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Electrical Communications Systems ECE.09.331 Spring 2007. Lab 3: Pre-lab Instruction. Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring07/ecomms/. ECOMMS: Topics. Plan. FM Signal and Spectrum FM Detection Slope Detector FM Generation

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Electrical Communications Systems ECE.09.331 Spring 2007


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    1. Electrical Communications SystemsECE.09.331Spring 2007 Lab 3: Pre-lab Instruction Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/spring07/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 http://engineering.rowan.edu/~shreek/spring07/ecomms/lab3.html

    13. Summary