V

+

GND

1M

10M

100M

1G

10G

FREQUENCY (Hz)

3.5

3.6

3.7

3.8

3.9

4.5

4.6

4.7

4.8

4.9

5.0

4.4

4.3

4.2

4.1

4.0

RESIN = 40%

RESIN = 45%

RESIN = 55%

RESIN = 60%

RESIN = 50%

LMH6559

SNOSA57C – APRIL 2003 – REVISED MARCH 2013

www.ti.com

Figure 49.

Routing Power Traces

Power line traces routed over a pcb should be kept together for best practice. If not a ground loop will occur

which may cause more sensitivity to radiation. Also additional ground trace length may lead to more ringing on

digital signals. Careful attention to power line distribution leads to improved overall circuit performance. This is

especially valid for analog circuits which are more sensitive to spurious noise and other unwanted signals.

Figure 50.

As demonstrated in Figure 50 the power lines are routed from both sides on the pcb. In this case a current loop

is created as indicated by the dotted line. This loop can act as an antenna for high frequency signals which

makes the circuit sensitive to RF radiation. A better way to route the power traces can be seen in the following

setup. (see Figure 51)

24

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