SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11
Design-in
Page 73 of 157
C5
GND plane
VCC line
Cap acit or wit h
SRF ~9 0 0 M Hz
C1
C3 C4
FB1
Ferrit e Bead
f or GHz n oise
C2
C1
GND
C2
C4
SARA-R4/ N4
5 2
VCC
53
VCC
5 1
VCC
3V8
C5
+
FB1
C3
Cap acit or wit h
SRF ~19 0 0 M Hz
SARA
Figure 27: Suggested design to reduce ripple / noise on VCC, highly recommended when using an integrated antenna
Reference
Description
Part Number - Manufacturer
C1
68 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H680JA01 - Murata
C2
15 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H150JA01 - Murata
C3
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
C4
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C104KA01 - Murata
C5
100
µ
F Capacitor Tantalum B_SIZE 20% 6.3V 15m
T520B107M006ATE015 – Kemet
10
µ
F Capacitor Ceramic X5R 0603 20% 6.3 V
GRM188R60J106ME47 - Murata
FB1
Chip Ferrite Bead EMI Filter for GHz Band Noise
220
at 100 MHz, 260
at 1 GHz, 2000 mA
BLM18EG221SN1 - Murata
Table 19: Suggested components to reduce ripple / noise on VCC
☞
The necessity of each part depends on the specific design, but it is recommended to provide all the
parts described in
if the application device integrates an internal antenna.
☞
ESD sensitivity rating of the
VCC
supply pins is 1 kV (HBM according to JESD22-A114). Higher protection
level can be required if the line is externally accessible on the application board, e.g. if accessible battery
connector is directly connected to the supply pins. Higher protection level can be achieved by mounting
an ESD protection (e.g. EPCOS CA05P4S14THSG varistor) close to accessible point.
2.2.1.11
Guidelines for VCC supply layout design
Good connection of the module
VCC
pins with DC supply source is required for correct RF performance.
Guidelines are summarized in the following list:
All the available
VCC
pins must be connected to the DC source
VCC
connection must be as wide as possible and as short as possible
Any series component with Equivalent Series Resistance (ESR) greater than few milliohms must be
avoided
VCC
connection must be routed through a PCB area separated from RF lines / parts, sensitive analog
signals and sensitive functional units: it is good practice to interpose at least one layer of PCB ground
between the
VCC
track and other signal routing
