By Associate Professor Torsten Lehmann

Book Chapters

Lehmann T; Jung LH; Suaning GJ; Lovell NH, 2022, 'Visual Stimulation Systems', in Handbook of Biochips: Integrated Circuits and Systems for Biology and Medicine, Springer New York, pp. 517 - 539, http://dx.doi.org/10.1007/978-1-4614-3447-4_5

Lehmann T; Aluthwala P; Parameswaran S, 2019, 'Digitally enhanced digital-to-analogue converters', in Digitally Enhanced Mixed Signal Systems, Institution of Engineering and Technology, pp. 227 - 254, http://dx.doi.org/10.1049/pbcs040e_ch6

Lehmann T; van Schaik A, 2018, 'Implantable hearing interfaces', in Living Machines: A Handbook of Research in Biomimetic and Biohybrid Systems, pp. 520 - 525, http://dx.doi.org/10.1093/oso/9780199674923.003.0054

McEwan A; Gargiulo GD; Fornusek C; Lehmann T, 2017, 'Bioelectronics', in Encyclopedia of Computer Science and Technology, CRC Press, pp. 172 - 185, http://dx.doi.org/10.1201/9781315115894-22

Lehmann T; Jung LH; Suaning GJ; Lovell NH, 2015, 'Visual Stimulation Systems', in Handbook of Biochips, Springer New York, pp. 1 - 23, http://dx.doi.org/10.1007/978-1-4614-6623-9_5-1

Lovell NH; Hallum LE; Chen SC; Dokos S; Preston P; Green RA; Poole-Warren LA, 2007, 'Advances in Retinal Neuroprosthetics', in Metin Akay (ed.), Handbook of Neural Engineering, IEEE Press, Piscataway, New Jersey, USA, pp. 337 - 356, http://dx.doi.org/10.1002/9780470068298.ch20

Journal articles

Wei Y; Wang H; Al Abed A; Almasri RM; Lei X; Firth J; Silvestri L; Ladouceur F; Lehmann T; Lovell NH, 2023, 'A Bi-Directional Detection and Stimulation Optrode System With Charge Balancing for Neural Applications', Journal of Lightwave Technology, 41, pp. 4463 - 4472, http://dx.doi.org/10.1109/JLT.2023.3250827

Al Abed A; Wei Y; Almasri RM; Lei X; Wang H; Firth J; Chen Y; Gouailhardou N; Silvestri L; Lehmann T; Ladouceur F; Lovell NH, 2022, 'Liquid crystal electro-optical transducers for electrophysiology sensing applications', Journal of Neural Engineering, 19, http://dx.doi.org/10.1088/1741-2552/ac8ed6

Almasri RM; Abed AA; Wei Y; Wang H; Firth J; Poole-Warren LA; Ladouceur F; Lehmann T; Lovell NH, 2022, 'Impedance Properties of Multi-Optrode Biopotential Sensing Arrays', IEEE Transactions on Biomedical Engineering, 69, pp. 1674 - 1684, http://dx.doi.org/10.1109/TBME.2021.3126849

Wei Y; Lehmann T; Silvestri L; Wang H; Ladouceur F, 2021, 'Photodiode working in zero-mode: Detecting light power change with DC rejection and AC amplification', Optics Express, 29, pp. 18915 - 18931, http://dx.doi.org/10.1364/OE.426503

Irfansyah AN; Lehmann T; Jenkins J; Tong T; Hamilton TJ, 2019, 'A resistive DAC for a multi-stage sigma-delta modulator DAC with dynamic element matching', Analog Integrated Circuits and Signal Processing, 98, pp. 109 - 123, http://dx.doi.org/10.1007/s10470-018-1240-3

George L; Lehmann T; Hamilton TJ, 2018, 'A reconfigurable dual-output buck-boost switched-capacitor converter using adaptive gain and discrete frequency scaling control', Microelectronics Journal, 73, pp. 59 - 74, http://dx.doi.org/10.1016/j.mejo.2018.01.004

Cook AJ; Ng B; Gargiulo GD; Hindmarsh D; Pitney M; Lehmann T; Hamilton TJ, 2018, 'Instantaneous VO2 from a wearable device', Medical Engineering and Physics, 52, pp. 41 - 48, http://dx.doi.org/10.1016/j.medengphy.2017.12.008

Rahman MT; Lehmann T, 2017, 'A Self-Calibrated Cryogenic Current Cell for 4.2 K Current Steering D/A Converters', IEEE Transactions on Circuits and Systems II: Express Briefs, 64, pp. 1152 - 1156, http://dx.doi.org/10.1109/TCSII.2016.2631489

Nicholson AP; Irfansyah AN; Jenkins J; Hamilton TJ; Lehmann T, 2017, 'A statistical design approach using fixed and variable width transconductors for positive-feedback gain-enhancement OTAs', IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 25, pp. 1966 - 1977, http://dx.doi.org/10.1109/TVLSI.2017.2657885

Aluthwala PD; Weste N; Adams A; Lehmann T; Parameswaran S, 2017, 'Partial dynamic element matching technique for digital-to-analog converters used for digital harmonic-cancelling sine-wave synthesis', IEEE Transactions on Circuits and Systems I: Regular Papers, 64, pp. 296 - 309, http://dx.doi.org/10.1109/TCSI.2016.2613938

Irfansyah AN; Nicholson AP; Iberzanov A; Jenkins J; Lehmann T; Hamilton TJ, 2016, 'Automatic tuning of digitally-controllable positive-feedback OTAs in continuous-time sigma–delta modulators', Analog Integrated Circuits and Signal Processing, 89, pp. 469 - 483, http://dx.doi.org/10.1007/s10470-016-0820-3

Nicholson AP; Iberzanov A; Jenkins J; Hamilton TJ; Lehmann T, 2016, 'A Statistical Design Approach for a Digitally Programmable Mismatch-Tolerant High-Speed Nauta Structure Differential OTA in 65-nm CMOS', IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 24, pp. 2899 - 2910, http://dx.doi.org/10.1109/TVLSI.2016.2526048

George L; Gargiulo GD; Lehmann T; Hamilton TJ, 2016, 'A 0.04 mm² Buck-Boost DC-DC Converter for Biomedical Implants Using Adaptive Gain and Discrete Frequency Scaling Control', IEEE Transactions on Biomedical Circuits and Systems, 10, pp. 668 - 678, http://dx.doi.org/10.1109/TBCAS.2015.2480035

Rahman MT; Lehmann T, 2016, 'A cryogenic DAC operating down to 4.2 K', Cryogenics, 75, pp. 47 - 55, http://dx.doi.org/10.1016/j.cryogenics.2016.02.003

George L; Gargiulo GD; Lehmann T; Hamilton TJ, 2015, 'Concept design for a 1-lead wearable/implantable ECG front-end: Power management', Sensors (Switzerland), 15, pp. 29297 - 29315, http://dx.doi.org/10.3390/s151129297

Cook AJ; Gargiulo GD; Lehmann T; Hamilton TJ, 2015, 'Open platform, eight-channel, portable bio-potential and activity data logger for wearable medical device development', Electronics Letters, 51, pp. 1641 - 1643, http://dx.doi.org/10.1049/el.2015.2764

Das K; Lehmann T; Dzurak AS, 2014, 'Sub-nanoampere one-shot single electron transistor readout electrometry below 10 kelvin', IEEE Transactions on Circuits and Systems I: Regular Papers, 61, pp. 2816 - 2824, http://dx.doi.org/10.1109/TCSI.2014.2321196

Das K; Lehmann T, 2014, 'Simple front-end interfacing circuit for lowvoltage microelectronics', Electronics Letters, 50, pp. 349 - 351, http://dx.doi.org/10.1049/el.2013.3523

Lehmann T, 2014, 'Design of fast low-power floating high-voltage level-shifters', Electronics Letters, 50, pp. 202 - 204, http://dx.doi.org/10.1049/el.2013.2270

Das K; Lehmann T, 2014, 'Effect of deep cryogenic temperature on silicon-on-insulator CMOS mismatch: A circuit designer's perspective', Cryogenics, 62, pp. 84 - 93, http://dx.doi.org/10.1016/j.cryogenics.2014.04.014

Chun H; Yang Y; Lehmann T, 2014, 'Safety ensuring retinal prosthesis with precise charge balance and low power consumption', IEEE Transactions on Biomedical Circuits and Systems, 8, pp. 108 - 118, http://dx.doi.org/10.1109/TBCAS.2013.2257171

Afshar S; Cohen GK; Wang RM; Van Schaik A; Tapson J; Lehmann T; Hamilton TJ, 2013, 'The ripple pond: Enabling spiking networks to see', Frontiers in Neuroscience, http://dx.doi.org/10.3389/fnins.2013.00212

Jung LH; Shany N; Emperle A; Lehmann T; Byrnes-Preston P; Lovell NH; Suaning GJ, 2013, 'Design of safe two-wire interface-driven chip-scale neurostimulator for visual prosthesis', IEEE Journal of Solid-State Circuits, 48, pp. 2217 - 2229, http://dx.doi.org/10.1109/JSSC.2013.2264136

Yang Y; Chun H; Lehmann T, 2013, 'Dual-stacked current recycling linear regulators with 48% power saving for biomedical implants', IEEE Transactions on Circuits and Systems I: Regular Papers, 60, pp. 1946 - 1958, http://dx.doi.org/10.1109/TCSI.2012.2226489

Lehmann T; Chun H; Yang Y, 2012, 'Power Saving Circuit Design Techniques For Implantable Neuro-Stimulators', Journal of Circuits Systems and Computers, 21, pp. 1240016-2 - 1240016-14, http://dx.doi.org/10.1142/S0218126612400166

Moghe Y; Lehmann T; Piessens T, 2011, 'Nanosecond Delay Floating High Voltage Level Shifters in a 0.35um HV-CMOS Technology', IEEE Journal of Solid - State Circuits, 46, pp. 485 - 497, http://dx.doi.org/10.1109/JSSC.2010.2091322

Ekanayake SR; Lehmann T; Dzurak A; Clark RG; Brawley , 2010, 'Characterization of SOS-CMOS FETs at Low Temperatures for the Design of Integrated Circuits for Quantum Bit Control and Readout', IEEE Transactions on Electron Devices, 57, pp. 539 - 547, http://dx.doi.org/10.1109/TED.2009.2037381

Dommel NB; Wong YT; Lehmann T; Dodds CW; Suaning GJ; Lovell NH, 2009, 'A CMOS retinal neurostimulator capable of focused, simultaneous stimulation', Journal of neural engineering, 6, pp. 1 - 10, http://dx.doi.org/10.1088/1741-2560/6/3/035006

Wong YT; Dommel N; Preston P; Hallum LE; Lehmann T; Lovell NH; Suaning GJ, 2007, 'Retinal neurostimulator for a multifocal vision prosthesis', IEEE Transactions on Neural Systems and Rehabilitation Engineering, 15, pp. 425 - 434, http://dx.doi.org/10.1109/TNSRE.2007.903958

Wong YT; Dommel NB; Preston P; Hallum LE; Lehmann T; Lovell NH; Suaning GJ, 2007, 'Retinal neurostimulator for a multifocal vision prosthesis', IEEE Transactions on Neural Systems and Rehabilitation Engineering, 15, pp. 425 - 434, http://dx.doi.org/10.1109/TNSRE.2007.903958

Lehmann T; Kwok CY; Hasan T, 2005, 'On-chip high voltage charge pump in standard low voltage CMOS process', Electronics Letters, 41, pp. 840 - 842, http://dx.doi.org/10.1049/el:20051488

Conference Papers

Yang E; Lehmann T, 2020, 'On-Chip Digitally Controlled Operational Amplifier Characterisation Circuit without Additional Pins', in Midwest Symposium on Circuits and Systems, pp. 998 - 1002, http://dx.doi.org/10.1109/MWSCAS48704.2020.9184530

Wei Y; Al Abed A; Gouailhardou N; Wang H; Lei X; Ladouceur F; Lehmann T; Lovell NH; Silvestri L, 2019, 'Optically measuring nerve activity based on an electro-optical detection system', in Proceedings of SPIE - The International Society for Optical Engineering. Biophotonics Australasia 2019, Society of Photo-optical Instrumentation Engineers, Melbourne, presented at ANZCOP, Melbourne, 08 December 2019 - 12 December 2019, http://dx.doi.org/10.1117/12.2540053

Lehmann T, 2019, 'Cryogenic support circuits and systems for silicon quantum computers', in Proceedings - IEEE International Symposium on Circuits and Systems, http://dx.doi.org/10.1109/ISCAS.2019.8702413

Silvestri L; Al Abed A; Revol ECM; Firth J; Wei Y; Wang H; Gouailhardou N; Lehmann T; Lovell NH; Ladouceur F, 2019, 'First biopotential recordings from a liquid crystal optrode', in Progress in Biomedical Optics and Imaging - Proceedings of SPIE, http://dx.doi.org/10.1117/12.2544087

Yang E; Lehmann T, 2019, 'High gain operational amplifiers in 22 nm CMOS', in Proceedings - IEEE International Symposium on Circuits and Systems, http://dx.doi.org/10.1109/ISCAS.2019.8702381

Pham L; Irfansyah AN; Hamilton TJ; Lehmann T, 2017, 'The effect of source resistance on the linearity of Nauta structure OTA', in Midwest Symposium on Circuits and Systems, pp. 1208 - 1211, http://dx.doi.org/10.1109/MWSCAS.2017.8053146

Aluthwala P; Weste N; Adams A; Lehmann T; Parameswaran S, 2016, 'The effect of amplitude resolution and mismatch on a digital-to-analog converter used for digital harmonic-cancelling sine-wave synthesis', in Proceedings - IEEE International Symposium on Circuits and Systems, IEEE, Montreal, CANADA, pp. 2018 - 2021, presented at IEEE International Symposium on Circuits and Systems (ISCAS), Montreal, CANADA, 22 May 2016 - 25 May 2016, http://dx.doi.org/10.1109/ISCAS.2016.7538973

Phoon DKH; Lehmann T; Hamilton TJ; Jenkins J, 2016, 'Hybrid dual-mode low voltage dropout regulator with infinite impulse response digital filters', in LASCAS 2016 - 7th IEEE Latin American Symposium on Circuits and Systems, R9 IEEE CASS Flagship Conference, Santa Catarina Florianopolis, SC, Brazil, pp. 195 - 198, presented at 2016 IEEE 7th Latin American Symposium on Circuits & Systems (LASCAS), Santa Catarina Florianopolis, SC, Brazil, 28 February 2016 - 02 March 2016, http://dx.doi.org/10.1109/LASCAS.2016.7451043

Cook AJ; Gargiulo GD; Cook R; Ng B; Hindmarsh D; Lehmann T; Hamilton TJ, 2015, 'A novel method for non-invasive respiration monitoring', in Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS, pp. 4524 - 4527, http://dx.doi.org/10.1109/EMBC.2015.7319400

Irfansyah AN; Nicholson A; Jenkins J; Hamilton TJ; Lehmann T, 2015, 'Subthreshold operation of Nauta's operational transconductance amplifier', in Conference Proceedings - 13th IEEE International NEW Circuits and Systems Conference, NEWCAS 2015, http://dx.doi.org/10.1109/NEWCAS.2015.7182065

Aluthwala PD; Lehmann T; Parameswaran S, 2015, 'Design of a Digital Harmonic-Cancelling Sine-Wave Synthesizer with 100 MHz Output Frequency, 43.5 dB SFDR, and 2.26 mW Power', in Proceedings - IEEE International Symposium on Circuits and Systems, Institute of Electrical and Electronics Engineers, Lisbon, Portugal, pp. 3052 - 3055, presented at International Symposium on Circuits and Systems, Lisbon, Portugal, 24 May 2015 - 27 May 2015, http://dx.doi.org/10.1109/ISCAS.2015.7169331

Iberzanov A; Nicholson A; Jenkins J; Lehmann T; Hamilton TJ, 2015, 'Calibration of the Nauta structure differential OTA', in IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS, pp. 189 - 192, http://dx.doi.org/10.1109/APCCAS.2014.7032753

Alex AZ; Lehmann T, 2015, 'High-voltage tolerant switch configuration using standard 3.3-V 0.5-μm silicon-on-sapphire CMOS transistors', in IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS, pp. 591 - 594, http://dx.doi.org/10.1109/APCCAS.2014.7032850

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