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Philips NXP BGU7004 GPS LNA, User Manual

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Philips NXP BGU7004 GPS LNA User Manual Download Page 10

 

 

NXP Semiconductors 

UM10491 

 

BGU7004 GPS LNA EVB  

UM10491 

 

© NXP B.V. 2011. All rights reserved. 

User manual 

Rev. 1.0 — 14 June 2011 

10 of 15 

 

 

Fig 9.  Setup for 1 dB compression with jammers 

The gain was measured in the GPS frequency band between port 1 and 2, while 

simultaneously a jammer power signal was swept on port 3. Please note that the drive 

power of the jammer is 20 dB lower at the input of the DUT caused by the directional 

coupler. 

Fig 10

 and 

Fig 11

 show the gain compression curves with 850 MHz and 1850 

MHz jammers respectively.  
The analyzer read out for 850 MHz jammer is +9.3 dBm(see Figure 10) taking into 

account the 20 dB attenuation of the directional coupler means P

i

1 dB = –10.7 dBm.  

For 1850 MHz the read out is +14.42 dBm (see Figure 11) taking into account the 20 dB 

attenuation of the directional coupler means P

i

1 dB = –5.58 dBm. 

           

Summary of Contents for NXP BGU7004 GPS LNA

Page 1: ... BGU7004 GPS LNA evaluation board Rev 1 0 14 June 2011 User manual Document information Info Content Keywords LNA GPS BGU7004 Abstract This document explains the BGU7004 AEC Q100 qualified GPS low noise amplifier evaluation board ...

Page 2: ... rights reserved User manual Rev 1 0 14 June 2011 2 of 15 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 20110614 First Release ...

Page 3: ...rocess The BGU7004 only requires two external components one series inductor for input matching and one decoupling capacitor The BGU7004 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 BGU7004 is ideal for use as GPS LNA in handsets PDA s and PND s The GPS LNA evaluation board EVB ...

Page 4: ...t 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 BGU7004 is available and it is called SiGe C Low Noise Amplifier MMIC for GPS applications 3 Application Board Th...

Page 5: ...2011 5 of 15 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 Vcc or GND Fig 2 Circuit diagram of the BGU7004 evaluation board 3 2 Board Layout Fig 3 Printed circuit board lay out of the BGU7004 GPS LNA evaluation board ...

Page 6: ...n 0 02 3 4 Bill of materials Table 1 BOM of the BGU7004 GPS LNA EVB v2 1 Designator Description Footprint Value Supplier Name type Comment Ac BGU7004 1 45x1 1mm LNA MMIC PCB v2 1 35x20mm BGU7004 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 X...

Page 7: ...d between the Vcc terminal of the evaluation board and the Ven pin of the BGU7004 3 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 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 ...

Page 8: ...ion products in the GPS frequency band 6 1 Out of Band input third order Intercept point This parameter is being measured by a two tone measurement where the carriers have been chosen as L1 138 MHz and L1 276 MHz Where L1 is the center of the GPS band 1575 42 MHz So the two carriers are 1713 42 MHz and 1851 42 MHz that can be seen as two TX jammers in UMTS FDD and GSM1800 cell phone systems One th...

Page 9: ...B gain compression due to 850 MHz and 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 42 MHz caused by cell phone TX jammers however is important Measurements have been carried out using t...

Page 10: ...se note that the drive power of the jammer is 20 dB lower at the input of the DUT caused by the directional coupler Fig 10 and Fig 11 show the gain compression curves with 850 MHz and 1850 MHz jammers respectively The analyzer read out for 850 MHz jammer is 9 3 dBm see Figure 10 taking into account the 20 dB attenuation of the directional coupler means Pi1 dB 10 7 dBm For 1850 MHz the read out is ...

Page 11: ...dB Gain compression 1 575 GHz 850 Mhz jammer Fig 11 1dB Gain compression 1 575 GHz 1850 Mhz jammer 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 12 is used The jammer signal is coupled ...

Page 12: ...S LNA EVB UM10491 NXP B V 2011 All rights reserved User manual Rev 1 0 14 June 2011 12 of 15 1 Jammer frequency is 850 MHz 2 Jammer frequency is 1850 MHz Fig 13 NF at 1 575 GHz versus jammer power Fig 14 NF at 1 575 GHz versus jammer power ...

Page 13: ...8 91 dB 1575 42MHz 16 3 16 4 16 8 1850MHz 14 6 14 2 15 2 Input Return Loss RLin 6 9 7 7 6 dB Output Return Loss RLout 15 9 16 45 17 dB Reverse Isolation ISLrev 22 9 23 1 23 6 dB Input 1dB Gain Compression 850MHz Pi1dB 11 6 10 6 10 5 dBm 1575 42MHz 10 58 9 37 7 7 1850MHz 8 74 7 6 6 3 Input third order intercept point IP3i 2 8 8 5 10 dBm Power settling time Ton 1 4 1 0 9 µs Measured from 10 to 90 an...

Page 14: ...ime 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 medical military aircraft space or life support equipment nor in applications where failure or malfunction of a NXP Semiconductors product can reasonably be expected t...

Page 15: ...ifier UM10491 10 Contents 1 Introduction 3 2 General description 4 3 Application Board 4 3 1 Application Circuit 5 3 2 Board Layout 5 3 3 PCB layout 6 3 4 Bill of materials 6 3 4 1 Series inductor 6 4 Required Equipment 7 5 Connections and setup 7 6 Linearity 8 6 1 Out of Band input third order Intercept point 8 6 2 In band 1dB gain compression due to 850 MHz and 1850 MHz jammers 9 7 Noise figure ...

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