AD8346
CHARACTERIZATION SETUPS
SSB SETUP
Two main setups were used to characterize this product. These
setups are shown in Figure 33 and Figure 35. Figure 33 shows
the setup used to evaluate the product as an SSB. The AD8346
motherboard had circuitry that converted the single-ended
I and Q inputs from the arbitrary function generator to differ-
ential inputs with a dc bias of approximately 1.2 V. In addition,
the motherboard also provided connections for power supply
routing. The HP34970A and its associated plug-in 34901 were
used to monitor power supply currents and voltages being
supplied to the AD8346 evaluation board (a full schematic of
the AD8346 evaluation board can be found in Figure 30).
The two HP34907 plug-ins were used to provide additional
miscellaneous dc and control signals to the motherboard. The
LO was driven by an RF signal generator (through the balun on
the evaluation board to present a differential LO signal to the
device) and the output was measured with a spectrum analyzer.
With the I channel driven with a sine wave and the Q channel
driven with a cosine wave, the lower sideband is the single
sideband output. The typical SSB output spectrum is shown in
Figure 34.
IEEE
D1
HP34970A
D2
D3
34901 34907 34907
TEKAFG2020
D1
D2
D3
I
IN
IN
OUTPUT
OUTPUT
1
2
+15V MAX
COM
+25V MAX
–25V MAX
VPS1
IEEE
Q
AD8346
IEEE
MOTHERBOARD
ARB FUNC. GEN
VN
GND
VP
HP3631
P1
IN
IP
QP
QN
IP
QP
HP8593E
SWEEP OUT
28VOLT
IN
QN
AD8346
EVAL BOARD
HP8648C
LO
RFOUT
IEEE
VOUT
RF I/P
CAL OUT
ENBL
P1
IEEE
SPECTRUM
ANALYZER
IEEE
PC CONTROLLER
Figure 33. Evaluation Board SSB Test Setup
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
CENTER 1.9GHz
50kHz/
SPAN 500kHz
Figure 34. Typical SSB Output Spectrum
Rev. A | Page 16 of 20
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