Key result
Novel OTA-C low-pass filter enables low-noise ECG processing using just ~350 nW of power.
Why the study?
A fifth-order Butterworth OTA-C low-pass filter with multiple-output differential-input OTA structure was proposed to reduce OTA count and improve linearity for ECG applications.
The proposed low-pass filter design for ECG applications reduces the number of required OTAs and achieves low power dissipation with high linearity.
May enable low-power ECG filtering in wearables; leaves open clinical validation of OTA-C designs.
This brief proposes a fifth-order Butterworth operational transconductance amplifier-C (OTA-C) low-pass filter (LPF) with multiple-output differential-input (MODI) OTA structure and metal-insulator-metal capacitors for electrocardiography applications. The current division technology is used as an alternative output pair to provide multiple outputs and achieve high linearity. This technique reduces the number of OTAs of the fifth-order LPF from 11 to 6 as compared with the conventional structure. The design issue of linearity is also considered in the implementation of MODI OTA. The proposed filter is fabricated in a 0.18 μm complementary metal-oxide- semiconductor technology with an area of 0.12 mm2. The LPF achieved a total harmonic distortion of 49.8 dBc under a bandwidth of 50 Hz and input voltage of 86 mVppat a 1-V supply voltage. The total power dissipation is 350 nW.
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Chuan-yu et al. (2017) studied electrocardiography applications. Fifth-order Butterworth OTA-C LPF with MODI OTA structure vs. conventional structure was evaluated on Total harmonic distortion and power dissipation. A proposed fifth-order Butterworth OTA-C low-pass filter for ECG applications achieved a total harmonic distortion of 49.8 dBc under a 50 Hz bandwidth with 350 nW total power dissipation.
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