ADL5380-29A-EVALZ AD [Analog Devices], ADL5380-29A-EVALZ Datasheet - Page 30

• Manufacturer Part Number: ADL5380-29A-EVALZ
• Description: 400 MHz to 6 GHz Quadrature Demodulator
• Manufacturer: AD [Analog Devices]

ADL5380
CHARACTERIZATION SETUPS
Figure 95 to Figure 97 show the general characterization bench
setups used extensively for the ADL5380. The setup shown in
Figure 97 was used to do the bulk of the testing and used sinusoidal
signals on both the LO and RF inputs. An automated Agilent
VEE program was used to control the equipment over the
IEEE bus. This setup was used to measure gain, IP1dB, IIP2,
IIP3, I/Q gain match, and quadrature error. The ADL5380
characterization board had a 9-to-1 impedance transformer on
each of the differential baseband ports to do the differential-to-
single-ended conversion, which presented a 450 Ω differential load
to each baseband port, when interfaced with 50 Ω test equipment.
For all measurements of the ADL5380, the loss of the RF input
balun was de-embedded. Due to the wideband nature of the
ADL5380, three different board configurations had to be used to
characterize the product. For low band characterization (400 MHz
to 3 GHz), the Mini-Circuits TC1-1-13 balun was used on the
RF and LO inputs to create differential signals at the device pins.
For midband characterization (3 GHz to 4 GHz), the Johanson
Technology 3600BL14M050T was used, and for high band
characterization (5 GHz to 6 GHz), the Johanson Technology
5400BL15B050E balun was used.
SIGNAL GENERATOR
POWER SUPPLY
AGILENT 8665B
HP 6235A
GND
V
POS
Figure 95. General Noise Figure Measurement Setup
CHAR BOARD
ADL5380
RF
LO
SNS
OUTPUT
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CONTROL
Q
I
IEEE
50Ω
R1
LOW-PASS
The two setups shown in Figure 95 and Figure 96 were used
for making NF measurements. Figure 95 shows the setup for
measuring NF with no blocker signal applied while Figure 96
was used to measure NF in the presence of a blocker. For both
setups, the noise was measured at a baseband frequency of
10 MHz. For the case where a blocker was applied, the output
blocker was at a 15 MHz baseband frequency. Note that great
care must be taken when measuring NF in the presence of a
blocker. The RF blocker generator must be filtered to prevent
its noise (which increases with increasing generator output power)
from swamping the noise contribution of the ADL5380. At least
30 dB of attention at the RF and image frequencies is desired.
For example, assume a 915 MHz signal applied to the LO inputs of
the ADL5380. To obtain a 15 MHz output blocker signal, the RF
blocker generator is set to 930 MHz and the filters tuned such
that there is at least 30 dB of attenuation from the generator at
both the desired RF frequency (925 MHz) and the image RF
frequency (905 MHz). Finally, the blocker must be removed
from the output (by the 10 MHz low-pass filter) to prevent
the blocker from swamping the analyzer.
FILTER
NOISE FIGURE ANALYZER
AGILENT N8974A
INPUT
PC CONTROLLER