AN11103 Externally-matched 900 MHz LNA using BGU7005

AN11103
Externally-matched 900 MHz LNA using BGU7005
Rev. 1 — 7 December 2011
Application note
Document information
Info
Content
Keywords
BGU7005, LNA, externally matched
Abstract
This application note describes an evaluation board design using the
BGU7005 for an externally-matched 900 MHz ISM band LNA. Board
schematic, circuit simulation, layout, BOM and typical performance
characteristics are provided.
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
Revision history
Rev
Date
Description
v.1
20111207
first issue
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
AN11103
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
2 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
1. Introduction
The BGU7005 is a Low Noise Amplifier (LNA) for Global Positioning Systems (GPS)
receiver applications in a plastic leadless 6-pin, extremely small SOT886 package. The
BGU7005 requires only one external matching inductor and one external decoupling
capacitor. The BGU7005 adapts itself to the changing environment resulting from
co-habitation of different radio systems in modern cellular handsets. It is designed for
low-power consumption and optimal jamming performance when signals from co-existing
cellular transmitters are present. At low jamming power levels, it delivers 16.5 dB gain at a
noise figure of 0.9 dB. During high jamming power levels, resulting, for example, from a
cellular transmit burst, it temporarily increases its bias current to improve sensitivity.
The BGU7005 can be rematched externally to other frequency bands for suit various
applications.
The evaluation board is tuned to achieve optimal performance in the 900 MHz Industrial,
Scientific, Medical (ISM) band. It is suitable for evaluating various applications due to the
low current, high gain and low noise figure of the BGU7005.
aaa-000744
Fig 1.
BGU7005 900 MHz band LNA evaluation board Printed-Circuit Board (PCB) layout
2. General description
The BGU7005 LNA evaluation board is optimized to evaluate the performance of the
BGU7005 in a 900 MHz ISM band application. This document provides circuit simulations,
Agilent Design System (ADS) results, application schematic, board layout, Bill Of
Materials (BOM), and typical test results.
AN11103
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
3 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
3. Application circuit simulation
3.1 BGU7005 900 MHz band LNA simulation
Assumptions
• 50  termination at input and output
• Data file for S-parameter and noise at 1.8 V used
• 1.8 V supply voltage
L1 = 24 nH
BGU7005
L2 = 16 nH
C1 = 2.4 pF
Z = 50 Ω
Z = 50 Ω
aaa-000745
Fig 2.
Application circuit simulation
3.2 BGU7005 900 MHz band LNA simulation result
aaa-000746
Fig 3.
AN11103
Application note
Input and output match
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Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
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AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
20
s21
(dB)
15
m10
aaa-000747
m12
10
5
0
-5
0.4
0.8
1.2
1.6
f (GHz)
2.0
m10 frequency = 900 MHz; s21 = 19.5 dB.
m12 frequency = 950 MHz; s21 = 19.338 dB.
Fig 4.
Gain
aaa-000748
6
NF
(dB)
4
2
0
0.4
m9
m13
m11
(1)
m14
0.8
1.2
1.6
f (GHz)
2.0
m9 frequency = 900 MHz; NF = 1.384.
m11 frequency = 950 MHz; NF = 1.454.
m13 frequency = 900 MHz; NF = 0.817.
m14 frequency = 950 MHz; NF = 0.822.
(1) Minimum noise figure.
Fig 5.
AN11103
Application note
Noise figure
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Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
5 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
aaa-000749
5
stability
factor
4
3
2
1
0
0.0
Fig 6.
2.0
4.0
f (GHz)
6.0
Stability
4. Evaluation board
The BGU7005 900 MHz band LNA evaluation board simplifies the evaluation of the
BGU7005 application. The evaluation board enables device performance testing and
requires no additional support circuitry. The board is fully assembled with the BGU7005
IC, including input and output matching for optimum performance.
The board is supplied with two SMA connectors for input and output connection to RF test
equipment.
The BGU7005 is designed to operate at 1.8 V for optimal performance not exceeding
2.85 V. If the evaluation board is to be powered at a different supply voltage such as 3.3 V
or 3.7 V, calculate the value of volt-drop resistor R1 and change it accordingly.
J2
CON-3PIN
VCC = 1.8 V
1 2 3
J1
R1
0Ω
CON-2PIN
J5
1
L2
20 nH
RF-IN
5
3
2 CON-SMA-1
RF-IN
C2
1000 pF
VCC
U1
3
ENABLE
1 2
4
RF-OUT
6
GND
2
GND
1
L3
15 nH
3 J6
C8
2.4 pF
1
2 CON-SMA-1
RF-OUT
U1BGU7005
aaa-000750
Fig 7.
AN11103
Application note
Evaluation board schematic
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
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AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
4.1 Bill of materials (900 MHz band)
Table 1.
BGU7005 900 MHz band LNA evaluation board BOM
Vendor[1]
Item
Quantity
Part reference
Part number
1
1
C2
GRM1555C1H102 Murata
JA01
1000 pF
2
1
C8
GRM1555C1H2R4 Murata
CZ01D
2.4 pF
3
1
J1
90120-0762
Molex
CON-2PIN
4
1
J2
90120-0763
Molex
CON-3PIN
5
2
J5, J6
901-10110
Amphenol
6
1
L2
0402CS-20NX_LU Coilcraft
20 nH
7
1
L3
0402CS-15NX
Coilcraft
15 nH
8
1
R1
CRCW04020000Z
0ED
Vishay/Dale
0
9
1
U1
BGU7005
NXP
Semiconductors
BGU7005
[1]
Value
CON-SMA-1
Sourcing materials from a different vendor may affect performance.
4.2 Typical evaluation board test results (900 MHz band)
aaa-000751
Fig 8.
AN11103
Application note
S-parameter gain and matching
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Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
7 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
aaa-000752
Fig 9.
P1 dB
aaa-000753
Tone spacing = 1 MHz.
Fig 10. Linearity (IP3)
AN11103
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
8 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
aaa-000754
Fig 11. Stability (K factor)
4.2.1 Noise figure measurement
A 6 dB pad is placed between the noise source and RF input to improve the noise figure
measurement accuracy. A network analyzer shows that the 6 dB pad is 5.9 dB at
900 MHz.
A network analyzer is used to measure the loss between the connector to the first
matching component of the device. The measured return loss is 0.2 dB, therefore a
0.1 dB input loss must be taken into account to get the true noise figure.
Overall 6 dB loss at input and 0.1 dB loss at output are subtracted from the noise figure
analyzer measurement.
AN11103
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
9 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
aaa-000755
Fig 12. Noise figure
4.2.2 Typical evaluation board test results summary
Table 2.
AN11103
Application note
Typical results measured on the BGU7005 900 MHz band evaluation board
Parameter
Symbol
Value
Unit
Supply voltage
VCC
1.8
V
Supply current
ICC
4.16
mA
Noise figure
NF
1.38
dB
Power gain
GP
18.97
dB
Input return loss
RLin
16.1
dB
Output return loss
RLout
12.8
dB
Reverse isolation
isol(r)
29.1
dB
input power at 1 dB gain compression
Pi(1dB)
15.52
dBm
output power at 1 dB gain compression
PL(1dB)
2.61
dBm
Input third-order intercept point
IP3I
5.0
dBm
Output third-order intercept point
IP3O
12.39
dBm
Rollett stability factor (0 GHz to 26 GHz)
K
>1
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
10 of 12
AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
5. Legal information
5.1
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.
5.2
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 of 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. 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
AN11103
Application note
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 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 document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent 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 customer’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.
5.3
Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 December 2011
© NXP B.V. 2011. All rights reserved.
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AN11103
NXP Semiconductors
Externally-matched 900 MHz LNA using BGU7005
6. Contents
1
2
3
3.1
3.2
4
4.1
4.2
4.2.1
4.2.2
5
5.1
5.2
5.3
6
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General description . . . . . . . . . . . . . . . . . . . . . . 3
Application circuit simulation. . . . . . . . . . . . . . 4
BGU7005 900 MHz band LNA simulation . . . . 4
BGU7005 900 MHz band LNA simulation
result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Evaluation board . . . . . . . . . . . . . . . . . . . . . . . . 6
Bill of materials (900 MHz band). . . . . . . . . . . . 7
Typical evaluation board test results
(900 MHz band) . . . . . . . . . . . . . . . . . . . . . . . . 7
Noise figure measurement . . . . . . . . . . . . . . . . 9
Typical evaluation board test results
summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Legal information. . . . . . . . . . . . . . . . . . . . . . . 11
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in 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: 7 December 2011
Document identifier: AN11103