The Receiver

The Receiver

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The receiver is an important element in the transceiver design. The receiver accepts the signal in space from the transmitter and amplifies the signal to a level necessary for detection. The LNA is the main contributor to the NF of the system. The superheterodyne is the most used receiver type and provides the most versatility by being able to apply a common IF. Saturation, compression, sensitivity, DR, reduction in unwanted spurious signals, and maximization of the SNR are the main concerns in designing the receiver. Mixers perform the downconversion process using spur analysis and selecting the correct mixer for the application. Two types of DR include amplitude, which is the most common way to express DR, and frequency DR, related to the two-tone third-order intercept point. Group delay plays an important role in digital communications and careful consideration in the design will help reduce dispersion and ISI. Digital receivers perform most of the detection in data links today, and the ADC is used to translate an analog signal into the digital domain. The sooner the signal is in the digital domain, the better the receiver can optimize the detection process.

Chapter Contents:

  • 3.1 Superheterodyne Receiver
  • 3.1.1 Basic Functions of the Receiver
  • 3.2 Antenna
  • 3.3 Transmit/Receive Control
  • 3.4 Limiters
  • 3.5 Image Reject Filter/Band Reject Filter
  • 3.6 Dynamic Range/Minimum Detectable Signal
  • 3.7 Types of DR
  • 3.7.1 Amplitude DR
  • 3.7.2 Frequency DR
  • 3.7.3 Single-Tone Frequency DR
  • 3.7.4 Two-Tone Frequency DR
  • 3.8 Second- and Third-Order Intermodulation Products
  • 3.9 Calculating Two-Tone Frequency DR
  • 3.10 System DR
  • 3.11 Tangential Sensitivity
  • 3.12 Low-Noise Amplifier
  • 3.13 Downconversion
  • 3.14 Splitting Signals into Multiple Bands for Processing
  • 3.15 Phase Noise
  • 3.16 Mixers
  • 3.16.1 Mixer Spur Analysis
  • 3.16.2 Sixth-Order Analysis
  • 3.17 Bandwidth Constraints
  • 3.18 Filter Constraints
  • 3.19 Group Delay
  • 3.19.1 Group Delay Compensation
  • 3.20 Sampling Theorem and Aliasing
  • 3.21 Anti-Aliasing Filter
  • 3.22 Analog-to-Digital Converter
  • 3.23 Digital Signal Processing
  • 3.24 Summary

Inspec keywords: radio transceivers; low noise amplifiers; analogue-digital conversion

Other keywords: saturation; compression; common IF; spurious signal; spur analysis; frequency DR; amplitude; two-tone third-order intercept point; dispersion reduction; receiver sensitivity; LNA; ISI; digital receiver; transceiver design; group delay; ADC; superheterodyne; SNR maximization

Subjects: Radio links and equipment; Amplifiers; A/D and D/A convertors

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