Difference between pages "SMA-HDRS" and "A Termination Insensitive Amplifier for Bidirectional Transceivers"
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− | + | [[file:W7ZOI_TIA_3D.png]] | |
− | + | == 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 | ||
+ | * Use | ||
+ | ** Between RF/LO mixer (IF output/input) and crystal filter | ||
+ | ** Between Crystal Filter and Product Detector / Balanced Modulator | ||
− | + | [[FILE:W7ZOI_SCHEMATIC.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]] | ||
+ | |||
+ | == CAD == | ||
+ | |||
+ | [[FILE:W7ZOI_CAD.PNG]] | ||
+ | |||
+ | == SMT Build == | ||
+ | |||
+ | [[FILE:W7ZOI_TIA_SMD_3D.png]] | ||
+ | |||
+ | [[FILE:W7ZOI_TIA_SMT_CAD.PNG]] | ||
+ | |||
+ | == Videos == | ||
+ | |||
+ | <video type="youtube">JjcxEYk9atg</video> | ||
+ | |||
+ | <video type="youtube">T8lq8Qtjqe0</video> | ||
+ | |||
+ | == Assembly Sheet == | ||
+ | |||
+ | * [[W7ZOI TIA Assembly Sheet - Rev 1]] |
Revision as of 10:41, 12 November 2021
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
- 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
CAD
SMT Build
Videos