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12 Elizabeth Drive, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

Web Site: www.hittite.com

MICROWAVE CORPORATION

2

HMC173MS8 VOLTAGE VARIABLE ATTENUATOR 800-2000 MHz

The circuit board used in the final application should use RF circuit design techniques. Signal lines should have

50 ohm impedance while the package ground leads should be connected directly to the ground plane similar to

that shown below. A sufficient number of VIA holes should be used to connect the top and bottom ground planes.

The evaluation circuit board as shown is available from Hittite upon request.

Evaluation Circuit Board

Evaluation Circuit Board Layout Design Details

Layout Technique

Grounded Co-Planar Waveguide (GCPW)

Material

FR4

Dielectric Thickness

0.028" (0.71 mm)

50 Ohm Line Width

0.037" (0.94 mm)

Gap to Ground Edge

0.010" (0.25 mm)

Ground VIA Hole Diameter

0.014" (0.36 mm)

Connectors

SMA-F ( EF - Johnson P/N 142-0701-806)

HMC173MS8