AN11915 BGU8309 [GPS1401M] tuned for GNSS L2 evaluation board Application note
●Introduction
■NXP Semiconductors BGU8309, also called GPS1401M,Global Navigation Satellite System (GNSS)LNA Evaluation Board(see Fig 1)is designed to evaluate the performance of the GNSS LNA using:
▲NXP Semiconductors GPS1401M GNSS Low Noise Amplifier
▲Matching inductor at the input
▲A decoupling capacitor at the power supply connection
■NXP Semiconductors GPS1401M is a low-noise amplifier for GNSS receiver applications in a plastic, leadless 6 pin, extremely thin small outline SOT1226-2 at 0.8 x 0.8 x 0.35mm. The GPS1401M features gain of 17dB and a noise figure of 0.65 dB at a current consumption of 3.6 mA. Its superior linearity performance removes interference and noise from co-habitation cellular transmitters, while retaining sensitivity. The LNA components occupy a total area of approximately 2.3 mm2.
■The GPS1401M used on this evaluation board is originally designed to use as a GNSS L1-band LNA. It contains internally matched circuitry for this frequency band (1559 MHz to 1610 MHz) whereas only one series inductor at the input is needed to achieve the best RF performance.
■By increasing the value of the input matching coil, the operating frequency range can be tuned to the GNSS L2-band (1215 MHz to 1254 MHz).
■In this document, the application diagram, board layout, bill of materials, and typical results are given.
●General description
■Modern cellular phones have multiple radio systems, so problems like co-habitation are quite common. A GNSS receiver implemented in a mobile phone requires the following factors to be taken into account.
■All the different transmit signals that are active in smartphones and tablets can cause problems like inter-modulation and compression.
■Since the GNSS receiver needs to receive signals with an average power level of -130 dBm, sensitivity is very important. Currently there are several GNSS chipsets on the market that can be implemented in cell phones, tabletsetc. Although many of these GNSS ICs do have integrated LNA front ends, the noise performance, and as a result the system sensitivity,is not always adequate. The GNSS receiver sensitivity is a measure how accurate the coordinates are calculated. The GNSS signal reception can be improved by a so called GNSS LNA, which improves the sensitivity by amplifying the wanted GNSS signal with a low-noise amplifier.
■Next picture (Fig 2) depicts a part of the frequency spectrum that is occupied by the different GNSS frequency bands.
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GNSS L2-band evaluation board 、 Global Navigation Satellite System (GNSS)LNA Evaluation Board |
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[ GNSS LNA ] |
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Application note & Design Guide |
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Please see the document for details |
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SOT1226-2 |
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English Chinese Chinese and English Japanese |
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17 July 2017 |
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Rev. 1 |
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AN11915 |
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1.1 MB |
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