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SAW Filters for Multifrequency, High-Accuracy GNSS
From Qualcomm

Qualcomm SAW Filters for Multifrequency, High-Accuracy GNSS

High-Precision Multifrequency GNSS ADAS

Advanced Driver Assistance Systems (ADAS) are designed to help the driver make decisions or, in the case of autonomous vehicles, take decisions on their own. Further, ADAS generates warning signals for critical events, such as collision avoidance, speed control, braking, blind spot detection and park assist.

ADAS is deployed in combination with high precision multifrequency GNSS, used to generate data required for precise location-based warnings (e.g. high speed warning in advance of a tight curve) and/or relevant driving commands.

An enabling component of these high precision GNSS modules are the RF filters. It is imperative that an appropriate filter is selected. The requirements for high precision ADAS/GNSS filters are:

  • The Group Delay Ripple (GDR) requirement is very strict. The target is around 5ns for the specific GNSS sub-bands in order to be able to achieve the precise positioning requirements → avoiding collisions
  • Low Insertion Attenuation (IA) and amplitude ripple for better sensitivity (low noise figure)
  • High Attenuation at the LTE bands to mitigate interferences disturbing the GNSS signal reception
  • The AEC-Q200 grade (G) requirement depends on the application (antenna or dashboard)
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Filter Types

Featured SAW Filters for Multifrequency, High-Accuracy GNSS

Part Number
Function
GNSS Bands
Frequency Range (MHz)
Insertion Loss (dB)
Package Size
Package Type
AEC-Q200 Grade
Notes
B39162B2621P810
Comb Filter
E5b+G3+L2+G2 L+L1+E1+G1+B1
1196-1249 1525-1606
2.7
3.1
1.5×1.1
CSSP
1
Low group delay
B39162B3436U410
Comb Filter
E5b+G3+L2+G2 L1+E1+G1+B1
1196-1250 1559-1606
2.5
2.7
3.0×3.0
SMD
1
Low group delay
B39162B4391P810
Diplexer
E5b+G3+L2+G2 L1+E1+G1+B1
1197-1249 1559-1606
1.3-1.5
1.0-1.3
1.5×1.1
CSSP
1
Pre-LNA, Optimized for IA, Low group delay
B39162B4388P810
Diplexer
E5b+G3+L2+G2 L1+E1+G1+B1
1197-1249 1559-1606
1.6-2.2
1.4-2.2
1.5×1.1
CSSP
1
Post-LNA, Optimized for high selectivity, Low group delay
B39162B3504U410
Comb Filter
L5+B2a+E5+G3 L1+E1+G1+B1
1164-1218 1559-1606
2.0
2.7
3.0×3.0
SMD
1
B39162B3505U410
Comb Filter
L5+B2a+E5+G3+L2+G2 L1+E1+G1+B1
1164-1250 1559-1606
2.4
2.8
3.0×3.0
SMD
1
Post-LNA, optimized for high selectivity, Low group delay
B39162B2651P810
Comb Filter
L5+B2a+E5+G3+L2+G2 L1+E1+G1+B1
1166-1254 1545-1610
0.9-1.1
1.8-2.0
1.5×1.1
CSSP
2
Pre-LNA, optimized for IA, Low group delay
B39162B3503U410
Comb Filter
L5+B2a+E5a L1+E1+G1+B1
1166.22-1186.68 1559-1607
1.6
1.9
3.0×3.0
SMD
1
Pre-LNA, optimized for IA, Low group delay
B39162B4394P810
Diplexer
L5+B2a+E5+G3+L2-G2 L1+E1+G1+B1
1164-1251 1559-1610
1.0-1.2 1.3-1.4
1.5×1.1
CSSP
2
Pre-LNA, Optimized for IA, Low group delay
B39162B4393P810
Diplexer
L5+B2a+E5+G3+L2-G2 L1+E1+G1+B1
1166-1251 1550-1607
1.3-1.6 1.5-1.6
1.5×1.1
CSSP
2
Post-LNA, Optimized for high selectivity, Low group delay
B39162B4392P810
Diplexer
L5+B2a+E5+G3 L1+E1+G1+B1
1166-1218 1559-1606
0.9-1.0
1.0
1.5×1.1
CSSP
1
Low IA and high selectivity, Low group delay

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