Frequency compensation in an input folded-cascode output buffered opamp with high PSRR
Low power low voltage systems are important aspect in every portable device. Powering up a device using a low voltage supply limits the maximum and minimum input voltage. To fully utilise a device with low voltage, the input voltage should be allowed to be as close as possible to the supply voltage....
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Format: | Final Year Project (FYP) |
Language: | English |
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2019
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Online Access: | http://hdl.handle.net/10356/78162 |
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author | Angtoni, Erik |
author2 | Siek Liter |
author_facet | Siek Liter Angtoni, Erik |
author_sort | Angtoni, Erik |
collection | NTU |
description | Low power low voltage systems are important aspect in every portable device. Powering up a device using a low voltage supply limits the maximum and minimum input voltage. To fully utilise a device with low voltage, the input voltage should be allowed to be as close as possible to the supply voltage. This project presents op-amp design that enable rail-to-rail input and output stage. PMOS and NMOS differential pair are utilised as the input stage to achieve a rail-to-rail input stage. However, there exists a region where both transistors are on and causes gm to be nonconstant. Overlapping transition region technique is implemented to achieve a constant gm at the input stage. The designed circuit allows rail-to-rail input and output voltage with input stage gm variation of 5%-6%. Open-loop gain of 89.67dB and phase margin of 61.24° are achieved. Total Harmonic Distortion at fundamental frequency of 1kHz allows input voltage of 0.83Vpp at 0.01% or -80dB. CSM 0.18μm process technology is used in Cadence Custom IC Design Tools (Virtuoso Front to Back Design Environment) to complete this project. |
first_indexed | 2024-10-01T03:41:44Z |
format | Final Year Project (FYP) |
id | ntu-10356/78162 |
institution | Nanyang Technological University |
language | English |
last_indexed | 2024-10-01T03:41:44Z |
publishDate | 2019 |
record_format | dspace |
spelling | ntu-10356/781622023-07-07T15:56:48Z Frequency compensation in an input folded-cascode output buffered opamp with high PSRR Angtoni, Erik Siek Liter School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering Low power low voltage systems are important aspect in every portable device. Powering up a device using a low voltage supply limits the maximum and minimum input voltage. To fully utilise a device with low voltage, the input voltage should be allowed to be as close as possible to the supply voltage. This project presents op-amp design that enable rail-to-rail input and output stage. PMOS and NMOS differential pair are utilised as the input stage to achieve a rail-to-rail input stage. However, there exists a region where both transistors are on and causes gm to be nonconstant. Overlapping transition region technique is implemented to achieve a constant gm at the input stage. The designed circuit allows rail-to-rail input and output voltage with input stage gm variation of 5%-6%. Open-loop gain of 89.67dB and phase margin of 61.24° are achieved. Total Harmonic Distortion at fundamental frequency of 1kHz allows input voltage of 0.83Vpp at 0.01% or -80dB. CSM 0.18μm process technology is used in Cadence Custom IC Design Tools (Virtuoso Front to Back Design Environment) to complete this project. Bachelor of Engineering (Electrical and Electronic Engineering) 2019-06-13T01:33:37Z 2019-06-13T01:33:37Z 2019 Final Year Project (FYP) http://hdl.handle.net/10356/78162 en Nanyang Technological University 76 p. application/pdf |
spellingShingle | DRNTU::Engineering::Electrical and electronic engineering Angtoni, Erik Frequency compensation in an input folded-cascode output buffered opamp with high PSRR |
title | Frequency compensation in an input folded-cascode output buffered opamp with high PSRR |
title_full | Frequency compensation in an input folded-cascode output buffered opamp with high PSRR |
title_fullStr | Frequency compensation in an input folded-cascode output buffered opamp with high PSRR |
title_full_unstemmed | Frequency compensation in an input folded-cascode output buffered opamp with high PSRR |
title_short | Frequency compensation in an input folded-cascode output buffered opamp with high PSRR |
title_sort | frequency compensation in an input folded cascode output buffered opamp with high psrr |
topic | DRNTU::Engineering::Electrical and electronic engineering |
url | http://hdl.handle.net/10356/78162 |
work_keys_str_mv | AT angtonierik frequencycompensationinaninputfoldedcascodeoutputbufferedopampwithhighpsrr |