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Electrical Communications Systems ECE.09.331 Spring 2009

This lab project focuses on frequency modulation (FM) signal generation, detection, and analysis. Students will learn about the FM spectrum and detection methods such as slope detection and the use of voltage-controlled oscillators (VCO) and phase-locked loops (PLL). The course covers critical concepts including the Barkhausen criteria for oscillation, the role of amplifiers, and the operation of Schmitt trigger oscillators. By the end of this lab, students will have a comprehensive understanding of FM signals, detection mechanisms, and practical applications in communication systems.

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Electrical Communications Systems ECE.09.331 Spring 2009

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  1. Electrical Communications SystemsECE.09.331Spring 2009 Lab 3: Pre-lab Instruction Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring09/ecomms/

  2. ECOMMS: Topics

  3. Plan • FM Signal and Spectrum • FM Detection • Slope Detector • FM Generation • Voltage Controlled Oscillator (VCO) • Phase Locked Loop (PLL) • FM Detection • Lab Project 3

  4. J1(b) |S(f)| / (Ac/2) J2(b) J3(b) J0(b) 0fc-3fm fc-2fm fc-fm fc fc+fm fc+2fm fc+3fm f FM Signal & Spectrum Single-tone FM Signal Single-tone FM Spectrum

  5. FM Detection FM Signal, We need a frequency-voltage converter Slope Detector

  6. Frequency- voltage converter AM Detector LPF Envelope Detector |H(f)| vo(t) f fi(t) t Slope Detector

  7. FM Generation Voltage Controlled Oscillator f0=fc Control Voltage Instantaneous Frequency m(t)

  8. Signal Source Amplifier vi + Output A S vo vs - b Feedback Network Oscillators: Principle Barkhausen Criteria for oscillation: Ab = -1

  9. Oscillators Waveforms Schmitt Trigger Oscillator

  10. v10 Flip-Flop Changes State Switch Open, C charges Switch Closed, C discharges Vc1 t Vc2 Intersil 8038 Precision Waveform Generator/Voltage Controlled Oscillator

  11. fi -fvco Phase Detector LPF A fi vo Loop Filter fvco VCO Phase Locked Loop Hold (lock) Range, fH Capture Range, fC f fo

  12. Lab Project 3:Frequency Modulation and Detection

  13. Summary

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