Mohamed Atef - Academia.edu (original) (raw)
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Papers by Mohamed Atef
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC), 2017
2016 Fourth International Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC), 2016
2016 Fourth International Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC), 2016
This paper presents a design and a post layout simulation of a high-sensitivity low-power transim... more This paper presents a design and a post layout simulation of a high-sensitivity low-power transimpedance amplifier (TIA) for frequency domain near infrared spectroscopy (FD-NIRS). The TIA consumes 340 μW from a 1.2 V DC supply. This low power is necessary for NIRS device portability. The proposed TIA achieves 104.8 dBΩ transimpedance gain, 50 MHz bandwidth and 15.1 nArms total integrated input noise current for 2 pF off chip photodiode capacitance. The demonstrated TIA is simulated using 130 nm CMOS technology and occupies an area of 0.0012 mm2. Post amplifier stage is presented to increase the total gain. The complete NIRS optical receiver achieves 119.5 dBΩ gain, 49.2 MHz bandwidth, 15.4 nArms total integrated input noise current and consumes 400 μW from a 1.2 V DC supply.
2015 IEEE International Conference on Electronics, Circuits, and Systems (ICECS), 2015
This paper presents a transimpedance amplifier (TIA) topology employing current-reuse technique t... more This paper presents a transimpedance amplifier (TIA) topology employing current-reuse technique to achieve low power operation. A dual feedback is employed in addition to the current-reuse (CRDF-TIA) to extend the bandwidth while keeping the low power consumption. For large area photodiodes with 2 pF total input capacitance the CRDF-TIA post layout simulation shows a transimpedance gain of 56.75 dBQ and 2 GHz bandwidth. The CRDF-TIA shows a 835nA input-referred noise current and a sensitivity of -22.3 dBm at BER of 10-12. An analytical noise model is derived showing a good accuracy compared to the simulated results. An optical receiver employing the proposed TIA as preamplifier is implemented in 130nm CMOS technology. The TIA is followed by post amplifier and 50 Ω output driver. The complete optical receiver achieves 85.2dBΩ and 1.6 GHz bandwidth. The CRDF-TIA alone consumes 2.85 mW from 1.5 V power supply and the total power consumption of the chip is 29.4 mW.
2015 32nd National Radio Science Conference (NRSC), 2015
Springer Series in Advanced Microelectronics, 2016
2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC), 2017
2016 Fourth International Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC), 2016
2016 Fourth International Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC), 2016
This paper presents a design and a post layout simulation of a high-sensitivity low-power transim... more This paper presents a design and a post layout simulation of a high-sensitivity low-power transimpedance amplifier (TIA) for frequency domain near infrared spectroscopy (FD-NIRS). The TIA consumes 340 μW from a 1.2 V DC supply. This low power is necessary for NIRS device portability. The proposed TIA achieves 104.8 dBΩ transimpedance gain, 50 MHz bandwidth and 15.1 nArms total integrated input noise current for 2 pF off chip photodiode capacitance. The demonstrated TIA is simulated using 130 nm CMOS technology and occupies an area of 0.0012 mm2. Post amplifier stage is presented to increase the total gain. The complete NIRS optical receiver achieves 119.5 dBΩ gain, 49.2 MHz bandwidth, 15.4 nArms total integrated input noise current and consumes 400 μW from a 1.2 V DC supply.
2015 IEEE International Conference on Electronics, Circuits, and Systems (ICECS), 2015
This paper presents a transimpedance amplifier (TIA) topology employing current-reuse technique t... more This paper presents a transimpedance amplifier (TIA) topology employing current-reuse technique to achieve low power operation. A dual feedback is employed in addition to the current-reuse (CRDF-TIA) to extend the bandwidth while keeping the low power consumption. For large area photodiodes with 2 pF total input capacitance the CRDF-TIA post layout simulation shows a transimpedance gain of 56.75 dBQ and 2 GHz bandwidth. The CRDF-TIA shows a 835nA input-referred noise current and a sensitivity of -22.3 dBm at BER of 10-12. An analytical noise model is derived showing a good accuracy compared to the simulated results. An optical receiver employing the proposed TIA as preamplifier is implemented in 130nm CMOS technology. The TIA is followed by post amplifier and 50 Ω output driver. The complete optical receiver achieves 85.2dBΩ and 1.6 GHz bandwidth. The CRDF-TIA alone consumes 2.85 mW from 1.5 V power supply and the total power consumption of the chip is 29.4 mW.
2015 32nd National Radio Science Conference (NRSC), 2015
Springer Series in Advanced Microelectronics, 2016