dresden elektronik ingenieurtechnik gmbh MEGA22M00 사용자 설명서
User Manual
Version 1.1c
2013-07-01
Version 1.1c
2013-07-01
OEM
radio modules deRFmega
www.dresden-elektronik.de
Page 38 of 52
8.4.
Layers
The use of 2 or 4 layer boards have advantages and disadvantages for the design of a
custom base board.
custom base board.
Table 8-1: 2 and 4 layer board properties in comparison
2 Layer board
4 Layer board
(-) only 2 layers available for routing the traces
and design a proper ground area
and design a proper ground area
(+) 4 layers available for routing the traces
and design a proper ground area
and design a proper ground area
(-) only 1 layer available for routing the traces
under the module
under the module
(+) 3 layers available for routing the traces
under the module
under the module
(-) no separate VCC plane usable
(+) separate VCC plane usable
(+) cheaper than 4 layers
(-) more expensive than 2 layers
Top
Bottom
Mid 1
Mid 2
2 Layer
4 Layer
Module
4 Layer
Traces under
module:
module:
Not allowed
allowed
allowed
allowed
Traces under
module:
Not allowed
allowed
Figure 29: Layer design of 2 and 4 layer boards