The design of an operational transconductance amplifier (OTA)

Operational amplifiers are commonly used in analog circuit designing, especially operational transconductance amplifier (OTA)which is used to convert input voltage signal into an output current. However, OTA could only drive capacitive load, therefore an extra output stage is needed. The OTA is desi...

Full description

Saved in:
Bibliographic Details
Main Author: Yap, Deep
Other Authors: Siek Liter
Format: Final Year Project
Language:English
Published: 2017
Subjects:
Online Access:http://hdl.handle.net/10356/70770
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
Description
Summary:Operational amplifiers are commonly used in analog circuit designing, especially operational transconductance amplifier (OTA)which is used to convert input voltage signal into an output current. However, OTA could only drive capacitive load, therefore an extra output stage is needed. The OTA is designed using the nested- current mirror technique, which is able to deliver a DC gain of 70dB, phase margin more than 60 degrees and with slew rate of 8mV/μs for a capacitive load of 0.5nF. The output stage is designed in a class AB configuration, which would able to sink and source 1mA current to a 1kΩ resistive load while maintaining output swing with one overdrive voltage less than the supply voltage. The CMOS technology used is 0.18μm.