Lab Group L2Bx EECE 380 – Electrical Engineering Design Studio (Spring 2014) 1 Spectrum Analyzer Michael Halpenny-Mason, Presenter 2, Presenter 3, Presenter.

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Presentation transcript:

Lab Group L2Bx EECE 380 – Electrical Engineering Design Studio (Spring 2014) 1 Spectrum Analyzer Michael Halpenny-Mason, Presenter 2, Presenter 3, Presenter 4 & Presenter 5

Lab Group L2Bx EECE 380 – Electrical Engineering Design Studio (Spring 2014) 2 Device Requirements and Problem Definition Custom built spectrum analyzer –80Mhz-120Mhz frequency range –0dBm to -40dBm power range –Selectable resolution bandwidth Provide a basis for FM signal analysis –Modulation index –Modulation type –Carrier frequency Utilize given components and hierarchical block diagram Construct additional subsystems Implement supporting labVIEW system via myDAQ –Collect data –Calculate data –Display data –Provide user interface RequirementsDefined Problem

Lab Group L2Bx Design solution EECE Electrical Engineering Design Studio (Spring 2014) 3 X VCO Amplifier BP Filter Mixer Switch Amplifier Crystal Filter Peak Detector myDAQ Amplifier Crystal Filter Peak Detector RF input

Lab Group L2Bx Hardware Implementation PCB –Complete system on single board –Precision IC peak detectors (- 40dBm) –0dBm to -65dBm power range (estimated) –Time and money constraints Prototype board –Diode-based peak detection (- 25dBm) –UBC switch PCB EECE Electrical Engineering Design Studio (Spring 2014) 4

Lab Group L2Bx Software Implementation Calibrated measurement calculation for peak detectors Graphic User Interface for spectrum display and resolution bandwidth selection Error correction and dynamic data acquisition based on GUI input EECE Electrical Engineering Design Studio (Spring 2014) 5

Lab Group L2Bx Results and Observations -5dBm to -40dBm power range –<15% error 86Mhz to 120Mhz frequency range –<2% error Automatic FM calculation for modulation index EECE Electrical Engineering Design Studio (Spring 2014) 6 Mixer-Crystal Ladder Feedback Inconsistent non-linear VCO curve

Lab Group L2Bx Questions? EECE Electrical Engineering Design Studio (Spring 2014) 7