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PE4237
Product Specification
Evaluation Kit
The SPDT Switch Evaluation Kit board was
designed to ease customer evaluation of the
PE4237 SPDT switch. The RF common port is
connected through a 50 ? transmission line to the
top left SMA connector, J1. Port 1 and Port 2 are
connected through 50 ? transmission lines to the top
two SMA connectors on the right side of the board,
J2 and J3. A through transmission line connects
SMA connectors J4 and J5. This transmission line
can be used to estimate the loss of the PCB over the
environmental conditions being evaluated.
The board is constructed of a two metal layer FR4
material with a total thickness of 0.031”. The bottom
layer provides ground for the RF transmission lines.
The transmission lines were designed using a
coplanar waveguide with ground plane model using
a trace width of 0.0476”, trace gaps of 0.030”,
dielectric thickness of 0.028”, metal thickness of
0.0021” and ε r of 4.4.
J6 provides a means for controlling DC and digital
inputs to the device. Starting from the lower left pin,
the second pin to the right (J6-3) is connected to the
device CNTL input. The fourth pin to the right (J6-7)
is connected to the device V DD input. A decoupling
capacitor (100 pF) is provided on both CTRL and
V DD traces. It is the responsibility of the customer to
determine proper supply decoupling for their design
application. Removing these components from the
evaluation board has not been shown to degrade RF
performance.
Document No. 70-0071-06 │ www.psemi.com
Figure 12. Evaluation Board Layouts
Peregrine Specification 101/0085
Figure 13. Evaluation Board Schematic
Peregrine Specification 102/0110
?2003-2009 Peregrine Semiconductor Corp. All rights reserved.
Page 5 of 8
Peregrine products are protected under one or more of the following U.S. Patents: http://patents.psemi.com
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