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OM7624/BGU7005,598

P1-P3P4-P6P7-P9P10-P12P13-P14
NXP Semiconductors
UM10380
BGU7005 GPS LNA EVB
2. General description
NXP Semiconductors’ BGU7005 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 BGU7005. 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 that 1µA.
The output of the BGU7005 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 BGU7005 is available, and it is called “SiGe:C Low Noise Amplifier
MMIC for GPS applications”
3. Application Board
The BGU7005 GPS LNA evaluation board simplifies the evaluation of the BGU7005 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 BGU7005, 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 BGU7005 can operate from a 1.5V to
2.85V single supply and consumes about 5 mA.
UM10380_1 © NXP B.V. 2009. All rights reserved.
User manual Rev. 01 — 3 November 2009 4 of 14
NXP Semiconductors
UM10380
BGU7005 GPS LNA EVB
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 V
cc
or GND.
1
2
4
5
BGU7005
63
X3
JU1
X4
GND V
en
V
cc
L1
C1
RF in
RF out
X1
X2
Fig 2. Circuit diagram of the BGU7005 evaluation board
3.2 Board Layout
UM10380_1 © NXP B.V. 2009. All rights reserved.
User manual Rev. 01 — 3 November 2009 5 of 14
Fig 3. Printed circuit board lay-out of the BGU7005 GPS LNA evaluation board
NXP Semiconductors
UM10380
BGU7005 GPS LNA EVB
3.3 PCB layout
A good PCB layout is an essential part of an RF circuit design. The evaluation board of
the BGU7005 can serve as a guideline for laying out a board using the BGU7005. Use
controlled impedance lines for all high frequency inputs and outputs. Bypass V
cc
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
UM10380_1 © NXP B.V. 2009. All rights reserved.
User manual Rev. 01 — 3 November 2009 6 of 14
0.2mm FR4 critical
0.8mm FR4 only for
mechanical rigidity of PCB
20um Cu
20um Cu
20um Cu
Fig 4. Stack of the PCB material
Material supplier is ISOLA DURAVER; εr = 4.6 - 4.9: Tanδ = 0.02
3.4 Bill of materials
Table 1 BOM of the BGU7005 GPS LNA EVB v2.1
Designator Description Footprint Value Supplier Name/type Comment
Ac BGU7005 1.45x1.1mm LNA MMIC
PCB v2.1 35x20mm BGU7005 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, 1
row, 3 way 90121-0763
Bias connector
X4 JUMPER
stage
- - Molex, PCB header, Vertical, 1 row,
3 way 90120-0763
Connect V
en
to
V
cc
or separate
V
en
voltage
JU1 Jumper
3.4.1 Series inductor
The evaluation board is supplied with Murata LQW15series inductor of 5.6nH. This is a
wire wound type of inductor with high quality factor (Q) and low series resistance (R
s
).
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 R
s
the noise performance will degrade.
P1-P3P4-P6P7-P9P10-P12P13-P14

OM7624/BGU7005,598

Mfr. #:
Buy OM7624/BGU7005,598
Manufacturer:
NXP Semiconductors
Description:
RF EVAL FOR BGU7005
Lifecycle:
New from this manufacturer.
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