Difference between revisions of "A Termination Insensitive Amplifier for Bidirectional Transceivers"
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* 12V | * 12V | ||
| − | === NanoVNA Measurements === | + | === NanoVNA Measurements (Through-hole) === |
==== Left-to-right flow ==== | ==== Left-to-right flow ==== | ||
| Line 91: | Line 91: | ||
[[file:R-L_1-30MHz_S11.png]] | [[file:R-L_1-30MHz_S11.png]] | ||
| + | |||
| + | === NanoVNA Measurements (SMT) === | ||
| + | |||
| + | ==== 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 == | ||
Revision as of 21:30, 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
- 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)
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
Videos
Assembly Sheet
- W7ZOI TIA Assembly Sheet - Rev 1 - Through-hole version
- W7ZOI TIA SMT Assembly Sheet - Rev 1 - SMT version
