Fig. 1.
Analog frond-end circuit of ECG bio-telemetry monitoring system.
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| Citation: |
Jihai Duan, Chuang Lan, Weilin Xu, Baolin Wei. An OTA-C filter for ECG acquisition systems with highly linear range and less passband attenuation[J]. Journal of Semiconductors, 2015, 36(5): 055006. doi: 10.1088/1674-4926/36/5/055006
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J H Duan, C Lan, W L Xu, B L Wei. An OTA-C filter for ECG acquisition systems with highly linear range and less passband attenuation[J]. J. Semicond., 2015, 36(5): 055006. doi: 10.1088/1674-4926/36/5/055006.
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An OTA-C filter for ECG acquisition systems with highly linear range and less passband attenuation
DOI: 10.1088/1674-4926/36/5/055006
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Abstract
A fifth order operational transconductance amplifier-C (OTA-C) Butterworth type low-pass filter with highly linear range and less passband attenuation is presented for wearable bio-telemetry monitoring applications in a UWB wireless body area network. The source degeneration structure applied in typical small transconductance circuit is improved to provide a highly linear range for the OTA-C filter. Moreover, to reduce the passband attenuation of the filter, a cascode structure is employed as the output stage of the OTA. The OTA-based circuit is operated in weak inversion due to strict power limitation in the biomedical chip. The filter is fabricated in a SMIC 0.18-μ m CMOS process. The measured results for the filter have shown a passband gain of -6.2 dB, while the -3-dB frequency is around 276 Hz. For the 0.8 VPP sinusoidal input at 100 Hz, a total harmonic distortion (THD) of -56.8 dB is obtained. An electrocardiogram signal with noise interference is fed into this chip to validate the function of the designed filter. -
References
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