Amplifier and Analog-to-Digital Converter Interface

Amplifier and Analog-to-Digital Converter Interface

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The main purpose of this chapter is to present an optimum way to match the radio frequency (RF) amplifier with the ADC. The word optimum means to obtain a certain sensitivity and dynamic range, desired by the designer, within the limits of the amplifier performance and the ADC. The important parameters for the ADC are the number of bits, maximum sampling frequency, and input power level. It is assumed that the performance of the ADC is ideal. The lower limit of the dynamic range is the noise level rather than the spur levels because the spur levels are difficult to predict, as discussed in the Chapter 6. This same approach can be used to design with nonideal ADCs. For nonideal ADCs, the lower limit of the dynamic range should be considered as limited by the spur's response rather than the noise level.

Chapter Contents:

  • 7.1 Introduction
  • 7.2 Key Component Selection
  • 7.3 Notations
  • 7.4 Comparison Sensitivity of Analog and Digital Receivers
  • 7.5 Noise Figure and Third-Order Intercept Point
  • 7.6 Characteristics of the Amplifiers in Cascade
  • 7.7 Analog-to-Digital Converter
  • 7.8 Noise Figure of Amplifier and ADC Combination
  • 7.9 Amplifier and ADC Interface
  • 7.10 The Meaning of M and M'
  • 7.11 Computer Program and Results
  • 7.12 Design Example
  • 7.13 Experimental Results
  • 7.13.1 Noise Figure Measurement
  • 7.13.2 Dynamic Range Test
  • References
  • Appendix 7.A
  • Appendix 7.B

Inspec keywords: analogue-digital conversion; radiofrequency amplifiers

Other keywords: RF amplifier; analog-to-digital converter interface; radio frequency amplifier; ADC

Subjects: Amplifiers; A/D and D/A convertors; A/D and D/A convertors

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