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5968-3579E_Testing and Troubleshooting Digital RF Communications Receiver Designs Testing and Troubleshooting Digital RF Communications Receiver Designs
Application Note 1314

I

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Wireless Test Solutions

Table of Contents

Page

Page

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2 3 3 3 4 4 5

Introduction
1. Digital Radio Communications Systems 1.1 Digital Radio Transmitter 1.2 Digital Radio Receiver 1.2.1 I/Q Demodulator Receiver 1.2.2 Sampled IF Receiver 1.2.3 Automatic Gain Control (AGC) 1.3 Filtering in Digital RF Communications Systems

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15 15 16 17 17 18 19 19

3. Troubleshooting Receiver Designs
3.1 Troubleshooting Steps 3.2 Signal Impairments and Ways to Detect Them 3.2.1 I/Q Impairments 3.2.2 Interfering Tone or Spur 3.2.3 Incorrect Symbol Rate 3.2.4 Baseband Filtering Problems 3.2.5 IF Filter Tilt or Ripple 3.3 Table of Impairments Versus Parameters Affected

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2. Rece