I
-
Measuring
Conversion
Loss
Conversion loss is the ratio of IF output power to RF input power expressed
in
dB.
This section uses an example measurement to describe how to measure
the conversion loss of a broadband mixer.
When characterizing a device’s conversion loss, the analyzer uses broadband
detection to compare the transmitted signal (B*) to the reference signal
(R*). This is because the input and output signals of a frequency-translating
device may be different. Since broadband detection measures signals at all
frequencies, you may want to use a
Iilter
to remove unwanted signals such as
LO feedthrough when performing this measurement.
For example, an RF signal at 900 MHz mixed with an LO signal at 200 MHz,
results in mixing product signals at 700 MHz and 1100 MHz, as well as the
original 900 MHz and 200 MHz RF and LO signals.
3-35
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