MAMUSM0008 Datasheet, PDF (6/6 Pages) Tyco Electronics – Digital Switched Delay Line, 1.8 - 2.4 GHz

MAMUSM0008
Digital Switched Delay Line
1.8 - 2.4 GHz
Measurement
The simplest way to measure the delay steps is
with a vector network analyzer (VNA). For taking
S-Parameter data, perform a standard calibration
and measure the parameters for the given state.
Below is a description of how to see the delay
accurately. M/A-COM recommends the following
measurement procedure:
Set the delay line to the reference or insertion
delay state. With the two ports of the VNA
connected to the “in” and “out” on the test board,
measuring S21, set displayÆ memory, and display
data/memory. This will normalize your data to the
reference insertion state.
Next, switch the measurement format to phase.
This should be flat and zero due to the
normalization. Switch in the first delay line. (50ps).
The display will not remain on zero, but will have
an offset. Under the Scale/Reference menu, select
electrical delay, and dial that up until the data reads
zero again, across the band of interest. That
electrical delay will be 50ps.
Continue to switch in the delay lines, dialing in
more delay each time.
Other methods are possible, but this is the most
straightforward approach. We do not recommend
using the ‘delay’ format in the VNA. The VNA’s
method of measuring this results in a noisy
response, and is less accurate than the method
outlined above.
Upon request, M/A-COM can provide a test control
board to ease stepping through the states.
Rev. V3
6
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