Radio Frequency Transceiver Design

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Radio Frequency Transceiver Design

• Heidi L. Lagares
• Advisor Rafael Solis

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Introduction

• Microwave engineering involves circuit analysis
  and design, in contrast to the field theory
  orientation of a generation ago.
• Microwave Engineering is not only apply
  sophisticate mathematics.

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Radio Frequency Transceiver Design

• A transceiver is a combination transmitter/receive
  r in a single package.
• Some are design to allow reception of signals
  during transmission periods.
• An RF transceiver is propose as an alternative to
  test design through a wireless RF link.

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Block Diagram of a RF transceiver
Antenna
Mixer
Amplifier
Amplifier
Mixer
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Radio Frequency (RF)

• RF is a term that refers to alternating current
  (AC) having characteristics such that, if the
  current is input to an antenna, an
  electromagnetic (EM) field is generated suitable
  for wireless communications.
• Examples Cordless and cellular telephone, radio
  and television broadcast stations, satellite
  communications systems.

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Analysis

• The analysis of RF transceiver will be performed
  using electromagnetic simulator.
• The design will resonate at 5.85 GHz, and with a
  bandwidth of 125 MHz.
• Maximum Gain Amplifier
• Low Noise Amplifier
• Mixer

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Maximum Gain Amplifier

• Amplification is one of the most basic and
  prevalent communication circuit functions.
• The overall gain of an amplifier will be
  controlled by the gains GS and GL (input gain and
  out gain respectively).

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Maximum Gain Amplifier Results

• The maximum gain amplifier has gain of 15.6 dB.

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Low Noise Amplifier

• An important design for amplifier is the noise
  figure.
• A low noise was designed with a GaAs field effect
  transistor operating at the desired frequency.

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Low Noise Amplifier Results

• As the graph shows, the amplifier gain is 13.7dB.
  
• S11 (black marker) is at -4.7 dB.

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Mixer

• Mixers use nonlinear device to achieve frequency
  conversion of an input signal.
• When signals of different frequencies are applied
  to such a device, the output contains not only
  the original frequencies but also frequencies
  equal to the sum and difference of the original
  frequencies.

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Structure of the mixer design

• This is the basis structure of the mixer design.

RF
Matching network
Rat Race (180 hybrid)
IF
LP Filter
LO
Matching network
Singly Balanced Mixer
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Mixer Design
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Mixer Results

• The conversion gain is -25dB (the first impulse
  at 0GHZ)

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Radio Frequency Transceiver
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Conclusion

• Researchers, designers and students work in the
  development of complex data processing and
  modulation circuits using DSP development kits.
• They should test their designs in a more real
  environment and transmit and receive data
  acoustically.

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Questions?