NXP Semiconductors BGU7008 User Manual
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NXP Semiconductors BGU7008 User Manual

Gps lna evaluation board
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UM10488
User manual for the BGU7008 GPS LNA evaluation board
Rev. 1.0 — 9 June 2011
Document information
Info
Content
Keywords
LNA, GPS, BGU7008
Abstract
This document explains the BGU7008 AEC-Q100 qualified GPS low
noise amplifier evaluation board
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  • Page 1 UM10488 User manual for the BGU7008 GPS LNA evaluation board Rev. 1.0 — 9 June 2011 User manual Document information Info Content Keywords LNA, GPS, BGU7008 Abstract This document explains the BGU7008 AEC-Q100 qualified GPS low noise amplifier evaluation board...
  • Page 2 UM10488 NXP Semiconductors BGU7008 GPS LNA EVB Revision history Date Description 20110609 First Release. Contact information For additional information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com UM10488 © NXP B.V. 2011. All rights reserved.

  • Page 3: Introduction

    It is also supplied with an enable function allowing it to be controlled by a logic signal. The BGU7008 is ideal for use as GPS LNA in smart phones, feature phones and Portable Navigation Devices.

  • Page 4: General Description

     Very low package height 0.5mm;  Low current consumption;  Short power settling time; The data sheet of the BGU7008 is available, and it is called “SiGe:C Low Noise Amplifier MMIC for GPS applications” 3. Application Board The BGU7008 GPS LNA evaluation board simplifies the evaluation of the BGU7008 GPS LNA for the GPS application.

  • Page 5: Application Circuit

    With jumper JU1 the enable pin can be controlled to either to V or GND. Fig 2. Circuit diagram of the BGU7008 evaluation board Board Layout Fig 3. Printed circuit board lay-out of the BGU7008 GPS LNA evaluation board UM10488 © NXP B.V. 2011. All rights reserved. User manual Rev.

  • Page 6: Pcb Layout

    A good PCB layout is an essential part of an RF circuit design. The evaluation board of the BGU7008 can serve as a guideline for laying out a board using the BGU7008. Use controlled impedance lines for all high frequency inputs and outputs. Bypass V with decoupling capacitors, preferably located as close as possible to the device.

  • Page 7: Required Equipment

    Proper RF cables.  5. Connections and setup The BGU7008 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).
  • Page 8 UM10488 NXP Semiconductors BGU7008 GPS LNA EVB 9. For noise under jamming conditions, the following is needed. A 15dB 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.

  • Page 9: Linearity

    Jammer-signals on the Noise and Gain performance of the BGU7008 are described. The effect of these Jammers on the In-band and Out-of-Band Third-Order Intercept points are described in more detail in a separate User Manual: UM10489: 2-Tone Test BGU7004 and BGU7008 GPS LNA.
  • Page 10 UM10488 NXP Semiconductors BGU7008 GPS LNA EVB The figures below show the supply-current (Icc) 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 (Vcc=2.85 V). Taking into account the approx 20 dB attenuation of the directional coupler this means Pi1 dB = –14.74 dBm (Figure 8).

  • Page 11: Noise Figure As Function Of Jammer Power At 850 Mhz And 1850 Mhz

    UM10488 NXP Semiconductors BGU7008 GPS LNA EVB 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...
  • Page 12 UM10488 NXP Semiconductors BGU7008 GPS LNA EVB In the figures below the supply-current (Icc), the noise figure (NF) and gain as function of jammer power are given for 850 MHz and 1850 MHz jammer signals. Icc vs Jammer Power at 850MHz Icc vs Jammer Power at 1850MHz Vcc=1.5V...

  • Page 13: Typical Evaluation Board Results

    UM10488 NXP Semiconductors BGU7008 GPS LNA EVB 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 BGU7008 BGU7008 BGU7008 Unit Remarks Supply Voltage 2.85...

  • Page 14: Legal Information

    Evaluation products — This product is provided on an “as is” and “with all In no event shall NXP Semiconductors be liable for any indirect, incidental, faults” basis for evaluation purposes only. NXP Semiconductors, its affiliates...

  • Page 15: Table Of Contents

    UM10488 NXP Semiconductors BGU7008 GPS LNA EVB 10. Contents Introduction ............3 General description ..........4 Application Board ..........4 Application Circuit ............... 5 Board Layout ..............5 PCB layout ................6 Bill of materials ..............6 3.1.1 Series inductor ........... 6 Required Equipment ...........

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