Analogue circuits for low power communication
Low power electronic circuits are required to extend the operational time of battery operated devices. They are also necessary to reduce the power consumption of equipment in general, especially as the world tries to cut energy usage. The first section of this thesis explores fundamental and impleme...
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ndltd-bl.uk-oai-ethos.bl.uk-5145562017-08-30T03:16:38ZAnalogue circuits for low power communicationTuckwell, Mark DavidPapavassiliou, Christos2010Low power electronic circuits are required to extend the operational time of battery operated devices. They are also necessary to reduce the power consumption of equipment in general, especially as the world tries to cut energy usage. The first section of this thesis explores fundamental and implementation limits for low power circuits. The energy requirements of amplification are presented and a lower bound on the energy required to transmit information over a point to point link is proposed. It is evident from the low power limits survey that when a transistor is biased, significant thermodynamic energy is required to reduce the resistance of the channel. A transmitter is presented that turns on a transistor for 0.1 % of transmitted time. This transmitter approximates a Gaussian pulse by allowing the impulse response of two 2nd order transmitting elements to sum in free space. The transmitter is of low complexity and the receiver architecture ensures that no on-line tuning is required. Measured results indicate that by using coherent detection a 1 Mbps, 50 mm distance link with a bit error rate of 10−3 can be achieved. The bandwidth of the transmitted pulse is 30-37.5 MHz and 30 dB of out of band attenuation is provided. An analogue Gabor transform is described which splits a signal into parallel paths of a lower bandwidth. This enables post processing at lower clock rates, which can reduce energy dissipation. An implementation of the transform using sub-threshold CMOS continuous time filters is presented. A novel method for designing low power gmC filters using simple models of identical transconductors is used to specify transistor sizes. Measured results show that the transform consumes 7 μW for an input signal bandwidth of 4 kHz.621.3Imperial College Londonhttp://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514556http://hdl.handle.net/10044/1/5594Electronic Thesis or Dissertation |
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621.3 Tuckwell, Mark David Analogue circuits for low power communication |
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Low power electronic circuits are required to extend the operational time of battery operated devices. They are also necessary to reduce the power consumption of equipment in general, especially as the world tries to cut energy usage. The first section of this thesis explores fundamental and implementation limits for low power circuits. The energy requirements of amplification are presented and a lower bound on the energy required to transmit information over a point to point link is proposed. It is evident from the low power limits survey that when a transistor is biased, significant thermodynamic energy is required to reduce the resistance of the channel. A transmitter is presented that turns on a transistor for 0.1 % of transmitted time. This transmitter approximates a Gaussian pulse by allowing the impulse response of two 2nd order transmitting elements to sum in free space. The transmitter is of low complexity and the receiver architecture ensures that no on-line tuning is required. Measured results indicate that by using coherent detection a 1 Mbps, 50 mm distance link with a bit error rate of 10−3 can be achieved. The bandwidth of the transmitted pulse is 30-37.5 MHz and 30 dB of out of band attenuation is provided. An analogue Gabor transform is described which splits a signal into parallel paths of a lower bandwidth. This enables post processing at lower clock rates, which can reduce energy dissipation. An implementation of the transform using sub-threshold CMOS continuous time filters is presented. A novel method for designing low power gmC filters using simple models of identical transconductors is used to specify transistor sizes. Measured results show that the transform consumes 7 μW for an input signal bandwidth of 4 kHz. |
author2 |
Papavassiliou, Christos |
author_facet |
Papavassiliou, Christos Tuckwell, Mark David |
author |
Tuckwell, Mark David |
author_sort |
Tuckwell, Mark David |
title |
Analogue circuits for low power communication |
title_short |
Analogue circuits for low power communication |
title_full |
Analogue circuits for low power communication |
title_fullStr |
Analogue circuits for low power communication |
title_full_unstemmed |
Analogue circuits for low power communication |
title_sort |
analogue circuits for low power communication |
publisher |
Imperial College London |
publishDate |
2010 |
url |
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514556 |
work_keys_str_mv |
AT tuckwellmarkdavid analoguecircuitsforlowpowercommunication |
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1718521399905091584 |