Frequency Downconverters

Frequency Downconverters

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This chapter will discuss both schemes of frequency conversion, the one-channel and two-channel conversions. Both analog and digital frequency conversions will be discussed. Several digital approaches to create the I and Q channels will also be discussed. The impact of imbalance between the land Q channels on the receiver performance will be presented. Finally, a correction scheme to rectify the l and Q channels imbalance will be discussed.

Chapter Contents:

  • 8.1 Introduction
  • 8.2 Baseband Receiver Frequency Selection
  • 8.3 Frequency Conversion
  • 8.4 In-Phase (I) and Quad-Phase (Q) Channel Conversion
  • 8.5 Imbalance in I and Q Channels
  • 8.6 Analog I and Q Downconverters
  • 8.7 Digital Approach to Generate I and Q Channels
  • 8.8 Hilbert Transform
  • 8.9 Discrete Hilbert Transform
  • 8.10 Examples on Discrete Hilbert Transform
  • 8.11 Narrowband I and Q Channels Through a Special Sampling Scheme
  • 8.12 Wideband I and Q Channels Through a Special Sampling Scheme
  • 8.13 Hardware Considerations on Filter Design for Wideband Digital I-Q Channels
  • 8.14 Digital Correction of I and Q Channel Imbalance
  • References
  • Appendix 8.A

Inspec keywords: frequency convertors

Other keywords: receiver performance; frequency downconverters; Q-channel imbalance; in-phase channel conversion; quad-phase channel conversion; two-channel conversions; one-channel conversion; analog frequency conversions; digital frequency conversions; I-channel imbalance

Subjects: Convertors

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