In Electronic Infomation Category: 4 | on September 30,2011
Ground when the layout of the first consideration is the "subdivision" that, according to the different supply voltage, digital and
42 datasheet and analog circuits were set up ground. In the multi-layer printed circuit board has a dedicated ground floor, on the ground floor with a "designated ditch" approach to subdivision. However, the subdivision is not completely isolated from the various places, but still need to put in place various short to ground up to ensure the continuity of the electrical ground, short-channel image is sometimes referred to as "bridge . " Bridge should have enough width.
layout ground should note the following:
(1) multilayer high-speed signal on the signal layer trajectory can not cross the ditch on the ground floor.
(2) A / D converter chip, such as only one ground pin, the chip should be placed in the analog and
42 price and digital connection to the bridge, the digital signal back around the ditch to avoid the line.
(3) connectors do not cross-Pei in the ditch on the ground, because the ditch on both sides of the ground may vary greatly, and
42 suppliers and thus through the external cable common-mode radiation harassment.
(4) double-sided ground usually well-shaped mesh structure that is arranged into a comb-shaped structure on the one hand the ground; the other hand, perpendicular to the ground a few arrangements, used at the intersection hole connection. Network structure can reduce the signal current loop area. Ground should be as rough, to reduce the inductance to online distribution.
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