This demonstration project
built on a 16 MHz DDS source and a A and B detectors to make
a full stimulus - response network analyzer that can be
built by nearly anyone at a fraction of the cost of a
commercial unit. This was a very popular project that showed
just how much could be done by a determined homebrewer! The
DDS synthesizer, built in source has 1 Hz resolution over
the full 10 Hz to 16 MHz MHz output range. Excellent phase
noise and spurious response performance is also achieved.
Also included in the design is a novel output leveling
circuit which provides four output levels over the entire
frequency range. The analyzer is really a virtual instrument
with all it's functions being controlled by a PIC
Microcontroller via a PC control program that was written in
Visual Basic. Communications to the PC is via a low cost 4.8
k Baud RS232 link.
- Built with only 15
- True stimulus response
scalar network analyzer.
- 60 dB plus dynamic
range, better than 0.25 dB resolution.
- 10 Hz to 16 MHz output
range with 1 Hz resolution.
- Four output levels at up
to 5 volts p-p maximum..
- PC Control via virtual
front panel application program.
- RS232 communication (or
USB) link to the PC.
- On board PIC
- Spurious responses below
- Harmonics below -20
- Phase noise = -120
dBc/Hz at 10 kHz offset.
- Wide band signal path,
no switching from 10 Hz to 16 MHz (9 octaves).
- Shielded, modular