Abstract
This paper proposed a design and performance analysis of current mirror operational transconductance amplifier (OTA) in 45 nm and 90 nm complementary metal oxide semiconductor (CMOS) technology for bio-medical application. Both OTAs were designed and simulated using Synopsys tools and the simulation results were analysed thoroughly. The OTAs were designed to be implemented in bio-potential signals detection system where the input signals were amplified and filtered according to the specifications. From the comparative analysis of both OTAs, the 45 nm OTA managed to produce open loop gain of 45 dB, with common mode rejection ratio (CMRR) of 93.2 dB. The 45 nm OTA produced only 1.113 μV√Hz of input referred noise at 1 Hz. The 45 nm OTA also consumed only 28.21 nW of power from ± 0.5 V supply. The low-power consumption aspect displayed by 45 nm OTA made it suitable to be implemented in bio-medical application such as bio-potential signals detection system where it can be used to amplify and filter the electrocardiogram (ECG) signals.
Highlights
In analog electronic circuit design, operational amplifier is one of the most important building blocks for its versatility [1,2,3]
The analysis of simulation results were done within Simulation Analysis Environment (SAE) and Waveview tools embedded in the Synopsys softwa re
The stated design specifications are for bio -potential signals detection purpose and based on the discussion, the 45 nm operational transconductance amplifier (OTA) managed to produce 45 dB of open loop gain, 93.2 dB of common mode rejection ratio (CMRR) and only consumed 28.21 nW from ±0
Summary
In analog electronic circuit design, operational amplifier is one of the most important building blocks for its versatility [1,2,3]. Operational amplifier or Op-Amp is basically implemented in circuit designs to realize functions from DC bias generation to voltage or current amplification and signal filtering [4]. While Op-Amp is mostly popular in telecommunication application, its usage in bio -medical application is prominent as it is implemented in bio -amplifier system to amplify small bio-potential signals from human body to be analyzed by medical pract itioner [4, 6,7,8,9,10,11]. All bio-potential signals have same characteristics; small amplitude, small frequency range and contain external noise. The current trend in bio-medical application is by using portable battery as Journal homepage: http://beei.org
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