QSMP

QFN Style Computer On Module

Advantages

Defined Return Path

The reason PCB layout becomes more and more important is

because of the trend to faster, higher integrated, smaller

formfactors, and lower power electronic circuits. The higher

the switching frequencies are, the more radiation may occur

on a PCB. With good layout, many EMI problems can be

minimized to meet the required specifications.

When a module or component is used in a design, the

supplier specifies the basis for such a layout. It‘s not only

the pinout which should lead to an easy wiring without the

need for crossings. He has also provide a proper solution for

the signal path back to the module. If this return path,

mostly the ground plane, cannot be connected near the

signal pin, the return current has to take another way and

this may result in a loop area. The larger the area, the more

radiation and EMI problems may occur.

Ka-Ro QSCOM modules uses a large ground pad on the

bottom side. With this a defined ground plane connection is

available for all signals. In addition to have a good return

path for all signals this large ground pad can be used for

cooling.

Easy Wiring - Even 2-layer printed circuit

boards can be used.

With a solid ground plane on the bottom layer, high speed

signals can be routed on the top layer at a defined

impedance. However, this is only possible if a peripheral or

plug can be connected directly without crossing the routing.

Advanced Soldering

Using a large solder pad underneath the component has not

only electrical and thermal advantages. This is also used to

hold the component at a defined height during soldering,

without the solder being compressed by the weight, which

could result in short circuits.

Standard Contact Assignments

Ka-Ro electronics GmbH - Pascalstr. 22, D-52076 Aachen, Germany - Tel.: +49 2408 1402-0 (FAX -10)

www.karo-electronics.de