Vector Network Analyzer

Interesting links

Some interesting links on network analyzers:

• VNA Operating Guide

• Three-Bead-Balun Reflection Bridge

• Ham VNA

• Introduction to Network Analyzer Measurements

Hardware

The basic blocks of the system are shown in the following diagram:

The projects/vna_122_88 directory contains one Tcl file block_design.tcl that instantiates, configures and interconnects all the needed IP cores.

Software

The projects/vna_122_88/server directory contains the source code of the TCP server (vna.c) that receives control commands and transmits the data to the control program running on a remote PC.

The projects/vna/client directory contains the source code of the control program (vna.py).

Getting started with MS Windows

• Download SD card image zip file (more details about the SD card image can be found at this link).
• Copy the contents of the SD card image zip file to a micro SD card.
• Optionally, to start the application automatically at boot time, copy its start.sh file from apps/vna_122_88 to the topmost directory on the SD card.
• Install the micro SD card in the STEMlab SDR board and connect the power.
• Download and unpack the release zip file.
• Run the vna.exe program in the control directory.
• Type in the IP address of the STEMlab SDR board and press Connect button.
• Perform calibration and measurements.

Getting started with GNU/Linux

• Download SD card image zip file (more details about the SD card image can be found at this link).
• Copy the contents of the SD card image zip file to a micro SD card.
• Optionally, to start the application automatically at boot time, copy its start.sh file from apps/vna_122_88 to the topmost directory on the SD card.
• Install the micro SD card in the STEMlab SDR board and connect the power.
• Install required Python libraries:

sudo apt-get install python3-numpy python3-matplotlib python3-pyqt5

• Clone the source code repository:

git clone https://github.com/pavel-demin/red-pitaya-notes

• Run the control program:

cd red-pitaya-notes/projects/vna/client
python3 vna.py

• Type in the IP address of the STEMlab SDR board and press Connect button.
• Perform calibration and measurements.

Building from source

The installation of the development machine is described at this link.

The structure of the source code and of the development chain is described at this link.

Setting up the Vitis and Vivado environment:

source /opt/Xilinx/Vitis/2023.1/settings64.sh

Cloning the source code repository:

git clone https://github.com/pavel-demin/red-pitaya-notes
cd red-pitaya-notes

Building vna_122_88.bit:

make NAME=vna_122_88 PART=xc7z020clg400-1 bit

Building SD card image zip file:

source helpers/build-all.sh