Senior Lecturer

Department | Computer Science and Engineering |
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Research group | Applied DSP and VLSI |

Design and Implementation of Novel FPGA Based Time-Interleaved Variable Centre-Frequency Digital Sigma-Delta Modulators

Kalafat Kizilkaya, I., Al-Janabi, M. and Kale, I. 2015. Design and Implementation of Novel FPGA Based Time-Interleaved Variable Centre-Frequency Digital Sigma-Delta Modulators. *Special Issue of ACTA IMEKO Journal.* 4 (1), pp. 68-76.

Nonlinear stability prediction of multibit delta--sigma modulators for sinusoidal inputs

Lota, J., Al-Janabi, M. and Kale, I. 2014. Nonlinear stability prediction of multibit delta--sigma modulators for sinusoidal inputs. *IEEE Transactions on Instrumentation and Measurement.* 63 (1), pp. 18-26.

Nonlinear model based approach for accurate stability prediction of one-bit higher-order delta-sigma (Δ-Σ) modulators

Lota, J., Al-Janabi, M. and Kale, I. 2013. Nonlinear model based approach for accurate stability prediction of one-bit higher-order delta-sigma (Δ-Σ) modulators. *IEEE Transactions on Instrumentation and Measurement.* 62 (4), pp. 686-692.

NFC RF Analog Challenge and Enhanced High Speed Transmitter Design

Mwalula, L., Al-Janabi, M. and Kale, I. 2013. NFC RF Analog Challenge and Enhanced High Speed Transmitter Design. *19th IMEKO TC-4 Symposium Measurements of Electrical Quantities.* Barcelona, Spain 18 Jul 2013

Novel Time-Interleaved Variable-Center Frequency Σ-∆ Modulators - Design, Analysis and Critical Evaluation

Kalafat Kizilkaya, I., Al-Janabi, M. and Kale, I. 2013. Novel Time-Interleaved Variable-Center Frequency Σ-∆ Modulators - Design, Analysis and Critical Evaluation. *IEEE Instrumentation and Measurement Technology Conference.* Minneapolis, USA 06 May 2013

Design and Evaluation of Time-Interleaved Variable Center-Frequency Sigma-Delta Modulators

Kalafat Kizilkaya, I., Al-Janabi, M. and Kale, I. 2013. Design and Evaluation of Time-Interleaved Variable Center-Frequency Sigma-Delta Modulators. *18th International Conference on Digital Signal Processing.* Santorini, Greece 01 Jul 2013 IEEE .

Novel time-interleaved variable centre-frequency, single-bit A/D and D/A Sigma-Delta modulator topologies

Kalafat Kızılkaya, I., Al-Janabi, M. and Kale, I. 2013. Novel time-interleaved variable centre-frequency, single-bit A/D and D/A Sigma-Delta modulator topologies. in: 19th IMEKO TC-4, 2013, July 18-19: Symposium Measurements of Electrical Quantities: Barcelona, Spain Barcelona Universitat Politècnica de Catalunya (UPC). pp. 599-604

Accurate stability prediction of one-bit higher-order delta-sigma (Δ-Σ) modulators for multiple-sinusoidal inputs

Lota, J., Al-Janabi, M. and Kale, I. 2012. Accurate stability prediction of one-bit higher-order delta-sigma (Δ-Σ) modulators for multiple-sinusoidal inputs. *IET Circuits, Devices & Systems.* 6 (2), pp. 71-78.

Stability analysis of bandpass sigma–delta modulators for single and dual tone sinusoidal inputs

Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2011. Stability analysis of bandpass sigma–delta modulators for single and dual tone sinusoidal inputs. *IEEE Transactions on Instrumentation and Measurement.* 60 (5), pp. 1546 -1554.

Accurate stability prediction of single-bit higher-order delta-sigma (Δ-Σ) modulators for speech codecs

Lota, J. and Al-Janabi, M. 2011. Accurate stability prediction of single-bit higher-order delta-sigma (Δ-Σ) modulators for speech codecs. in: Proceedings of the 2011 IEEE International Symposium on Circuits and Systems (ISCAS), Rio de Janeiro, Brazil, 15-18 May 2011 IEEE . pp. 1628-1631

Improved ultrasound digital beamforming using single-bit sigma-delta modulators with band-pass decimation filters

Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2011. Improved ultrasound digital beamforming using single-bit sigma-delta modulators with band-pass decimation filters. in: Proceedings of the 2011 IEEE International Symposium on Circuits and Systems (ISCAS), Rio de Janeiro, Brazil, 15-18 May 2011 IEEE . pp. 2091-2094

Improved sigma-delta ultrasound beamformers with adaptive low-pass decimation filters

Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2011. Improved sigma-delta ultrasound beamformers with adaptive low-pass decimation filters. in: Proceedings of the 2011 IEEE Instrumentation and Measurement Technology Conference (I2MTC), Hangzhou, China, 10-12 May 2011 IEEE . pp. 329-333

A describing function based method for predicting the stability of higher-order high-pass sigma-delta modulators

Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2010. A describing function based method for predicting the stability of higher-order high-pass sigma-delta modulators. in: 2010 Conference on Research in Microelectronics and Electronics (PRIME), 18-21 July 2010 IEEE . pp. 1-4

Stability predictions for higher-order band-pass sigma-delta modulators for dual sinusoidal inputs

Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2010. Stability predictions for higher-order band-pass sigma-delta modulators for dual sinusoidal inputs. in: Proceedings of the IEEE Instrumentation and Measurement Technology Conference, Texas, USA, May 3-6 2010 (I3MTC 2010) IEEE . pp. 541-545

A GUI driven Σ-Δ modulator design, evaluation and measurement tool with a view to practical implementation

Altinok, G., Al-Janabi, M., Kale, I. and Altinok, G. 2009. A GUI driven Σ-Δ modulator design, evaluation and measurement tool with a view to practical implementation. in: IEEE Intrumentation and Measurement Technology Conference, Singapore, May 2009. I2MTC '09 IEEE . pp. 1022-1025

Nonlinear-stability analysis of higher order ∆ –Σ modulators for DC and sinusoidal inputs

Lota, J., Al-Janabi, M. and Kale, I. 2008. Nonlinear-stability analysis of higher order ∆ –Σ modulators for DC and sinusoidal inputs. *IEEE Transactions on Instrumentation and Measurement.* 57 (3), pp. 530-542.

System and circuit level design and analysis of a 16-bit sigma-delta ADC for a TETRA-2 network mobile station application

Lota, J., Al-Janabi, M. and Kale, I. 2008. System and circuit level design and analysis of a 16-bit sigma-delta ADC for a TETRA-2 network mobile station application. in: 2008 IEEE Instrumentation and Measurement Technology Conference Proceedings. IMTC 2008 IEEE . pp. 663-667

Tonality index of sigma-delta modulators: a psychoacoustics model based approach

Lota, J., Al-Janabi, M. and Kale, I. 2007. Tonality index of sigma-delta modulators: a psychoacoustics model based approach. in: Proceedings of the IEEE International Symposium on Circuits and Systems 2007, (ISCAS 2007) Los Alamitos, USA IEEE . pp. 729-732

Stability analysis of higher-order delta-sigma modulators for sinusoidal inputs

Lota, J., Al-Janabi, M. and Kale, I. 2007. Stability analysis of higher-order delta-sigma modulators for sinusoidal inputs. in: Proceedings of the IEEE Instrumentation and Measurement Technology Conference, Warsaw, Poland, May 1-3, 2007 Los Alamitos, USA IEEE .

Stability analysis of higher-order delta-sigma modulators using the describing function method

Lota, J., Al-Janabi, M. and Kale, I. 2006. Stability analysis of higher-order delta-sigma modulators using the describing function method. in: Proceedings of the IEEE International Symposium on Circuits and Systems, 2006: ISCAS 2006 Los Alamitos, USA IEEE . pp. 593-596

A study on the effects of accumulated and independent clock jitter on discrete-time delta-sigma modulators

Lota, J., Al-Janabi, M. and Kale, I. 2005. A study on the effects of accumulated and independent clock jitter on discrete-time delta-sigma modulators. in: IEEE Instrumentation and Measurement Technology Conference 2005 IEEE . pp. 786-790

Methods for the transfer function design of multiple narrow-band bandpass sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 2001. Methods for the transfer function design of multiple narrow-band bandpass sigma-delta modulators. *Computer Standards & Interfaces.* 23 (2), pp. 85-102.

Design, analysis and evaluation of bandpass sigma-delta modulators

Al-Janabi, M. 2000. *Design, analysis and evaluation of bandpass sigma-delta modulators.* PhD thesis University of Westminster School of Electronics and Computer Science

Narrow-band variable center frequency single-loop and multistage sigma-delta modulators for bandpass signals

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1999. Narrow-band variable center frequency single-loop and multistage sigma-delta modulators for bandpass signals. *IEEE Transactions on Instrumentation and Measurement.* 48 (5), pp. 873-877.

A comparative study of complex multiple-band noise-shaping sigma-delta modulators for multi-tone input signals

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1999. A comparative study of complex multiple-band noise-shaping sigma-delta modulators for multi-tone input signals. in: Proceedings of the 42nd Midwest Symposium on Circuits and Systems, vol 1, Las Cruces, New Mexico IEEE . pp. 452-455

Increasing the variability of centre frequency locations in multiple-band sigma-delta modulators via the use of fractional delay filters

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1999. Increasing the variability of centre frequency locations in multiple-band sigma-delta modulators via the use of fractional delay filters. in: Proceedings of the Third International Conference on Advanced A/D and D/A Conversion Techniques and their Applications, University of Strathclyde, Glasgow, UK, July 1999 IEEE . pp. 30-33

Concurrent noise-shaping for multiple narrow-band single-loop and multi-stage sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1999. Concurrent noise-shaping for multiple narrow-band single-loop and multi-stage sigma-delta modulators. in: IWADC '99: 4th International Workshop on ADC Modelling and Testing, September 9 - 10, 1999, Laboratoire IXL-ENSERB, Bordeaux, France ; [proceedings] Ecole Nationale Supérieure d'Electricité et de Radioélectricité de Bordeaux. pp. 27-32

Application of fractional delay filters to tune the centre frequency location of single-band sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1999. Application of fractional delay filters to tune the centre frequency location of single-band sigma-delta modulators. in: Proceedings of the 42nd Midwest Symposium on Circuits and Systems, vol 1, Las Cruces, New Mexico IEEE . pp. 181-184

An analysis of non-ideal variable centre frequency narrow-band bandpass sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1998. An analysis of non-ideal variable centre frequency narrow-band bandpass sigma-delta modulators. in: Proceedings of the 1st IEEE International Symposium on Communication Systems and Digital Signal Processing, vol. 1, 6-8 April 1998, Sheffield, UK IEEE . pp. 289-292

Tunable centre frequency resonator based bandpass Σ-Δ modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1998. Tunable centre frequency resonator based bandpass Σ-Δ modulators. in: Proceedings of the Instrumentation and Measurement Technology Conference, vol 2, St. Paul, Minnesota. USA, May 1998 IEEE . pp. 1248-1252

Stability evaluation of tunable resonator-based bandpass sigma-delta modulators via root locus analysis

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1998. Stability evaluation of tunable resonator-based bandpass sigma-delta modulators via root locus analysis. in: Proceedings of the 1st IEEE International Symposium on Communication Systems and Digital Signal Processing, vol. 1, 6-8 April 1998, Sheffield, UK IEEE . pp. 441-444

Variable centre frequency resonator based bandpass Σ-Δ modulator

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1997. Variable centre frequency resonator based bandpass Σ-Δ modulator. *Electronics Letters.* 33 (24), pp. 2008-2009.

Effective-fourth-order resonator based MASH bandpass sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1997. Effective-fourth-order resonator based MASH bandpass sigma-delta modulators. in: Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, vol.3, Munich, Germany, April 1997 IEEE . pp. 2493-2496

Measurement and characterisation of MASH bandpass sigma-delta modulators for direct IF analog-to-digital conversion

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1996. Measurement and characterisation of MASH bandpass sigma-delta modulators for direct IF analog-to-digital conversion. in: Proceedings of the IMEKO International Workshop on ADC Modelling and Virtual Instrumentation, Smolenice Castle, Slovakia. 7-9 May 1996 IMEKO. pp. 147-152

MASH structures for bandpass sigma-delta modulators

Al-Janabi, M., Kale, I. and Morling, R.C.S. 1995. MASH structures for bandpass sigma-delta modulators. in: Proceedings of the IEE Colloquium on Oversampling and Sigma-Delta Strategies for Digital Signal Processing, London, 23 November 1995 IEEE . pp. 3/1-3/6