Datasheet

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%
RELATIVE DIELECTRIC CONSTANT (H
r

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 R
F
radiation. A better way to route the power traces can be seen in the following
setup. (see Figure 51)
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