- Book chapter

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

Chapter title | Accurate stability prediction of single-bit higher-order delta-sigma (Δ-Σ) modulators for speech codecs |
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Authors | Lota, J. and Al-Janabi, M. |

Abstract | Present approaches for predicting the stability of Delta-Sigma (Δ-Σ) modulators are mostly confined to DC inputs. This poses limitations as practical applications of Δ-Σ modulators involve a wide range of signals other than DC such as speech, audio and multiple sinusoids as is the case for synthetically generated speech or audio or any other signal, through the appropriate composition of multiple sinusoids. In this paper, a quasi-linear model that accurately predicts stability of single-loop 1-bit higher-order Δ-Σ modulators for multiple sinusoids is given. The results of this paper would enable optimization of the design of higher-order single-loop Δ-Σ modulators with increased dynamic ranges for various applications that deploy multiple sinusoidal inputs, as well as any general input signal constructed from multiple sinusoids. |

Book title | Proceedings of the 2011 IEEE International Symposium on Circuits and Systems (ISCAS), Rio de Janeiro, Brazil, 15-18 May 2011 |

Page range | 1628-1631 |

Year | 2011 |

Publisher | IEEE |

Publication dates | |

Published | 2011 |

ISBN | 9781424494736 |

Digital Object Identifier (DOI) | doi:10.1109/ISCAS.2011.5937891 |

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

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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

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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. doi:10.1109/TIM.2007.911640

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

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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. doi:10.1016/S0920-5489(01)00062-9

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. doi:10.1109/19.799638

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. doi:10.1049/el:19971370

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

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