5
dc2035af
DEMO MANUAL DC2035A
a. Measure The wanted two-tone IF output signals are
located at:
Low Side LO:
f
IF1
= f
RF1
– f
LO
,
f
IF2
= f
RF2
– f
LO
High Side LO:
f
IF1
= f
LO
– f
RF1
,
f
IF2
= f
LO
– f
RF2
b.The 3rd order intermodulation products which are closest
to the wanted IF signals are used to calculate the input
3rd order intercept, where ∆IF = f
IF2
– f
IF1
:
f
IM3,1
= f
IF1
– ∆IF
f
IM3,2
= f
IF2
+ ∆IF
b. Calculate the input 3rd order intercept:
IIP3 = (∆
IM3
)/2 + P
RF
Where ∆
IM3
= P
IF
– P
IM3
6. Turn off one of the RF signal generators, and measure
conversion gain, RF to IF isolation, LO to IF leakage,
and input 1dB compression point.
Noise Figure Measurements
1. Configure and calibrate the noise figure meter for mixer
measurements.
2. Connect all test equipment as shown in Figure 3 with
signal generator and DC power supply turned off.
3. Increase VCC supply voltage to 3.3V, and verify that the
current consumption is approximately 204mA with LO
signal applied. The supply voltage should be confirmed
at the demo board VCC and GND terminals to account
for voltage drop across supply leads.
4. Set LO source to provide a 0dBm, CW signal to the
demo board LO input port at appropriate LO frequency.
5. Measure the single-sideband noise figure.
QUICK START PROCEDURE
Figure 1. Proper Equipment Setup for Return Loss Measurements
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