Telecommunication

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Author: search.filters.author.Challal, Mouloud (Supervisor)Has files: Yes

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    Design implementation and Experimental Validation of a Digital PHase Locked Loop ( DPLL)
    (Université M’Hamed bougara : Institute de Ginie électric et électronic, 2023) Cherfi, Abderzak; Challal, Mouloud (Supervisor)
    The present work reports the simulation and realization of a Digital Phase-Locked Loop (DPLL).The circuit consists of three major blocks: a Phase Frequency Detector (PFD), an RC Low-PassFilter (LPF), and a Relaxation Voltage Controlled Oscillator (VCO). The analysis, design, andexamination of each blockwere carried out, resulting in a successful assembly of the entire DPLLcircuit. The designed PLL was simulated,measured, and then compared with the experimentalobservations using LM565 IC. The fi ndings demonstrate the PLL capability to achieve frequencysynchronization with minimal phase error at the desired frequency of 1 KHz, along with a widelock-in range.
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    Investigation of multiband microstrip bandstop filters with and without SMD capacitors
    (2018) Boukhalfa, Ammar; Mekati, Bilal; Challal, Mouloud (Supervisor)
    This work presents the design of multiband bandstop filters (BSFs) based on defected ground structure (DGS) technique. The filters are loaded by surface-mount device (SMD) capacitors for dual and triple stopbands operated at 3.69/7.63 GHz and 3.2/5.56/7.28 GHz, respectively. An additional BSF structure without SMD capacitors operated at 3.77/7.16 GHz is as well designed and fabricated. Due to their satisfactory stopband performances, the proposed filters can be useful for various communication systems with dual and triple bands rejection for WiMAX/C bands.
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    Investigation of multiband microstrip bandstop filters with and without SMD capacitors
    (2018) Boukhalfa, Ammar; Mekati, Bilal; Challal, Mouloud (Supervisor)
    This work presents the design of multiband bandstop filters (BSFs) based on defected ground structure (DGS) technique. The filters are loaded by surface-mount device (SMD) capacitors for dual and triple stopbands operated at 3.69/7.63 GHz and 3.2/5.56/7.28 GHz, respectively. An additional BSF structure without SMD capacitors operated at 3.77/7.16 GHz is as well designed and fabricated. Due to their satisfactory stopband performances, the proposed filters can be useful for various communication systems with dual and triple bands rejection for WiMAX/C bands.