Difference between revisions of "A Termination Insensitive Amplifier for Bidirectional Transceivers"

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[[file:W7ZOI_TIA_3D.png]]
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== A Termination Insensitive Amplifier for Bidirectional Transceivers ==
 +
 
 +
=== Through Hole Version ===
 +
 
 +
[[file:TIA_P1015_720px.jpg]]
 +
 
 +
=== Surface Mount Version ===
 +
 
 +
[[file:W7Z01_TIA_SMT_P1837-720PX.jpg]]
  
 
== W7ZOI Design ==
 
== W7ZOI Design ==
  
−
Paper - [http://w7zoi.net/bidirectional_matched_amplifier.pdf A Termination Insensitive Amplifier for Bidirectional Transceivers] - W7ZOI (Wes Hayward) design
+
* Paper - [http://w7zoi.net/bidirectional_matched_amplifier.pdf A Termination Insensitive Amplifier for Bidirectional Transceivers] - W7ZOI (Wes Hayward) design
−
 
+
* [http://w7zoi.net/transistor_models_and_the_fba.pdf Transistor Models and the Feedback Amplifier]
 
* Termination Insensitive - input impedance that does not depend upon the output load
 
* Termination Insensitive - input impedance that does not depend upon the output load
 
* Bi-directional - amplifiers in both directions
 
* Bi-directional - amplifiers in both directions
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* Transformer-less
 
* Transformer-less
 
* Power applied to one half at a time - determines signal flow direction
 
* Power applied to one half at a time - determines signal flow direction
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* Use
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* ~30 mA per side
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** Between RF/LO mixer (IF output/input) and crystal filter
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* SMT or Through Hole versions
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** Between Crystal Filter and Product Detector / Balanced Modulator
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** SMT version fits in 80x50x20mm aluminum case
 +
 
 +
=== W7ZOI Schematic ===
  
 
[[FILE:W7ZOI_SCHEMATIC.PNG]]
 
[[FILE:W7ZOI_SCHEMATIC.PNG]]
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 +
=== * Use ===
 +
 +
* Between RF/LO mixer (IF output/input) and crystal filter
 +
* Between Crystal Filter and Product Detector / Balanced Modulator
 +
 +
[[file:FARHADPNG.PNG]]
  
 
== Schematic in KiCAD ==
 
== Schematic in KiCAD ==
  
 +
* [http://land-boards.com/W7ZOI_TIA/W7ZOI_TIA_SCHEMATIC_REV1.pdf Schematic] (pdf file)
 
* Single channel
 
* Single channel
 
* With SPICE directives
 
* With SPICE directives
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* NGSPICE run from KiCAD
 
* NGSPICE run from KiCAD
 +
** [http://ngspice.sourceforge.net/ngspice-eeschema.html Tutorial: ngspice simulation in KiCad/Eeschema]
 
* +24 dB @12V
 
* +24 dB @12V
 +
* 2N3904 Alternate Node Sequence (MMBT3903 - SOT23)
 +
** KiCAD order 1 2 3 is the SPICE normal order
 +
** NGSPICE order: 3 1 2
  
 
[[file:W7ZOI_Simulation_KiCAD-3.PNG]]
 
[[file:W7ZOI_Simulation_KiCAD-3.PNG]]
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* Across Band
 
* Across Band
 
[[file:W7ZOI_Simulation_KiCAD_S2.PNG]]
 
[[file:W7ZOI_Simulation_KiCAD_S2.PNG]]
 +
 +
== Measurements ==
 +
 +
* Powering only L-R side
 +
* 30 mA power supply current
 +
* 12V
 +
 +
=== NanoVNA Measurements (Through-hole) ===
 +
 +
==== Left-to-right flow ====
 +
 +
* At 9 MHz
 +
 +
[[file:L-R_1-30MHz_meas.png]]
 +
 +
* S21 - sweep 1-30 MHz
 +
 +
[[file:L-R_1-30MHz_S21.png]]
 +
 +
* S11 VSWR - sweep 1-30 MHz
 +
 +
[[file:L-R_1-30MHz_S11.png]]
 +
 +
==== Right-to-Left flow ====
 +
 +
* At 9 MHz
 +
 +
[[file:R-L_1-30MHz_meas.png]]
 +
 +
* S21 - sweep 1-30 MHz
 +
 +
[[file:R-L__1-30MHz_S21.png]]
 +
 +
* S11 VSWR - sweep 1-30 MHz
 +
 +
[[file:R-L_1-30MHz_S11.png]]
 +
 +
=== NanoVNA Measurements (SMT) ===
 +
 +
* Re = 150
 +
** A bit more gain
 +
 +
==== Left-to-right flow ====
 +
 +
* At 9 MHz
 +
 +
[[file:L-R_1-30MHz_meas_SMT.png]]
 +
 +
* S21 - sweep 1-30 MHz
 +
 +
[[file:L-R_1-30MHz_S21_SMT.png]]
 +
 +
* S11 VSWR - sweep 1-30 MHz
 +
 +
[[file:L-R_1-30MHz_S11_SMT.png]]
 +
 +
==== Right-to-Left flow ====
 +
 +
* At 9 MHz
 +
 +
[[file:R-L_1-30MHz_meas_SMT.png]]
 +
 +
* S21 - sweep 1-30 MHz
 +
 +
[[file:R-L__1-30MHz_S21_SMT.png]]
 +
 +
* S11 VSWR - sweep 1-30 MHz
 +
 +
[[file:R-L_1-30MHz_S11_SMT.png]]
  
 
== CAD ==
 
== CAD ==
 +
 +
=== Through Hole CAD ===
 +
 +
* 2.4" x 2.4"
 +
* 2.0 hole center-to-center
  
 
[[FILE:W7ZOI_CAD.PNG]]
 
[[FILE:W7ZOI_CAD.PNG]]
 +
 +
=== SMT CAD ===
 +
 +
[[FILE:W7ZOI_TIA_SMT_CAD.PNG]]
 +
 +
== Test Procedure ==
 +
 +
=== Test Equipment ===
 +
 +
* Unit Under Test (UUT)
 +
* [[NanoVNA]]
 +
* [[RF_Attenuators#Triple_Attenuator|30 dB attenuator]] tap on Triple attenuator
 +
* [[NanoVNA#RF_Demo_Kit|RF Demo Kit]]
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* (3) SMA to SMA Male:Male cables
 +
* [[Benchtop Power Supply DPS3005]]
 +
** 12V Power Supply
 +
** Current Limit set at 100 mA
 +
 +
=== Calibrate NanoVNA ===
 +
 +
* 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 ===
 +
 +
* Replace RF Demo Kit with UUT
 +
* Test each direction at a time
 +
** Power up Left to right, test
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** Power up right to left, test
 +
* Should show gain of about 20 dB at 10  MHz
 +
 +
== Enclosure ==
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 +
* The SMT version is designed to fit in a [https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=80x50x20mm&_sacat=0 80x50x20mm Extruded Aluminum Project Box]
 +
* [http://land-boards.com/W7ZOI_TIA/W7ZOI_TIA_SMD_CUTOUTS.pdf W7ZOI_TIA_SMD_CUTOUTS.pdf Panel marking template]
 +
 +
[[file:Dimensions_80x50x20.jpg]]
 +
 +
== Videos ==
 +
 +
<video type="youtube">JjcxEYk9atg</video>
 +
 +
<video type="youtube">CpQK0W7TY5g</video>
 +
 +
<video type="youtube">7TtKE39TWpI</video>
 +
 +
<video type="youtube">T8lq8Qtjqe0</video>
  
 
== Assembly Sheet ==
 
== Assembly Sheet ==
  
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* [[W7ZOI TIA Assembly Sheet - Rev 1]]
+
* [[W7ZOI TIA Assembly Sheet - Rev 1]] - Through-hole version
 +
* [[W7ZOI TIA SMT Assembly Sheet - Rev 1]] - SMT version

Latest revision as of 12:13, 26 March 2022

A Termination Insensitive Amplifier for Bidirectional Transceivers

Through Hole Version

TIA P1015 720px.jpg

Surface Mount Version

W7Z01 TIA SMT P1837-720PX.jpg

W7ZOI Design

W7ZOI Schematic

W7ZOI SCHEMATIC.PNG

* Use

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

FARHADPNG.PNG

Schematic in KiCAD

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

W7ZOI SCHEMATIC KiCAD.PNG

  • Both channels
  • With SPICE directives

W7ZOI SCHEMATIC KiCAD-2.PNG

NGSPICE Simulation

W7ZOI Simulation KiCAD-3.PNG

  • Closely matches

W7ZOI Gainz.PNG

  • Across Band

W7ZOI Simulation KiCAD S2.PNG

Measurements

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

NanoVNA Measurements (Through-hole)

Left-to-right flow

  • 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

  • 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)

  • Re = 150
    • A bit more gain

Left-to-right flow

  • 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

  • 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

Through Hole CAD

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

W7ZOI CAD.PNG

SMT CAD

W7ZOI TIA SMT CAD.PNG

Test Procedure

Test Equipment

Calibrate NanoVNA

  • 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

  • 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

Dimensions 80x50x20.jpg

Videos

Assembly Sheet

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