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Fahad Qazi - IEEE Xplore Author Profile

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Author details

Fahad Qazi

Publications

8

Citations

76

Publications by Year

20102016

Co-Authors:

Atila AlvandpourJerzy J. DabrowskiQuoc-Tai DuongAli Fazli Yeknami

Fahad Qazi

Affiliation

Catena Wireless Electronics AB, Kista, Sweden

Publication Topics

Clock Frequency,
Flicker Noise,
Lack Of Gain,
Loop Filter,
Noise Figure,
Noise Power,
Nonlinear Model,
Parasitic Capacitance,
Passive Filter,
Phase Noise,
Power Consumption,
Quantization Noise

Biography

Fahad Qazi (S’09–M’15) received the M.S. and Ph.D. degrees in electronics (system on chip) from Linköping University, Linköping, Sweden, in 2009 and 2015, respectively.,Currently, he is with Catena Wireless Electronics AB, Stockholm, Sweden, employed as IC designer. His research interests include the design of multi-standard flexible RF front-ends and $\Delta \Sigma$ modulators for A/D converters.(Based on document published on 28 December 2015).

Publications

8

Citations

76

Publications by Year

20102016

Co-Authors:

Atila Alvandpour
Jerzy J. Dabrowski
Quoc-Tai Duong
Ali Fazli Yeknami

Author's Published Works

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Showing 1-8 of 8 results

Conferences (6)

Journals (2)

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Fahad Qazi(8)
Jerzy J. Dąbrowski(3)
Quoc-Tai Duong(2)
Jerzy Dąbrowski(2)
Atila Alvandpour(2)
Department of Electrical Engineering, Linköping University, Linköping, Sweden(3)
Division of Electronic Devices, Linköping University, Linköping, Sweden(1)
Electronic Devices, Department of Electrical Engineering, Linköping University, Linkoping, Sweden(1)
Department of Electrical Engineering, Linköping University, Sweden(1)
Catena Wireless Electronics AB, Kista, Sweden(1)
ICSES 2010 International Conference on Signals and Electronic Circuits(2)
2011 International Symposium on Integrated Circuits(1)
2013 European Conference on Circuit Theory and Design (ECCTD)(1)
2015 European Conference on Circuit Theory and Design (ECCTD)(1)
2016 International Conference on Signals and Electronic Systems (ICSES)(1)
IEEE(8)
Gliwice, Poland(2)
Dresden, Germany(1)
Krakow, Poland(1)
Singapore(1)
Trondheim, Norway(1)
Clock Frequency(5)
Noise Figure(5)
Parasitic Capacitance(4)
Loop Filter(3)
Power Consumption(3)

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Spectrum sensing for cognitive radio based on flexible RF filtering

Jerzy Dąbrowski;Fahad Qazi

2016 International Conference on Signals and Electronic Systems (ICSES)

Year: 2016 | Conference Paper |

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In this paper we investigate a spectrum sensing technique suitable for cognitive radio (CR) considered a means to mitigate congestion in the future multiple access communication systems. The ultimate objective is opportunistic use of unoccupied frequency bands called spectrum holes or white spaces, which belong to another system. For this purpose, first, we identify the spectrum sensor (SS) nonlin...Show More

Spectrum sensing for cognitive radio based on flexible RF filtering

Jerzy Dąbrowski;Fahad Qazi

2016 International Conference on Signals and Electronic Systems (ICSES)

Year: 2016 | Conference Paper |

Passive SC Sigma Delta Modulators Revisited: Analysis and Design Study

Fahad Qazi;Jerzy J. Dąbrowski

IEEE Journal on Emerging and Selected Topics in Circuits and Systems

Year: 2015 | Volume: 5, Issue: 4 | Journal Article |

Cited by: Papers (11)

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In this paper we study passive switched-capacitor sigma-delta (ΣΔ) modulators suitable for low power applications. Using a one-bit quantizer as the only active block those modulators save power and achieve high linearity. However, their order is largely limited since the passive loop filter presents a significant attenuation to the signal. Typically with a second-order filter the modulator can ach...Show More

Passive SC Sigma Delta Modulators Revisited: Analysis and Design Study

Fahad Qazi;Jerzy J. Dąbrowski

IEEE Journal on Emerging and Selected Topics in Circuits and Systems

Year: 2015 | Volume: 5, Issue: 4 | Journal Article |

Clock phase imbalance and phase noise in RF N-path filters

Fahad Qazi;Jerzy Dąbrowski

2015 European Conference on Circuit Theory and Design (ECCTD)

Year: 2015 | Conference Paper |

Cited by: Papers (7)

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The quality of RF N-path filtering is limited by the performance of the involved multiphase clock. The paper presents analysis of critical clock imperfections. The phase imbalance that gives rise to an extra image band located at second harmonic frequency is analyzed by a linear periodically varying (LPV) model of a 4-path filter where the respective rejection ratio is estimated and verified by si...Show More

Clock phase imbalance and phase noise in RF N-path filters

Fahad Qazi;Jerzy Dąbrowski

2015 European Conference on Circuit Theory and Design (ECCTD)

Year: 2015 | Conference Paper |

Low-Power DT $\Delta \Sigma$ Modulators Using SC Passive Filters in 65 nm CMOS

Ali Fazli Yeknami;Fahad Qazi;Atila Alvandpour

IEEE Transactions on Circuits and Systems I: Regular Papers

Year: 2014 | Volume: 61, Issue: 2 | Journal Article |

Cited by: Papers (50)

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A comparative design study of ultra-low-power discrete-time ΔΣ modulators (DT ΔΣMs) suited for medical implant devices is presented. Aiming to reduce the analog power consumption, the objective is to investigate the effectiveness of the switched-capacitor passive filter. Two design variants of 2nd-order ΔΣMs are analyzed and compared to a power-optimized standard active modulator (ΔΣMAA). The firs...Show More

Low-Power DT $\Delta \Sigma$ Modulators Using SC Passive Filters in 65 nm CMOS

Ali Fazli Yeknami;Fahad Qazi;Atila Alvandpour

IEEE Transactions on Circuits and Systems I: Regular Papers

Year: 2014 | Volume: 61, Issue: 2 | Journal Article |

Blocker and image reject low-IF frontend

Fahad Qazi;Quoc-Tai Duong;Jerzy J. Dąbrowski

2013 European Conference on Circuit Theory and Design (ECCTD)

Year: 2013 | Conference Paper |

Cited by: Papers (3)

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In this paper we present a design of a low-IF receiver frontend using a selective N-path filter which serves blocker rejection, image rejection, and downconversion. The filter makes use of quadrature impedance upconversion technique using multiphase clocking and can be programmed by baseband capacitance and gm-cell transconductance values to meet the low-IF criterion in various cases. Presented is...Show More

Blocker and image reject low-IF frontend

Fahad Qazi;Quoc-Tai Duong;Jerzy J. Dąbrowski

2013 European Conference on Circuit Theory and Design (ECCTD)

Year: 2013 | Conference Paper |

Wideband RF frontend design for flexible radio receiver

Fahad Qazi;Quoc-Tai Duong;Jerzy J. Dąbrowski

2011 International Symposium on Integrated Circuits

Year: 2011 | Conference Paper |

Cited by: Patents (1)

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A wideband RF frontend for flexible radio applications is presented. A target is the performance adequate for multistandard 3G/ 4G systems operating in frequency range 0.8-6 GHz. Because of relaxed requirements on band select filters, more demands are placed on linearity while the necessary noise performance is assured. We discuss architecture with Low Noise Transconductance Amplifier (LNTA) and a...Show More

Wideband RF frontend design for flexible radio receiver

Fahad Qazi;Quoc-Tai Duong;Jerzy J. Dąbrowski

2011 International Symposium on Integrated Circuits

Year: 2011 | Conference Paper |

IP2 calibration of ADC for SDR receiver

Fahad Qazi;Jerzy Dabrowski

ICSES 2010 International Conference on Signals and Electronic Circuits

Year: 2010 | Conference Paper |

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In this paper we discuss a possible variant of A/D conversion in pure software-defined radio (SDR) receiver architecture. The requirements for the ADC dynamic range and linearity are formulated for the contemporary personal and data-communication RF standards. A technique for IP2 calibration of a ΣΔ ADC designed in 65 nm CMOS is introduced. The ADC is a lowpass second order ΣΔ modulator with one b...Show More

IP2 calibration of ADC for SDR receiver

Fahad Qazi;Jerzy Dabrowski

ICSES 2010 International Conference on Signals and Electronic Circuits

Year: 2010 | Conference Paper |

Design of OTAs for ultra-low-power sigma-delta ADCs in medical applications

Ali Fazli Yeknami;Fahad Qazi;Jerzy J. Dabrowski;Atila Alvandpour

ICSES 2010 International Conference on Signals and Electronic Circuits

Year: 2010 | Conference Paper |

Cited by: Papers (5)

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High-resolution sigma-delta ADCs are gaining significant interest in ultra-low-power medical applications, where accurate measurement of low-frequency and weak electrophysiological signals is required. Operational transconductance amplifiers (OTA) are the key analog component and the most power-hungry part of the sigma-delta (ΣA) modulators. This paper presents a study of OTAs for ultra-low-power ...Show More

Design of OTAs for ultra-low-power sigma-delta ADCs in medical applications

Ali Fazli Yeknami;Fahad Qazi;Jerzy J. Dabrowski;Atila Alvandpour

ICSES 2010 International Conference on Signals and Electronic Circuits

Year: 2010 | Conference Paper |

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