Network Analyzer Calibration Procedure - Analog Devices EVAL-ADGM1144SDZ User Manual

User Guide

NETWORK ANALYZER CALIBRATION PROCEDURE

Use the following procedure in conjunction with the EVAL-
ADGM1144SDZ for two-port measurements, assuming the user has
a set of manual calibration standards or an electric calibration type
unit to perform a short load open through (SLOT) calibration of the
network analyzer. The maximum value for the network analyzer fre-
quency sweep for the EVAL-ADGM1144SDZ PCB can be up to 20
GHz. Perform the following steps for the two-port measurements:
1. Perform a full, two-port standard SLOT calibration of the net-
work analyzer.
2. Connect the calibration thru calibration line (Connector RFC1
and Connector RFC2) to the analyzer and measure its insertion
loss, S(2,1).
3. Save the measured data to the network analyzer memory for
later use.
4. Configure the EVAL-ADGM1144SDZ links and power up the
EVAL-ADGM1144SDZ with a 3.3 V DC power supply.
5. Connect the network analyzer to the desired MEMS switch RF
connectors and apply the external control signals, if needed.
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EVAL-ADGM1144
6. Measure the complete insertion loss of the EVAL-
ADGM1144SDZ. Include the insertion loss of the MEMS switch
and test fixture (PCB transmission lines and RF connectors).
7. De-embed the PCB losses from the complete evaluation board
measurement using the data saved at Step 3 and the measured
data at Step 6. Because the extraction method is dependent on
the network analyzer, consult the network analyzer user manual
before performing the extraction. Typically, the divide function
divides the complete S(2,1) insertion loss measurement data
by the calibration thru line S(2,1) insertion loss data stored in
memory.
8. Use the network analyzer port extension function to de-embed
the phase offset introduced by the PCB transmission lines. The
port extension method uses time delay offset values to correct
for phase. Enter the time delay values into the port extension
menu on the network analyzer for each RF edged connector
to switch the pin path equal to the electrical length of the
calibration line divided by two.
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