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NXP Semiconductors

UM10497

BGU8007 GPS LNA EVB

UM10497

All information provided in this document is subject to legal disclaimers.

User manual

Rev. 1.0 — 5 October 2011

11 of 16

(Pin 1575 MHZ = -45 dBm)

Fig 9. Icc versus jammer power at 1850 MHz

Fig 10. Gain versus jammer power at 1850 MHz

7. Noise figure as function of jammer power at 850 MHz and 1850 MHz

Noise figure under jamming conditions is a measure of how the LNA behaves when e.g.

a GSM TX interfering signal is at the input of the GPS antenna. To measure this behavior

the setup shown in

Fig 11

is used.

The jammer signal is coupled via a directional coupler to the DUT: this is to avoid the

jammer signal damaging the noise source. The GPS BPF is needed to avoid driving the

second-stage LNA in saturation.
For the Jammer-Generator a low Phase-Noise type is advised. This is to avoid extra

noise caused by the Jammer-Generator at measurement frequency (1575 MHz).

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Содержание BGU8007 GPS LNA EVB

Страница 1: ...007 GPS LNA evaluation board Rev 1 0 5 October 2011 User manual Document information Info Content Keywords LNA GPS BGU8007 Abstract This document explains the BGU8007 GPS low noise amplifier evaluation board Downloaded from Arrow com ...

Страница 2: ...V 2011 All rights reserved User manual Rev 1 0 5 October 2011 2 of 16 Contact information For additional information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Revision history Rev Date Description 1 0 20111005 First Release Downloaded from Arrow com Downloaded from Arrow com ...

Страница 3: ...ly requires two external components one series inductor for input matching and one decoupling capacitor The BGU8007 contains one RF stage and internal bias that is temperature stabilized It is also supplied with an enable function allowing it to be controlled by a logic signal The BGU8007 is ideal for use as GNSS LNA in smart phones feature phones and Portable Navigation Devices The GPS LNA evalua...

Страница 4: ... are AC coupled via an integrated capacitor Only two external components are required to build a GPS LNA with the following advantages Low noise High gain High linearity under jamming Very low package height 0 5mm Low current consumption Short power settling time The data sheet of the BGU8007 is available and it is called SiGe C Low Noise Amplifier MMIC for GPS GLONASS and Galileo 3 Application Bo...

Страница 5: ...n Circuit The circuit diagram of the evaluation board is shown in Fig 2 With jumper JU1 the enable pin can be controlled to either to Vcc or GND Fig 2 Circuit diagram of the BGU8007 evaluation board 3 2 Board Layout Fig 3 Printed circuit board lay out of the BGU8007 GPS LNA evaluation board Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Down...

Страница 6: ... of the BGU8007 GPS LNA EVB v2 1 Designator Description Footprint Value Supplier Name type Comment Ac BGU8007 1 45x1 0mm LNA MMIC PCB v2 1 35x20mm BGU8007 GPS LNA EVB C1 Capacitor 0402 1nF Murata GRM1555 Decoupling L1 Inductor 0402 5 6nH Murata LQW15A High Q low Rs Input matching X1 X2 SMA RF connector Johnson End launch SMA 142 0701 841 RF input RF output X3 DC header Molex PCB header Right Angle...

Страница 7: ...er exceed 2 5 V as it might damage the BGU8007 3 Jumper JU1 is connected between the Vcc terminal of the evaluation board and the Ven pin of the BGU8007 Fig 5 shows the evaluation board including its connections 4 To evaluate the power on settling time ton and the power off settling time toff it is also possible to use a separate voltage on the Ven eventually this voltage can be supplied by a puls...

Страница 8: ... the following is needed A 5dB ENR noise source a directional coupler GPS band pass filter a noise figure analyzer or a spectrum analyzer with noise option can be used See Fig 11 Fig 5 GPS LNA evaluation board including its connections Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Download...

Страница 9: ...ser Manual UM10453 2 Tone Test BGU7005 and BGU7007 GPS LNA 6 1 1 dB gain compression at 1575 MHz with 850 MHz or 1850 MHz jammers As already stated before signal levels in the GPS frequency band of 130 dBm average will not cause linearity problems in the GPS band itself This of course is also valid for the 1 dB gain compression in band The 1 dB compression point at 1575 MHz caused by cell phone TX...

Страница 10: ...mpression curves with 850 MHz and 1850 MHz jammers At 1 dB Gain drop the Jammer Generator read out for 850 MHz jammer is 7 dBm Vcc 1 8 V Taking into account the approx 20 dB attenuation of the directional coupler this means Pi 1dB 12 1 dBm Fig 8 For 1850 MHz the Jammer Generator read out is 10 9 dBm Vcc 1 8 V Taking into account the approx 20 dB attenuation of the directional coupler this means Pi...

Страница 11: ...nput of the GPS antenna To measure this behavior the setup shown in Fig 11 is used The jammer signal is coupled via a directional coupler to the DUT this is to avoid the jammer signal damaging the noise source The GPS BPF is needed to avoid driving the second stage LNA in saturation For the Jammer Generator a low Phase Noise type is advised This is to avoid extra noise caused by the Jammer Generat...

Страница 12: ...0 5 October 2011 12 of 16 Fig 11 Noise under jamming measurement setup Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com ...

Страница 13: ...for 850 MHz and 1850 MHz jammer signals Fig 12 NF at 1 575 GHz versus jammer power at 850 MHz Fig 13 NF at 1 575 GHz versus jammer power at 1850 MHz Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from A...

Страница 14: ...ss RLin 5 5 5 5 5 5 dB Pin 40 dBm no jammer Output Return Loss RLout 26 26 26 dB Pin 40 dBm no jammer Reverse Isolation ISLrev 24 24 24 dB Pin 40 dBm no jammer Input 1dB Gain Compression Compression Pi 1dB 12 11 10 dBm 1559 MHz to 1610MHz Input third order intercept point IP3i 2 4 4 5 dBm 1 The losses of the connectors and the PCB of approximately 0 05dB are subtracted 2 Jammers at f1 f 138 MHz an...

Страница 15: ... determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of customer s third party customer s Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products NXP Semiconductors does not accept any liability relat...

Страница 16: ...eries inductor 6 4 Required Equipment 7 5 Connections and setup 7 6 Linearity 9 6 1 1 dB gain compression at 1575 MHz with 850 MHz or 1850 MHz jammers 9 7 Noise figure as function of jammer power at 850 MHz and 1850 MHz 11 8 Typical Evaluation Board results 14 9 Legal information 15 9 1 Definitions 15 9 2 Disclaimers 15 9 3 Trademarks 15 10 Contents 16 Downloaded from Arrow com Downloaded from Arr...

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