User's Manual
PCS3_HD_v01.000-03
Confidential / Preliminary
Page 53 of 101
2013-10-21
PCS3 Hardware Interface Description
5.1 CDMA Antenna Interface
5.1.1
Antenna Installation
The antenna is connected by soldering the antenna pads and their neighboring ground pads
directly to the application’s PCB.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
P
BATT
N
BATT
M
L
GND
K
ANT
CDMA
J
GND
H
G
nc
F
GND
E
nc
D
GND
nc
C
B
BATT+
_
CDMA
A
BATT+
_
CDMA
nc
GND
nc
GND
Figure 25: Antenna pads
The distance between the antenna pads and their neighboring GND pads has been optimized
for best possible impedance. To prevent mismatch, special attention should be paid to these
pads on the application’ PCB.
The wiring of the antenna connection, starting from the antenna pad to the application’s anten-
na should result in a 50 line impedance. Line width and distance to the GND plane need
to
be optimized with regard to the PCB’s layer stack. Some examples are given in Section
5.1.2.
To prevent receiver desensitization due to interferences generated by fast transients like high
speed clocks on the external application PCB, it is recommended to realize the antenna con-
nection line using embedded Stripline rather than Micro-Stripline technology. Please see Sec-
tion 5.1.2 for examples of how to design the antenna connection in order to achieve the
required 50 line impedance.
For type approval purposes, the use of a 50 coaxial antenna connector (U.FL-R-SMT) might
be necessary. In this case the U.FL-R-SMT connector should be placed as close as possible
to PCS3‘s antenna pad.