- Open Access
- Authors : M V Sai Meena, Somashekhar Malipatil, D Santhosh Kumar
- Paper ID : IJERTCONV8IS13042
- Volume & Issue : NCCDS – 2020 (Volume 8 – Issue 13)
- Published (First Online): 07-08-2020
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
Low Power CMOS OTA Design for Biomedical Applications
M V Sai Meena
ech Scholar Department of ECE, AVNIET,
Somashekhar Malipatil Assistant Professor Department of ECE, AVNIET,
D Santhosh Kumar Assistant Professor Department of ECE, AVNIET,
Abstract In this paper designing of MOS Transistors in two stages OTA has been done and simulated in 120nm technology. Layout has done using Microwind 2 and schematic is designed using DSCH software. A comparison has been made between scaled voltage supply and power consumption. The simulation results show that the designed two stages OTA achieves the low power consumption
Keywords Operational transconductance amplifier (OTA), CMOS, Power consumption, 120nm Technology, Microwind 2, DSCH 2.
Operational transconductance amplifier is the differential amplifier with single stage. OTA is having two high input impedance nodes. OTA is a device which converts input voltage to output current. Primarily these are called voltage to current amplifiers. It is denoted as gm. The output current is the difference between the inverting and non inverting voltages is shown in the equation 1.
OTA are mainly used in video applications, intermediate frequency, radio frequency. Other additional applications for OTA are sample and hold, timers, multiplexers broadcast equipment and high speed data acquisition devices.
Fig.1 CMOS Differential Amplifier
operational transconductance amplifier
In this paper the two stage transconductance amplifier is designed for lower applications like suitable for biomedical applications by using voltage scaling. In the
first stage the difference amplifier has designed as shown in
fig.1. Fig 2. Differential Amplifier Layout
Fig 3. Differential amplifier 3D process view
Fig 4. CMOS OTA
Fig 5. OTA Layout
Fig 6. OTA 3D process view
In this operational transconductance amplifier supply voltage is reduced to 1.2V.
Fig 7. Ids versus Vds characteristics of OTA
Fig 8. Voltage versus current
In this design low power Operational transconductance amplifier has designed by using voltage scaling down and observed reduction in power consumption as follows when supply voltage 2.5V, 1.8v and 1.2 V applied, the power consumption is 0.512mW, 0.21mW, 0.15mW respectively.
ig 9. Amplifier simulation waveform at Vdd 2.5V
Fig 10. Amplifier simulation waveform at Vdd 1.8V
Fig 11. Amplifier simulation waveform at Vdd 1.2V Table 1: Power analysis
Graph 1. Power analysis
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