Keysight Technologies PD1000A, Operating Manual

Page: 34 / 44

34 Keysight PD1000A Test Fixture Operating Guide
Customizing an SMD Test Fixture
Create New Calibration Standards
Along with the customized microstrip line PC Board and Frame Guide, you will
need to create seven new Calibration Standards. These Cal Standards are small
microstrip line PC boards with Open, Short, and Through; two boards have 50
Ω
SMD resistors. The dimensions of the seven new Cal Standards must be the
same as the outside dimensions of your DUT; the thickness of the Cal Standard
must be the same thickness as your DUT. The seven PC boards must be designed
as follows (use the provided TO-263-7 Cal Standards as examples):
Cal Standard Connection Requirements
Port 1 Open No connection, Gate to Source/Emitter.
Port 1 Short Direct connection, Gate to Source/Emitter.
Port 1 50
Ω
Load Gate to Source/Emitter. Use a 50
Ω
SMD resistor
.
The resistor must go on
the top side of the PC board, not the trace side. See Figure 21 below.
Port 2 Open No connection, Drain/Collector to Source/Emitter.
Port 2 Short Direct connection, Drain/Collector to Source/Emitter.
Port 2 50 Ω Load Drain/Collector to Source/Emitter. Use a 50 Ω SMD resistor . The resistor
must go on the top side of the PC board, not the trace side. See Figure 21.
Through Gate to Drain/Collector.
Figure 21 Constructing the two 50
Ω
SMD Cal Standards
Example Calibration Standards for the
“Gate to Source/Emitter” and the
“Drain/Collector to Source Emitter”. The
traces on the bottom of the PC Board
must match the pin-out of the DUT. The
0 Ω SMD resistor (short) or 50 Ω SMD
resistor must be placed on the top of the
PC Board.
Gat
e to
Sou
rce
/Em
itte
r
Dra
in/C
olle
cto
r
to
Sou
rce
/Em
itte
r
Top view of
PC board
Bottom view
of PC board
0
Ω
(short) or
50
Ω
SMD
Resistor
Pin 1
Gate