citation
IET Circuits, Devices and Systems, 2019, 13, 7, pp. 1086-1092