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)
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 |
