UM10491
User manual for the BGU7004 GPS LNA evaluation board
Rev. 1.0 — 14 June 2011
User manual
Document information
Info
Keywords
Abstract
Content
LNA, GPS, BGU7004
This document explains the BGU7004 AEC-Q100 qualified GPS low
noise amplifier evaluation board
NXP Semiconductors
UM10491
BGU7004 GPS LNA EVB
Revision history
Rev
1.0
Date
20110614
Description
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
UM10491
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.0 — 14 June 2011
2 of 15
NXP Semiconductors
UM10491
BGU7004 GPS LNA EVB
1. Introduction
NXP Semiconductors’ BGU7004 is an AEC-Q100 qualified low-noise amplifier for GPS
receiver applications in a plastic, leadless 6 pin, extremely thin small outline SOT886
package. It has a gain of 16.5 dB gain and a noise figure of 0.8 dB, 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 f
T
SiGe:C
process. 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) see
Fig 1.
is designed to evaluate the
performance of the BGU7004 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.
Fig 1. BGU7004 GPS LNA evaluation board
UM10491
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.0 — 14 June 2011
3 of 15
NXP Semiconductors
UM10491
BGU7004 GPS LNA EVB
2. General description
NXP Semiconductors’ BGU7004 GPS low noise amplifier is dedicated for the GPS
frequency band. The integrated biasing circuit is temperature stabilized, which maintains
a constant current over temperature. It also enables the superior linearity performance of
the BGU7004. It is also supplied with an enable function that allows it to be controlled
with a logic signal. In disabled mode it only consumes less than 1µA.
The output of the BGU7004 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:
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
The BGU7004 GPS LNA evaluation board simplifies the evaluation of the BGU7004 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 BGU7004, 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 BGU7004 can operate from a 1.5V to
2.85V single supply and consumes about 5 mA.
UM10491
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.0 — 14 June 2011
4 of 15
NXP Semiconductors
3.1 Application Circuit
UM10491
BGU7004 GPS LNA EVB
The circuit diagram of the evaluation board is shown in
Fig 2.
With jumper JU1 the enable pin can be controlled to either to V
cc
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
UM10491
© NXP B.V. 2011. All rights reserved.
User manual
Rev. 1.0 — 14 June 2011
5 of 15
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