4240 datasheet(5/8 Pages) PEREGRINE

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Product Specification

PE4240

Page 5 of 8

Document No. 70-0067-03

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Evaluation Kit

The SPST Switch Evaluation Kit board was

designed to ease customer evaluation of the

PE4240 SPST switch. The RF1 port is connected

through a 75

Ω transmission line to the top left

BNC connector, J1. The RF2 port is connected

through a 75

Ω transmission line to the BNC

connector on the top right side of the board, J2. A

through transmission line connects BNC

connectors J3 and J4. 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 model with

trace width of 0.021”, trace gaps of 0.030”,

dielectric thickness of 0.028”, metal thickness of

0.0021” and

εR of 4.3. Note that the predominate

mode for these transmission lines is coplanar

waveguide with a ground plane.

J5 provides a means for controlling DC and digital

inputs to the device. Starting from the lower left

pin, the second pin to the right (J5-3) is connected

to the device VDD input. The fourth pin to the right

(J5-7) is connected to the device CTRL input. 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.

Figure 11. Evaluation Board Layouts

Figure 12. Evaluation Board Schematic

Peregrine Specification 102/0081

Peregrine Specification 101/0079

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