Test Procedure; Biasing Sequence - Analog Devices EVAL-ADRF5347 User Manual

User Guide

TEST PROCEDURE

BIASING SEQUENCE

To bias up the ADRF5347-EVALZ, perform the following steps:
1. Ground the GND test point.
2. Bias up the V test point.
DD
3. Bias up the V test point.
SS
4. Bias up the V1, V2, and LS test points.
5. Apply an RF input signal.
The ADRF5347-EVALZ is shipped fully assembled and tested.
Figure 4 provides a basic test setup diagram to evaluate the s-pa-
rameters using a network analyzer. Perform the following steps to
complete the test setup and verify the operation of the ADRF5347-
EVALZ:
1. Connect the GND test point to the ground terminal of the power
supply.
2. Connect the V test point to the voltage output terminal of the
DD
5 V supply and the V test point to the voltage output terminal
SS
of the −3.4 V supply. Note that the current must be 2.4 mA and
0.4 mA, respectively.
3. Connect the V1, V2, and LS test points to the voltage output
terminal of the 3.3 V supply. The ADRF5347 can be configured
in different modes by connecting the control test points to 3.3 V
or 0 V, as shown in Table 3.
4. Connect a calibrated network analyzer to the RFC, RF1, RF2,
RF3, and RF4 SMA connectors. If network analyzer port count
is not enough, terminate unused RF ports with 50 Ω. Sweep the
frequency from 10 MHz to 4 GHz and set the power to –5 dBm.
5. The ADRF5347-EVALZ is expected to have an insertion loss of
0.42 dB at 3.8 GHz. See the expected results in
Additional test equipment is needed to fully evaluate the device
functions and performance.
For third-order intercept point evaluation, use two signal generators
and a spectrum analyzer. A high isolation power combiner is also
recommended.
Table 3. Control Voltage Truth Table
Digital Control Inputs
LS V1 V2
Low Low Low
Low High Low
Low Low High
Low High High
High Low Low
High High Low
High Low High
High High High
analog.com
Figure 5.
RF1 to RFC RF2 to RFC
Insertion loss (on) Isolation (off)
Isolation (off) Insertion loss (on)
Isolation (off) Isolation (off)
Isolation (off) Isolation (off)
Isolation (off) Isolation (off)
Isolation (off) Isolation (off)
Isolation (off) Insertion loss (on)
Insertion loss (on) Isolation (off)
EVAL-ADRF5347
For power compression and power handling evaluations, use a 2-
channel power meter and a signal generator. A high enough power
amplifier is also recommended at the input. Test accessories, such
as couplers and attenuators, must have enough power handling.
The ADRF5347-EVALZ comes with a support plate attached to the
bottom side. To ensure maximum heat dissipation and to reduce
thermal rise on the board during high power evaluations, this
support plate must be attached to a heat sink using thermal grease.
Note that the measurements performed at the SMA connectors of
the ADRF5347-EVALZ include the losses of the SMA connectors
and the PCB. The thru line must be measured to calibrate out the
effects on the ADRF5347-EVALZ. The thru line is the summation of
an RF input line and an RF output line connected to the device and
equal in length.
Figure 4. Test Setup Diagram
RFx Paths
RF3 to RFC
Isolation (off)
Isolation (off)
Insertion loss (on)
Isolation (off)
Isolation (off)
Insertion loss (on)
Isolation (off)
Isolation (off)
RF4 to RFC
Isolation (off)
Isolation (off)
Isolation (off)
Insertion loss (on)
Insertion loss (on)
Isolation (off)
Isolation (off)
Isolation (off)
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