Trace; Ground Segmentation - Locosys MC-1010 Hardware Design Manual

3.3

Trace

(1). The USB differential signals should be trace close and equal-length for minimum radiation
and noise immunity.
(2). Please have the RF traces had the character impendence of 50 ohm for good impedance
matching.
(3). Any right angle turn in trace routing should be accomplished with two 135 degree turn or
an arc turn
It is better to have independent trace of power source for any device
3.4

Ground Segmentation

The separation of ground between GPS module and the rest of the system is recommended to
avoid system interference. If this is not possible, it is best to follow these typical rules:
segmentation of ground between digital and analogue system, high current and low current
system, and different radiation systems in general (such as GPS and GPRS).
One way to segment the ground is to place digital and noise component at one corner of the
board, while placing analog and quiet components at the opposite corner of the board. Make
sure there is no crossing of microstrip or current between the two component sets and grounds
of each sets are contacted in one point only.
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