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| − | [[file:W7ZOI_TIA_3D.png]]
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| − | == W7ZOI Design ==
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| − |
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| − | * Paper - [http://w7zoi.net/bidirectional_matched_amplifier.pdf A Termination Insensitive Amplifier for Bidirectional Transceivers] - W7ZOI (Wes Hayward) design
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| − | * [http://w7zoi.net/transistor_models_and_the_fba.pdf Transistor Models and the Feedback Amplifier]
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| − | * Termination Insensitive - input impedance that does not depend upon the output load
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| − | * Bi-directional - amplifiers in both directions
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| − | * 50 ohms in/out
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| − | * BNC or SMA Connectors
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| − | * Transformer-less
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| − | * Power applied to one half at a time - determines signal flow direction
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| − | * Use
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| − | ** Between RF/LO mixer (IF output/input) and crystal filter
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| − | ** Between Crystal Filter and Product Detector / Balanced Modulator
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| − |
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| − | [[FILE:W7ZOI_SCHEMATIC.PNG]]
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| − |
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| − | == Schematic in KiCAD ==
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| − |
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| − | * Single channel
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| − | * With SPICE directives
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| − |
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| − | [[file:W7ZOI_SCHEMATIC_KiCAD.PNG]]
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| − |
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| − | * Both channels
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| − | * With SPICE directives
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| − |
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| − | [[file:W7ZOI_SCHEMATIC_KiCAD-2.PNG]]
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| − |
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| − | == NGSPICE Simulation ==
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| − |
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| − | * NGSPICE run from KiCAD
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| − | ** [http://ngspice.sourceforge.net/ngspice-eeschema.html Tutorial: ngspice simulation in KiCad/Eeschema]
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| − | * +24 dB @12V
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| − | * 2N3904 Alternate Node Sequence (MMBT3903 - SOT23)
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| − | ** KiCAD order 1 2 3 is the SPICE normal order
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| − | ** NGSPICE order: 3 1 2
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| − |
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| − | [[file:W7ZOI_Simulation_KiCAD-3.PNG]]
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| − |
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| − | * Closely matches
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| − |
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| − | [[file:W7ZOI_Gainz.PNG]]
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| − |
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| − | * Across Band
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| − | [[file:W7ZOI_Simulation_KiCAD_S2.PNG]]
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| − | == CAD ==
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| − |
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| − | [[FILE:W7ZOI_CAD.PNG]]
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| − |
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| − | == SMT Build ==
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| − |
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| − | [[FILE:W7ZOI_TIA_SMD_3D.png]]
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| − |
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| − | [[FILE:W7ZOI_TIA_SMT_CAD.PNG]]
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| − |
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| − | == Videos ==
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| − |
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| − | <video type="youtube">JjcxEYk9atg</video>
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| − |
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| − | <video type="youtube">T8lq8Qtjqe0</video>
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| − |
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| − | == Assembly Sheet ==
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| − |
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| − | * [[W7ZOI TIA Assembly Sheet - Rev 1]]
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Latest revision as of 12:32, 13 November 2021
