Quick Start Procedure - Linear Technology DC2566A Demo Manual

notes on test equipMent setup
• High performance signal generators with low harmonic
outputs should be used for 2-tone measurements. Oth-
erwise, low-pass filters at the signal generator outputs
should be used to suppress harmonics.
• High quality combiners should be used to present a
broadband 50Ω termination on all ports as well as
provide good port-to-port isolation. Adding attenuator
pads further improves source isolation and helps prevent
the signal generators from producing intermodulation
products.

quick stArt proceDure

1. Connect all test equipment as shown in Figure 2.
2. Set the power supply output voltage to 3.3V and set
the current limit to 200mA.
3. Connect the ground and V
be sUre TO CONNeCT The v
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CC
4. Connect the EN turret to the power supply.
turrets to the power supply.
CC
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CC
DEMO MANUAL DC2566A
• Spectrum analyzers can produce significant internal
distortion products if they are overdriven. Generally,
spectrum analyzers are designed to operate at their
best with about –30dBm to –40dBm at their input. The
spectrum analyzer's input attenuation setting should be
used to avoid saturating the instrument.
• Set the spectrum analyzer's input attenuation depending
on the spectrum analyzer used.
• Before performing measurements on the DUT, the sys-
tem performance should be evaluated to ensure that
a clean input signal is obtained and that the spectrum
analyzer's internal distortion is minimized.
5. Set the LO signal generator to provide a 7910MHz CW
signal at about 0dBm to the demo board's LO port.
6. Set the RF signal generators to provide one 9799MHz
CW signal and one 9801MHz CW signal. The signals
should be applied to the 2-way combiner. The output
of the combiner should be applied to the demo board's
RF input port. The two tones should be set to 5dBm
each at the mixer's RF input port.
7. Set the spectrum analyzer's center frequency to
1890MHz.
8. Perform various measurements (Conversion Gain,
OIP3, LO leakage, etc.).
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