Difference between pages "File:I2CIO-8X P1823-720PX.jpg" and "A Termination Insensitive Amplifier for Bidirectional Transceivers"
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+ | [[file:TIA_P1015_720px.jpg]] | ||
+ | [[file:W7Z01_TIA_SMT_P1837-720PX.jpg]] | ||
+ | |||
+ | == W7ZOI 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 | ||
+ | * Bi-directional - amplifiers in both directions | ||
+ | * 50 ohms in/out | ||
+ | * BNC or SMA Connectors | ||
+ | * Transformer-less | ||
+ | * Power applied to one half at a time - determines signal flow direction | ||
+ | * ~30 mA per side | ||
+ | * SMT or Through Hole versions | ||
+ | * SMT version fits in aluminum case | ||
+ | |||
+ | === W7ZOI Schematic === | ||
+ | |||
+ | [[FILE:W7ZOI_SCHEMATIC.PNG]] | ||
+ | |||
+ | === * 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 == | ||
+ | |||
+ | * Single channel | ||
+ | * With SPICE directives | ||
+ | |||
+ | [[file:W7ZOI_SCHEMATIC_KiCAD.PNG]] | ||
+ | |||
+ | * Both channels | ||
+ | * With SPICE directives | ||
+ | |||
+ | [[file:W7ZOI_SCHEMATIC_KiCAD-2.PNG]] | ||
+ | |||
+ | == NGSPICE Simulation == | ||
+ | |||
+ | * NGSPICE run from KiCAD | ||
+ | ** [http://ngspice.sourceforge.net/ngspice-eeschema.html Tutorial: ngspice simulation in KiCad/Eeschema] | ||
+ | * +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]] | ||
+ | |||
+ | * Closely matches | ||
+ | |||
+ | [[file:W7ZOI_Gainz.PNG]] | ||
+ | |||
+ | * Across Band | ||
+ | [[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 == | ||
+ | |||
+ | === Through Hole CAD === | ||
+ | |||
+ | * 2.4" x 2.4" | ||
+ | * 2.0 hole center-to-center | ||
+ | |||
+ | [[FILE:W7ZOI_CAD.PNG]] | ||
+ | |||
+ | === SMT CAD === | ||
+ | |||
+ | [[FILE:W7ZOI_TIA_SMT_CAD.PNG]] | ||
+ | |||
+ | == Test Procedure == | ||
+ | |||
+ | * Unit Under Test (UUT) | ||
+ | * NanoVNA | ||
+ | * 30 dB attenuatator | ||
+ | * (3) SMA to SMA m:m cables | ||
+ | |||
+ | == Videos == | ||
+ | |||
+ | <video type="youtube">JjcxEYk9atg</video> | ||
+ | |||
+ | <video type="youtube">CpQK0W7TY5g</video> | ||
+ | |||
+ | <video type="youtube">7TtKE39TWpI</video> | ||
+ | |||
+ | <video type="youtube">T8lq8Qtjqe0</video> | ||
+ | |||
+ | == Assembly Sheet == | ||
+ | |||
+ | * [[W7ZOI TIA Assembly Sheet - Rev 1]] - Through-hole version | ||
+ | * [[W7ZOI TIA SMT Assembly Sheet - Rev 1]] - SMT version |
Revision as of 00:28, 26 March 2022
Contents
W7ZOI Design
- Paper - A Termination Insensitive Amplifier for Bidirectional Transceivers - W7ZOI (Wes Hayward) design
- Transistor Models and the Feedback Amplifier
- Termination Insensitive - input impedance that does not depend upon the output load
- Bi-directional - amplifiers in both directions
- 50 ohms in/out
- BNC or SMA Connectors
- Transformer-less
- Power applied to one half at a time - determines signal flow direction
- ~30 mA per side
- SMT or Through Hole versions
- SMT version fits in aluminum case
W7ZOI Schematic
* Use
- Between RF/LO mixer (IF output/input) and crystal filter
- Between Crystal Filter and Product Detector / Balanced Modulator
Schematic in KiCAD
- Single channel
- With SPICE directives
- Both channels
- With SPICE directives
NGSPICE Simulation
- NGSPICE run from KiCAD
- +24 dB @12V
- 2N3904 Alternate Node Sequence (MMBT3903 - SOT23)
- KiCAD order 1 2 3 is the SPICE normal order
- NGSPICE order: 3 1 2
- Closely matches
- Across Band
Measurements
- Powering only L-R side
- 30 mA power supply current
- 12V
NanoVNA Measurements (Through-hole)
Left-to-right flow
- At 9 MHz
- S21 - sweep 1-30 MHz
- S11 VSWR - sweep 1-30 MHz
Right-to-Left flow
- At 9 MHz
- S21 - sweep 1-30 MHz
- S11 VSWR - sweep 1-30 MHz
NanoVNA Measurements (SMT)
- Re = 150
- A bit more gain
Left-to-right flow
- At 9 MHz
- S21 - sweep 1-30 MHz
- S11 VSWR - sweep 1-30 MHz
Right-to-Left flow
- At 9 MHz
- S21 - sweep 1-30 MHz
- S11 VSWR - sweep 1-30 MHz
CAD
Through Hole CAD
- 2.4" x 2.4"
- 2.0 hole center-to-center
SMT CAD
Test Procedure
- Unit Under Test (UUT)
- NanoVNA
- 30 dB attenuatator
- (3) SMA to SMA m:m cables
Videos
Assembly Sheet
- W7ZOI TIA Assembly Sheet - Rev 1 - Through-hole version
- W7ZOI TIA SMT Assembly Sheet - Rev 1 - SMT version
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