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The
Vector-SoC is a low-cost RF vectorial network analyzer
(VNA) built around a CY8C26443 chip. The testing instrument
is designed to apply a frequency ramp to a device being
tested, measure the signal at the output of the device,
and plot the corresponding gain and phase transfer curves
over frequency. The Vector-SoC accurately measures and
displays frequency responses as narrow as a SAW filter.
The device gives an accurate and stable display thanks
to the automatic calibration routines.
Key
specifications of the Vector-SoC include: a PC-based instrument
with a 57.6-Kbps serial connection; Windows-based user
interface; and real-time refresh of all curves and measurements
(2.5 frames per second).
The
Vector-SoC offers full coverage from 0 to more than 1
GHz in one band with 50-KHz resolution. It achieves a
gain/loss measurement from 5 to -35 dB with 0.25-dB resolution
(up to -45 dB from 0 to 300 MHz). In addition, the phase
measurement is from -90°C to 90°C with three degrees of
resolution. The Vector-SoC includes two VCOs. A receiver
module gets the reference signal from the generator as
well as the signal that went through the device being
tested. The third module is a simple prescaler used to
measure the actual frequency through the PSoC. Lastly,
the main module, which is built around the PSoC chip,
takes care of everything else, closing the loop between
the generator, receiver, prescaler, and host PC.
Robert
Lacoste
Chaville, France
robert_lacoste@yahoo.fr
Abstract
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