UM10459 User manual for the BGU7007 GPS LNA evaluation board
Contents
1. so the losses of the connectors and the PCB of approximately 0 1dB are not subtracted 2 Jammers atf f 138 MHz and f f 276 MHz where f 1575 42 MHz UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 14 of 16 NXP Semiconductors UM10459 User manual for the BGU7007 GPS LNA evaluation board 9 Legal information 9 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 9 2 Disclaimers Limited warranty and liability Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages including without limitation lost profits lost savings business interruption costs related to the removal or replacement of2. MHz or 1850 MHZ jammets eeeeeeeeeeeeeeee 9 Noise figure as function of jammer power at 850 MHZ and 1850 MHZ ccseccsseeesseeenseeeeeeee 12 Typical Evaluation Board results 0 14 Legal information cccssseeeesseeeeeseseeeensseenenees 15 Definitions ikcegtsstletietieestpedectencdaeedie daw et 15 DISCIAIMIOES isian ae eaea Esia 15 PradeMarks ia a aia eee araa Eaa 15 COMMONS ices cccncisctcccceccdcceccciccccedccdie cncteseccvesstezseess 16 Please be aware that important notices concerning this document and the product s described herein have been included in the section Legal information NXP B V 2011 All rights reserved For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 11 March 2011 Document identifier UM10459
3. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product design It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned UM10459 All information provided in this document is subject to legal disclaimers 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 related to any default damage costs or problem which is based on any weakness or default in the customer s applications or products or the application or use by customer s third party customer s Customer is responsible for doing all necessary testing for the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer s NXP does not accept any liability in this respect Export control This docum
4. any products or rework charges whether or not such damages are based on tort including negligence warranty breach of contract or any other legal theory Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical systems or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors accepts no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only
5. it might damage the BGU7007 Jumper JU1 is connected between the Vec terminal of the evaluation board and the Ven pin of the BGU7007 To evaluate the power on settling time ton and the power off settling time tog it is also possible to use a separate voltage on the Ven eventually this voltage can be supplied by a pulse generator In this case jumper JU1 should be removed The definition of ton is the time from 10 to 90 of the maximum signal level and for to the time from 90 to 10 of the maximum signal level Connect the RF signal generator and the spectrum analyzer to the RF input and the RF output of the evaluation board respectively Do not turn on the RF output of the Signal generator yet set it to 40 dBm output power at 1575 42 MHz set the spectrum analyzer at 1575 42 MHz center frequency and a reference level of 0 dBm Turn on the DC power supply and it should read approximately 5 mA Enable the RF output of the generator the spectrum analyzer displays a tone of around 25 dBm at 1575 42 MHz Instead of using a signal generator and spectrum analyzer one can also use a network analyzer in order to measure gain as well as in and output return loss For noise figure evaluation either a noise figure analyzer or a spectrum analyzer with noise option can be used The use of a 15 dB noise source like the Agilent All information provided in this document is subject to legal disclaimers NXP B V 2011 A
6. on the In band and Out of Band Third Order Intercept points are described in more detail in a separate User Manual UM10453 2 Tone Test BGU7005 and BGU7007 GPS LNA 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 jammers however is important Measurements have been carried out using the set up shown in Fig 6 The jammer signal is coupled via a directional coupler to the DUT For the P1dB measurements this not required but connecting it this way the setup can also be used for NF measurements as described in the next paragraph CABLE2 RF GENERATOR 2 JAMMER 20 dB C Pi ae o RF GENERATOR 4 w o 1 DIRECTIONAL COUPLER BGU7007 GPS LNA EVB SPECTRUM ANALYZER TI 019aab875 Fig 6 Setup for 1 dB compression with jammers All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 9 of 16 NXP Semiconductors UM10459 User manual for the BGU7007 GPS LNA evaluation board The gain of the DUT was measured between port RFin and RFout of the EVB at the GPS frequency 1575 MHz while simultaneous
7. UM10459 User manual for the BGU7007 GPS LNA evaluation board Rev 1 11 March 2011 User manual Document information Info Content Keywords LNA GPS BGU7007 Absiract This document explains the BGU7007 GPS low noise amplifier evaluation board NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board Revision history Rev Date Description v 1 20110311 First release Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 2 of 16 NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board 1 Introduction NXP Semiconductors BGU7007 is a low noise amplifier for GPS receiver applications in a plastic leadless 6 pin extremely thin small outline SOT886 package It has a gain of 18 5 dB and a noise figure of 0 9 dB incl board losses or 0 85 dB board losses subtracted It has superior linearity performance to suppress interference and noise from co habitation cellular transmitters while retaining sensitivity The LNA has been designed using NXP Semiconductors advanced 110 GHz fr SiGe C process The BGU7007 only requires two external components one series inductor for input matching and one d
8. XP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board 4 Required Equipment In order to measure the evaluation board the following is necessary DC Power Supply up to 30 mA at 1 5 V to 2 85 V Two RF signal generators capable of generating an RF signal at the operating frequency of 1575 42 MHz as well as the jammer frequencies 850 MHz 1713 42 MHz 1850 MHz and 1851 42 MHz An RF spectrum analyzer that covers at least the operating frequency of 1575 42 MHz as well as a few of the harmonics so up to 6 GHz should be sufficient Optional a version with the capability of measuring noise figure is convenient Amp meter to measure the supply current optional A network analyzer for measuring gain return loss and reverse Isolation Noise figure analyzer and noise source Directional coupler Proper RF cables 5 Connections and setup UM10459 The BGU7007 GPS LNA evaluation board is fully assembled and tested Please follow the steps below for a step by step guide to operate the evaluation board and testing the device functions 1 Measure the cable and directional coupler losses at the frequencies which are used during the evaluation 1575 MHz 850 MHz and 1850 MHz These losses are used to correct the measured power levels Connect the DC power supply to the Vec and GND terminals Set the power supply to the desired supply voltage between 1 5 V and 2 85 V but never exceed 3 1 V as
9. a logic signal In disabled mode it consumes less than pA The output of the BGU7007 is internally matched for 1575 42 MHz whereas only one series inductor at the input is needed to achieve the best RF performance Both the input and output are AC coupled via an integrated capacitor Only two external components are required to build a GPS LNA with the following advantages e Low noise e High gain e High linearity under jamming e Very low package height 0 5 mm e Low current consumption e Short power settling time The data sheet of the BGU7007 is available and it is called SiGe C Low Noise Amplifier MMIC for GPS applications 3 Application Board The BGU7007 GPS LNA evaluation board simplifies the evaluation of the BGU7007 GPS LNA for the GPS application The evaluation board enables testing of the device performance and requires no additional support circuitry The board is fully assembled with the BGU7007 including the input series inductor as well as a decoupling capacitor to optimize the performance The board is supplied with two SMA connectors for input and output connection to RF test equipment The BGU7007 can operate from a 1 5 V to 2 85 V single supply and consumes about 5 mA UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 4 of 16 NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA
10. dB dB 2 5 2 5 1 1 5 15 3 2 3 0 5 0 5 40 35 30 25 20 15 10 5 40 35 30 25 20 15 10 5 P_Jammer at input DUT dBm P_Jammer at input DUT dBm 1 Vec 1 5V 1 Vec 1 5V 2 Vec 1 8V 2 Vec 1 8V 3 Vcc 2 85 V 3 Vcc 2 85 V Fig 14 NF at 1 575 GHz versus jammer power at 850 Fig 15 NF at 1 575 GHz versus jammer power at 1850 MHz MHz UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 13 of 16 NXP Semiconductors UM10459 User manual for the BGU7007 GPS LNA evaluation board 8 Typical Evaluation Board results Table 2 Typical results measured on the Evaluation Boards Operating Frequency is f 1575 42 MHz unless otherwise specified Temp 25 C Parameter Symbol Supply Voltage Vec Supply Current loc Noise Figure NF Power Gain Gp Input Return Loss RLin Output Return Loss RLout Reverse Isolation ISLrev Input 1dB Gain Compression Pi1dB Input third order intercept point IP3 BGU7007 BGU7007 BGU7007 Unit 1 5 1 8 2 85 V 3 4 4 8 6 1 mA 0 9 0 9 0 9 dB 16 5 18 5 20 5 dB 5 7 dB 12 18 z dB 22 24 dB 13 12 11 dBm 4 4 5 dBm Remarks Pin lt 40 dBm no jammer Pin lt 40 dBm no jammer Pin lt 40 dBm no jammer Pin lt 40 dBm no jammer Pin lt 40 dBm no jammer 1 The NF and Gain figures are being measured at the SMA connectors of the evaluation board
11. ecoupling capacitor The BGU7007 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 BGU7007 is ideal for use as GPS LNA in smart phones feature phones and Portable Navigation Devices The GPS LNA evaluation board EVB see Fig 1 is designed to evaluate the performance of the BGU7007 applied as a GPS LNA In this document the application diagram board layout bill of materials and typical results are given as well as some explanations on GPS related performance parameters like out of band input third order intercept point gain compression under jamming and noise under jamming 019aab870 Fig 1 BGU7007 GPS LNA evaluation board UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 3 of 16 NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board 2 General description NXP Semiconductors BGU7007 GPS low noise amplifier is dedicated for the GNSS frequency band GPS GLONASS and Galileo positioning systems The integrated biasing circuit is temperature stabilized which maintains a constant current over temperature It also enables the superior linearity performance of the BGU7007 It is also supplied with an enable function that allows it to be controlled with
12. ent as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from national authorities Evaluation products This product is provided on an as is and with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of this product remains with customer In no event shall NXP Semiconductors its affiliates or their suppliers be liable to customer for any special indirect consequential punitive or incidental damages including without limitation damages for loss of business business interruption loss of use loss of data or information and the like arising out the use of or inability to use the product whether or not based on tort including negligence strict liability breach of contract breach of warranty or any other theory even if advised of the possibility of such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and custome
13. evaluation board 3 1 Application 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 Ves or GND BGU7007 GPS LNA 019aab871 Fig 2 Circuit diagram of the BGU7007 evaluation board 3 2 Board layout ooo cacao 8 o o o e o o i o o 019aab872 Fig 3 Printed circuit board lay out of the BGU7007 GPS LNA evaluation board UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 5 of 16 NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board 3 3 PCB layout A good PCB layout is an essential part of an RF circuit design The evaluation board of the BGU7007 can serve as a guideline for laying out a board using the BGU7007 Use controlled impedance lines for all high frequency inputs and outputs Bypass Ves with decoupling capacitors preferably located as close as possible to the device For long bias lines it may be necessary to add decoupling capacitors along the line further away from the device Proper grounding of the GND pins is also essential for good RF performance Either connect the GND pins directly to the ground plane or through vias or do both The material that has been used for the evaluation board is FR4 using the stack shown in Fig 4 20 um C
14. iconductors UM10459 User manual for the BGU7007 GPS LNA evaluation board 14 019aab878 22 019aab879 Icc Gain mA dB 12 20 10 18 1 2 3 8 16 1 2 3 6 14 4 12 40 30 10 0 40 30 20 10 0 P_Jammer at input DUT dBm P_Jammer at input DUT dBm 1 Vec 1 5V 1 Vec 1 5V 2 Vec 1 8V 2 Vec 1 8V 3 Vcc 2 85 V 3 Vcc 2 85 V Pin 1575 MHZ 45 dBm Pin 1575 MHZ 45 dBm Fig 9 Icc versus jammer power at 1850 MHz Fig 10 Gain versus jammer power at 1850 MHz UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 11 of 16 NXP Semiconductors UM10459 User manual for the BGU7007 GPS LNA evaluation board 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
15. ll rights reserved User manual Rev 1 11 March 2011 7 of 16 NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board 364B is recommended When measuring the noise figure of the evaluation board any kind of adaptors cables etc between the noise source and the evaluation board should be avoided since this affects the noise performance 9 For noise under jamming conditions the following is needed A 15 dB 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 019aab874 Fig 5 GPS LNA evaluation board including its connections UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 8 of 16 NXP Semiconductors U M1 0459 6 Linearity User manual for the BGU7007 GPS LNA evaluation board UM10459 6 1 At the average power levels of 130 dBm that have to be received by a GPS receiver the system will not have in band intermodulation problems caused by the GPS signal itself Strong out of band cell phone TX jammers however can cause linearity problems and result in third order intermodulation products in the GPS frequency band In this chapter the effects of these Jammer signals on the Noise and Gain performance of the BGU7007 are described The effect of these Jammers
16. ly a jammer power signal was swept at the 20 dB attenuated input port of the Directional Coupler Please note that the drive power of the jammer is 20 dB lower at the input of the DUT caused by the directional coupler The figures below show the supply current lec and gain compression curves with 850 MHz and 1850 MHz jammers At 1 dB Gain drop the Jammer Generator read out for 850 MHz jammer is 5 6 dBm V 2 85 V Taking into account the approx 20 dB attenuation of the directional coupler this means Pi1 dB 14 74 dBm Fig 8 For 1850 MHz the Jammer Generator read out is 12 8 dBm Vec 2 85 V Taking into account the approx 20 dB attenuation of the directional coupler this means Pil dB 7 54 dBm Fig 10 14 019aab876 22 019aab877 Icc Gain mA dB 12 20 1 10 2 18 3 8 16 1 2 6 44 3 4 12 20 10 0 40 30 20 10 0 P_Jammer at input DUT dBm P_Jammer at input DUT dBm 1 Vec 1 5V 1 Vec 1 5V 2 Vec 1 8V 2 Vec 1 8V 3 Vcc 2 85 V 3 Vcc 2 85 V Pin 1575 MHZ 45 dBm Pin 1575 MHZ 45 dBm Fig 7 Icc versus jammer power at 850 MHz Fig 8 Gain versus jammer power at 850 MHz UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 10 of 16 NXP Sem
17. r s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars US 5 00 The foregoing limitations exclusions and disclaimers shall apply to the maximum extent permitted by applicable law even if any remedy fails of its essential purpose 9 3 Trademarks Notice All referenced brands product names service names and trademarks are property of their respective owners NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 15 of 16 NXP Semiconductors UM10459 User manual for the BGU7007 GPS LNA evaluation board 10 Contents 3 1 3 2 3 3 3 4 3 4 1 9 1 9 2 9 3 10 INtFODUCTION jisiccsdecsscerdecseecsicadecesesntenssancdursseeaeeneace 3 General GeSCriptiOn ccsseceeeeeeeeeeeeeneeeeeeeeeees 4 Application Board ccscesssseesseeeessseeeneeenens 4 Application circuit n 5 Board lAVOUt c cccccecsedebeatsecceesconsensseeeesnscinenerseess 5 PCB AVOUT viccicesieceseceeigs ceshesiedeestepeseerent ne eecteeeads 6 Bill Of materials cccccceesesceeeeeeeeeessneeeeesees 6 Series iNGUCHOS eceecceeeeceeeessneeeeeseeeeeesneeeeees 6 Required Equipment c cccssseessseeessseeenseseee 7 Connections and Setup ccsecsseeseeesseeeeeeeeees 7 Linearity 1 dB gain compression at 1575 MHz with 850
18. to avoid extra noise caused by the Jammer Generator at measurement frequency 1575 MHz oe A RF GENERATOR gt JAMMER CABLE1 20 8 gd CY O r kal DIRECTIONAL COUPLER CABLE3 m NOISE SOURCE aa 1 BGU7007 GPS LNA EVB GPS saw 24 stage BPF LNA uM NOISE X gt e ANALYZER 77 019aab880 Fig 11 Noise under jamming measurement setup UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 12 of 16 NXP Semiconductors U M1 0459 User manual for the BGU7007 GPS LNA evaluation board In the figures below the supply current lec the noise figure NF and gain as function of jammer power are given for 850 MHz and 1850 MHz jammer signals 14 019aab881 14 019aab882 Icc Icc mA mA 12 12 1 2 10 2 19 3 3 8 8 6 6 4 4 40 35 30 25 20 15 10 5 40 35 30 25 20 15 10 5 P_Jammer at input DUT dBm P_Jammer at input DUT dBm 1 Vec 1 5V 1 Vec 1 5V 2 Vec 1 8V 2 Vec 1 8V 3 Vcc 2 85 V 3 Vcc 2 85 V Fig 12 Icc versus jammer power at 850 MHz Fig 13 Icc versus jammer power at 1850 MHZ 35 019aab883 35 019aab884 NF 1 NF
19. u 0 2 mm FR4 critical 20 um Cu 0 8 mm FR4 only for mechanical rigidity of PCB 20 um Cu 019aab873 Fig 4 Stack of the PCB material Material supplier is ISOLA DURAVER er 4 6 4 9 Tan 0 02 3 4 Bill of materials Table 1 BOM of the BGU7007 GPS LNA EVB v2 1 Designator Description Footprint Value Supplier Name type Comment Ac BGU7007 1 45 mmx 1 1 mm 7 LNA MMIC PCB v2 1 35 mm x 20 mm BGU7007 GPS gt LNA EVB C1 Capacitor 0402 1 nF Murata GRM1555 Decoupling L1 Inductor 0402 5 6 nH Murata LQW15A High Q low Rs Input matching X1 X2 SMA RF Johnson End launch SMA 142 RF input RF connector 0701 841 output X3 DC header Molex PCB header Right Angle Bias connector 1 row 3 way 90121 0763 X4 JUMPER Molex PCB header Vertical 1 Connect Ven to stage row 3 way 90120 0763 Vec or separate Ven voltage JU1 Jumper 3 4 1 Series inductor The evaluation board is supplied with Murata LQW15series inductor of 5 6 nH This is a wire wound type of inductor with high quality factor Q and low series resistance Rs This type of inductor is recommended in order to achieve the best noise performance High Q inductors from other suppliers can be used If it is decided to use other low cost inductors with lower Q and higher Rs the noise performance will degrade UM10459 All information provided in this document is subject to legal disclaimers NXP B V 2011 All rights reserved User manual Rev 1 11 March 2011 6 of 16 N
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