A Termination Insensitive Amplifier for Bidirectional Transceivers

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A Termination Insensitive Amplifier for Bidirectional Transceivers[edit]

Through Hole Version[edit]

TIA P1015 720px.jpg

Surface Mount Version[edit]

W7Z01 TIA SMT P1837-720PX.jpg

W7ZOI Design[edit]

W7ZOI Schematic[edit]

W7ZOI SCHEMATIC.PNG

* Use[edit]

  • Between RF/LO mixer (IF output/input) and crystal filter
  • Between Crystal Filter and Product Detector / Balanced Modulator

FARHADPNG.PNG

Schematic in KiCAD[edit]

  • Schematic (pdf file)
  • Single channel
  • With SPICE directives

W7ZOI SCHEMATIC KiCAD.PNG

  • Both channels
  • With SPICE directives

W7ZOI SCHEMATIC KiCAD-2.PNG

NGSPICE Simulation[edit]

W7ZOI Simulation KiCAD-3.PNG

  • Closely matches

W7ZOI Gainz.PNG

  • Across Band

W7ZOI Simulation KiCAD S2.PNG

Measurements[edit]

  • Powering only L-R side
  • 30 mA power supply current
  • 12V

NanoVNA Measurements (Through-hole)[edit]

Left-to-right flow[edit]

  • At 9 MHz

L-R 1-30MHz meas.png

  • S21 - sweep 1-30 MHz

L-R 1-30MHz S21.png

  • S11 VSWR - sweep 1-30 MHz

L-R 1-30MHz S11.png

Right-to-Left flow[edit]

  • At 9 MHz

R-L 1-30MHz meas.png

  • S21 - sweep 1-30 MHz

R-L 1-30MHz S21.png

  • S11 VSWR - sweep 1-30 MHz

R-L 1-30MHz S11.png

NanoVNA Measurements (SMT)[edit]

  • Re = 150
    • A bit more gain

Left-to-right flow[edit]

  • At 9 MHz

L-R 1-30MHz meas SMT.png

  • S21 - sweep 1-30 MHz

L-R 1-30MHz S21 SMT.png

  • S11 VSWR - sweep 1-30 MHz

L-R 1-30MHz S11 SMT.png

Right-to-Left flow[edit]

  • At 9 MHz

R-L 1-30MHz meas SMT.png

  • S21 - sweep 1-30 MHz

R-L 1-30MHz S21 SMT.png

  • S11 VSWR - sweep 1-30 MHz

R-L 1-30MHz S11 SMT.png

CAD[edit]

Through Hole CAD[edit]

  • 2.4" x 2.4"
  • 2.0 hole center-to-center

W7ZOI CAD.PNG

SMT CAD[edit]

W7ZOI TIA SMT CAD.PNG

Test Procedure[edit]

Test Equipment[edit]

Calibrate NanoVNA[edit]

  • Cable #1 from RF out of NanoVNA (upper jack) to left side of 30 dB attenuator
  • Cable #2 from right side of 30 dB attenuator to left side of RF Demo Kit
    • Multiple positions for open, through, and short
  • Cable #3 from right side of RF Demo Kit to input of NanoVNA (lower jack)

Test UUT[edit]

  • Replace RF Demo Kit with UUT
  • Test each direction at a time
    • Power up Left to right, test
    • Power up right to left, test
  • Should show gain of about 20 dB at 10 MHz

Enclosure[edit]

Dimensions 80x50x20.jpg

Videos[edit]

Assembly Sheet[edit]