Abstract
This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.
| Original language | English |
|---|---|
| Article number | 8540907 |
| Pages (from-to) | 56-67 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Biomedical Circuits and Systems |
| Volume | 13 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2019 Feb 1 |
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All Science Journal Classification (ASJC) codes
- Biomedical Engineering
- Electrical and Electronic Engineering
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Low-Voltage OTA-C Filter with an Area- and Power-Efficient OTA for Biosignal Sensor Applications. / Lee, Shuenn-Yuh; Wang, Cheng Pin; Chu, Yuan Sun.
In: IEEE Transactions on Biomedical Circuits and Systems, Vol. 13, No. 1, 8540907, 01.02.2019, p. 56-67.Research output: Contribution to journal › Article
TY - JOUR
T1 - Low-Voltage OTA-C Filter with an Area- and Power-Efficient OTA for Biosignal Sensor Applications
AU - Lee, Shuenn-Yuh
AU - Wang, Cheng Pin
AU - Chu, Yuan Sun
PY - 2019/2/1
Y1 - 2019/2/1
N2 - This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.
AB - This paper presents a systematic method for decreasing the amount of transconductors used by an operational transconductance amplifier-capacitor (OTA-C) filter to decrease the power consumption and the active area. An OTA with a local-feedback linearized technique and a transconductance booster is proposed based on the presented method. The proposed OTA combines current division with source degeneration to enhance linearity and implement low transconductance. This topology enables the proposed OTA to drive multiple integration capacitors without an additional output stage. The OTA-based circuit realizes low power consumption by operating under a weak inversion at a supply voltage of 1 V. Thus, a fifth-order ladder-type low-pass Butterworth OTA-C filter is implemented for the acquisition of electrocardiograph signals. The proposed method is validated using a prototype fabricated through a 1P6M 0.18-μm CMOS process. Results show that in ECG signal acquisition, the proposed filter has a signal bandwidth located within 250 Hz, a dynamic range of 61.2 dB, and a power consumption of 41 nW to achieve a figure-of-merit of 5.4 × 10-13. The active area of the filter is 0.24 mm2.
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U2 - 10.1109/TBCAS.2018.2882521
DO - 10.1109/TBCAS.2018.2882521
M3 - Article
C2 - 30475730
AN - SCOPUS:85057197058
VL - 13
SP - 56
EP - 67
JO - IEEE Transactions on Biomedical Circuits and Systems
JF - IEEE Transactions on Biomedical Circuits and Systems
SN - 1932-4545
IS - 1
M1 - 8540907
ER -