AN11420 NXP GPS LNA - GPS LNA voltage supply via a coax cable coming from the GPS receiver Application note
●Introduction
■GPS LNAs are needed in active antenna applications due to the losses of a long cable between the antenna and the receiver.
■This application note gives practical information how to supply an NXP GPS LNA via a coax cable coming from the GPS receiver. This applies to automotive qualified BGU7004 and BGU7008 since they both have the same architecture. They are AEC-Q100 qualified Low Noise Amplifiers (LNAs) for GPS receiver applications in a plastic leadless 6-pin, extremely small SOT886 package. Both of them require only one external matching inductor and one external decoupling capacitor. They adapt itself to the changing environment resulting from co-habitation of different radio systems in modern cellular handsets. During high jamming power levels, resulting for example from a cellular transmit burst, it temporarily increases its bias current to improve sensitivity. Both of them cover full GNSS L1 band, from 1559 MHz to 1610 MHz and work with a supply voltagefrom 1.5 V to 2.85 V.
■The BGU7004 and BGU7008 performance information is available in their datasheets.
●System features
■AEC-Q100 qualified
■Covers full GNSS L1 band, from 1559 MHz to 1610 MHz
■Noise figure = 0.85 dB for BGU7008 and 0.9 dB for BGU7004
■Gain 18.5 dB for BGU7008 and 16.5 dB for BGU7004
■High 1 dB compression point of −12 dBm for BGU7008 and -11 dBm for BGU7004
■High out of band IP3i of 4 dBm for BGU7008 and 9 dBm for BGU7004
■Supply voltage 1.5 V to 2.85 V, optimized for 1.8 V
■Power down mode current consumption < 1 uA
■Optimized performance at low supply current of 4.8 mA for BGU7008 and 4.5 mA for BGU7004.
■Integrated temperature stabilized bias for easy design；
■Requires only one input matching inductor and one supply decoupling capacitor
■Input and output DC decoupled
■ESD protection on all pins (HBM > 2 kV)
■Integrated matching for the output
■Small 6-pin leadless package 1 mm × 1.45 mm × 0.5 mm
■110 GHz transit frequency - SiGe:C technology
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Application note & Design Guide |
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Please see the document for details |
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SOT886 |
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English Chinese Chinese and English Japanese |
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4 October 2013 |
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Rev. 1 |
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AN11420 |
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410 KB |
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