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An analog-to-digital converter (ADC) converts a signal from its continuous analog representation into a series of finite-resolution samples taken at discrete instances in time. In an ideal receiver, we would place the ADC directly at the antenna to minimize the effects of receiver noise, nonlinearities, and spurious signals. This architecture is not yet practical, so we must first translate the frequency band of interest to a frequency compatible with the ADC input. We must also amplify the antenna output to make use of the ADC's full range. Sampling resolution (i.e., number of bits in the ADC) and sampling rate are the primary ADC parameters we specify. There are also the issues of ADC saturation, nonlinear ADC response, and sampling jitter.

Chapter Contents:

  • 11.1 Introduction
  • 11.2 Nyquist-Shannon Theorem
  • 11.3 Sampling at Discrete Instants in Time
  • 11.4 Sampling with Discrete Resolution
  • 11.5 Sources of Spurious Signals
  • 11.6 Analog-to-Digital Converters
  • 11.7 Using an ADC in an RF System
  • 11.8 Bibliography
  • 11.9 Problems

Inspec keywords: antennas; analogue-digital conversion; signal sampling

Other keywords: analog to digital converter; sampling jitter; spurious signals; sampling resolution; nonlinear ADC response; nonlinearities; digitizing; continuous analog representation; ADC saturation; sampling rate; receiver noise; finite resolution sample; antenna output; frequency band

Subjects: Single antennas; Signal processing theory; A/D and D/A convertors; A/D and D/A convertors; Signal processing and detection

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