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Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology
Dissertation (MEng)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2015
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| _version_ | 1867613678119944192 |
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| access_status_str | Open Access |
| author2 | Sinha, Saurabh |
| author_browse | Sinha, Saurabh |
| author_facet | Sinha, Saurabh |
| collection | Thesis |
| dc_rights_str_mv | © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/48947 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:57.392Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/48947 Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology Sinha, Saurabh Reddy, Reeshen Microelectronic Digital-analogue conversion BiCMOS integrated circuits Dynamic range Analogue-digital integrated circuits Mixed analogue digital integrated circuits UCTD Dissertation (MEng)--University of Pretoria, 2015. High-speed digital to analogue converters (DAC), which are optimised for large bandwidth signal synthesis applications, are a fundamental building block and enabling technology in industrial instrumentation, military, communication and medical applications. The spurious free dynamic range (SFDR) is a key specification of high-speed DACs, as unwanted spurious signals generated by the DAC degrades the performance and effectiveness of wideband systems. The focus of this work is to enhance the SFDR performance of high-speed DACs. As bandwidth requirements increase, meeting the desired SFDR performance is further complicated by the increase in dynamic non-linearity. The most widely used architecture in high-speed applications is the current-steering DAC fabricated on CMOS technology. The current source finite output impedance, switch distortion and clock feedthrough are the greatest contributors to dynamic non-linearity and are difficult to improve with the use of MOS devices alone. This research proposes the use of BiCMOS technology that offers high performance, using heterojunction bipolar transistors (HBT) that, when combined with MOS devices, are able to improve on the linearity of the current-steering DAC and hence improve the SFDR. A design methodology is introduced based on BiCMOS fabrication technology to improve SFDR performance and places emphasis on the constraints of modern fabrication processes. A six-bit current-steering application-specific integrated circuit DAC is designed based on the proposed design methodology, which optimises the SFDR performance of high-speed binary weighted architectures by lowering current switch distortion and reducing the clock feedthrough effect to verify the hypothesis experimentally. A novel current source cell is implemented that comprises HBT current switches, negative channel metal-oxide semiconductor (NMOS) cascode and NMOS current source to overcome distortion by specifically enhancing the SFDR for high-speed DACs. A switch driver and low-voltage differential signalling receiver to achieve high-speed DAC performance and their influence on the SFDR performance are designed and discussed. The DAC is implemented using the International Business Machines Corporation (IBM) 8HP silicon germanium (SiGe) BiCMOS 130 nm technology. The DAC achieves a better than 21.96 dBc SFDR across the Nyquist band for a sampling rate of 500 MS/s with a core size of 0.1 mm2 and dissipates just 4 mW compared to other BiCMOS DACs that achieve similar SFDR performance with higher output voltages, resulting in much larger power dissipation. Electrical, Electronic and Computer Engineering MEng Unrestricted 2015-07-16T06:57:42Z 2015-07-16T06:57:42Z 2015-09-03 2015 Dissertation Reddy, R 2015, Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/48947> S2015 http://hdl.handle.net/2263/48947 en © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Microelectronic Digital-analogue conversion BiCMOS integrated circuits Dynamic range Analogue-digital integrated circuits Mixed analogue digital integrated circuits UCTD Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology |
| title | Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology |
| title_full | Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology |
| title_fullStr | Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology |
| title_full_unstemmed | Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology |
| title_short | Spurious free dynamic range enhancement of high-speed integrated digital to analogue converters using bicmos technology |
| title_sort | spurious free dynamic range enhancement of high speed integrated digital to analogue converters using bicmos technology |
| topic | Microelectronic Digital-analogue conversion BiCMOS integrated circuits Dynamic range Analogue-digital integrated circuits Mixed analogue digital integrated circuits UCTD |
| url | http://hdl.handle.net/2263/48947 |