A Gate-Leakage Insensitive 0.7-V 233-nW ECG Amplifier using Non-Feedback PMOS Pseudo-Resistors in 0.13-μm N-well CMOS
A fully-differential low-voltage low-power electrocardiogram (ECG) amplifier by using the nonfeedback PMOS pseudo-resistors is proposed. It consists of two operational-transconductance amplifiers (OTA) in series (a preamplifier and a variable-gain amplifier). To make it insensitive to the gate leaka...
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Published in | Journal of semiconductor technology and science Vol. 10; no. 4; pp. 309 - 315 |
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Main Authors | , , |
Format | Journal Article |
Language | Korean |
Published |
2010
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Subjects | |
Online Access | Get full text |
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Summary: | A fully-differential low-voltage low-power electrocardiogram (ECG) amplifier by using the nonfeedback PMOS pseudo-resistors is proposed. It consists of two operational-transconductance amplifiers (OTA) in series (a preamplifier and a variable-gain amplifier). To make it insensitive to the gate leakage current of the OTA input transistor, the feedback pseudo-resistor of the conventional ECG amplifier is moved to input branch between the OP amp summing node and the DC reference voltage. Also, an OTA circuit with a Gm boosting block without reducing the output resistance (Ro) is proposed to maximize the OTA DC gain. The measurements shows the frequency bandwidth from 7 Hz to 480 Hz, the midband gain programmable from 48.7 dB to 59.5 dB, the total harmonic distortion (THD) less than 1.21% with a full voltage swing, and the power consumption of 233 nW in a 0.13 ${\mu}m$ CMOS process at the supply voltage of 0.7 V. |
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Bibliography: | KISTI1.1003/JNL.JAKO201008863883997 |
ISSN: | 1598-1657 |