Difference between revisions of "A Termination Insensitive Amplifier for Bidirectional Transceivers"
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=== NanoVNA Measurements === | === NanoVNA Measurements === | ||
| − | * | + | * At 9 MHz |
[[file:L-R_1-30MHz_meas.png]] | [[file:L-R_1-30MHz_meas.png]] | ||
| + | |||
| + | * S21 - sweep 1-30 MHz | ||
[[file:L-R_1-30MHz_S21.png]] | [[file:L-R_1-30MHz_S21.png]] | ||
| − | * S11 | + | * S11 VSWR - sweep 1-30 MHz |
[[file:L-R_1-30MHz_S11.png]] | [[file:L-R_1-30MHz_S11.png]] | ||
Revision as of 16:29, 25 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
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
- At 9 MHz
- S21 - sweep 1-30 MHz
- S11 VSWR - sweep 1-30 MHz
CAD
SMT Build
Videos
Assembly Sheet
- W7ZOI TIA Assembly Sheet - Rev 1 - Through-hole version
- W7ZOI TIA SMT Assembly Sheet - Rev 1 - SMT version
