Quick Start Procedure - Linear Technology DC2461A Manual

notes on test eQuipMent AnD setup
• High performance signal generators with low harmonic
outputs should be used for 2-tone measurements.
Otherwise, 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 at-
tenuator 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
ply. BE SURE TO CONNECT THE V
THE EN TURRET TO ENSURE THAT THE PART DOES
NOT GET DAMAGED. ALSO, REMOVE POWER FROM
EN TURRET BEFORE REMOVING POWER FROM THE
V TURRET.
CC
4. Connect the EN turret to the power supply.
5. Set the LO signal generator to provide a 5560MHz CW
signal at about 0dBm to the demo board's LO port.
turrets to the power sup-
CC
TURRET BEFORE
CC
DEMO MANUAL DC2461A
• 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 depend-
ing on the spectrum analyzer used.
• Before performing measurements on the DUT, the
system performance should be evaluated to ensure that
a clean input signal is obtained and that the spectrum
analyzer's internal distortion is minimized.
6. Set the RF signal generators to provide one 5799MHz
CW signal and one 5801MHz 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 240MHz
with a span of 10MHz.
8. Perform various measurements
(Conversion Gain, OIP3, LO leakage, etc.)
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