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FM Signal Processing and Detection Techniques - Lab 3 Overview

This document provides pre-lab instructions for Lab 3 in the Electrical Communications Systems course at Rowan University, focusing on frequency modulation (FM) and its associated techniques. Key topics include the generation and detection of FM signals, the use of voltage-controlled oscillators (VCOs), and phase-locked loops (PLLs). Students will learn concepts such as FM signal spectra, slope detection, and the role of feedback networks in oscillators. The lab aims to equip students with practical skills in FM signal processing through hands-on projects.

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FM Signal Processing and Detection Techniques - Lab 3 Overview

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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

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