A Gate-Leakage Insensitive 0.7-V 233-nW ECG Amplifier using Non-Feedback PMOS Pseudo-Resistors in 0.13-mu m N-well CMOS
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- Title
- A Gate-Leakage Insensitive 0.7-V 233-nW ECG Amplifier using Non-Feedback PMOS Pseudo-Resistors in 0.13-mu m N-well CMOS
- Authors
- Um, JY; Sim, JY; Park, HJ
- Date Issued
- 2010-12
- Publisher
- IEEK PUBLICATION CENTER
- Abstract
- A fully-differential low-voltage low-power electrocardiogram (ECG) amplifier by using the non-feedback 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.
- Keywords
- Electrocardiogram amplifier; pseudo-resistor; gate leakage; low-voltage OTA; FRONT-END
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17529
- DOI
- 10.5573/JSTS.2010.10.4.309
- ISSN
- 1598-1657
- Article Type
- Article
- Citation
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, vol. 10, no. 4, page. 309 - 315, 2010-12
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