Application Notes

AN11228
BGA301x Wideband Variable Gain Amplifier Application
Rev. 2 — 3 February 2014
Application note
Document information
Info
Content
Keywords
BGA3015, BGA3018, BAP70Q, CATV, Line-up, VGA, Evaluation board
Abstract
This application note describes the schematic and layout requirements
for using the BGA3015 and BGA3018 drop amplifiers together with the
BAP70Q quad pin diode in a CATV VGA application.
AN11228
NXP Semiconductors
BGA301x Wideband Variable Gain Amplifier Application
Revision history
Rev
Date
Description
2
20140203
Updated with improved application circuit and test data
1
20121012
First version
Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
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1. Introduction
With the use of NXP’s BGA301x drop amplifiers and the BAP70Q quad pin diode
attenuator a wideband Variable Gain Amplifier (VGA) has been made which can be used
as line-up amplifier in CATV networks.
The combination of NXP’s BGA301x amplifiers and BAP70Q pin diode parts a high gain
amplifier with low noise figure and wide dynamic range can be made.
This application note describes the evaluation board schematic and layout requirements,
and shows the test results.
2. System features
• 75 Ω input and output impedance
• Gain control dynamic range of 20 dB
• Flat gain between 40 MHz and 1003 MHz
• Unconditionally stable
• Excellent input and output return loss
3. Customer evaluation kit contents
The evaluation kit contains the following items:
• ESD safe casing
• BGA301x VGA evaluation board
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4. Application information
The evaluation circuit can be seen in figure 1 and the corresponding PCB is shown in
figure 2. Table 1 shows the bill of materials.
4.1 Evaluation board circuit
Fig 1.
VGA evaluation circuit
The connector pinning is as followed:
- “GND” : Ground pins
- “Vamp1” : +8 V power supply for amplifier U1
- “Vamp2” : +8 V power supply for amplifier U3
- “Vcc” : +8 V power supply for pin diode attenuator U2
- “Vctr” : Pin diode attenuator control voltage (1 … 3 V)
At connector J1 the RF signal from an external optical receiver is applied, where C1
provides DC-blocking, followed by L1 for S11 matching of the BGA3018 amplifier (U1).
The feedback of amplifier U1 is provided via R1 & R2 with C2 for DC-blocking between
the input and output pins of the amplifier. Two resistors are used to lower the influence of
the parasitic capacitance from the circuit board. The output of amplifier U1 is matched
with L4 and C6 provides the DC-blocking towards pin-diode attenuator U2.
The signal out of the first amplifier has a large dynamic range and with use of the
BAP70Q pin diode attenuator (U2) the RF signals can be attenuated in such a way that a
stable RF signal will be available at the output of the pin-diode attenuator. The stable
output signal is amplified again by the BGA3015 amplifier (U3).
C10 provides DC-blocking, followed by L7 for S11 matching of the BGA3015 amplifier
(U3). The feedback of amplifier U2 is provided via R10 & R11 with C11 for DC-blocking
between the input and the output pins of the amplifier. Two resistors are used to lower
the influence of the parasitic capacitance from the circuit board. The output of amplifier
U3 is matched with L10 and C15 provides the DC-blocking towards the output connector
J2.
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4.2 Evaluation board layout
PCB material = FR4
PCB thickness = 1.5 mm
PCB size = 40 mm x 70 mm
εr = 4.6
Copper thickness = 35 μm
Fig 2.
VGA evaluation board layout
For optimum distortion performance it is important to have enough ground vias
underneath and around the MMICs ground pins. This lowers the inductance to the
ground plane. The evaluation board is made with two layer FR4 material.
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4.3 Bill of materials
Table 1.
Evaluation board BoM
Circuit
reference
Description
Qty
U1
BGA3018
1
U2
BAP70Q
U3
C1, C2, C3
Mfr
Manufacturer number
Supplier
Supplier part
number
NXP
BGA3018
NXP
BGA3018
1
NXP
BAP70Q
NXP
BAP70Q
BGA3015
1
NXP
BGA3015
NXP
BGA3015
10 nF
10
Murata
GRM155R71E103KA01D
Digikey
490-1312-1-ND
C4, C13
100 pF
2
Murata
GRM1555C1H101JZ01D
Digikey
490-3458-1-ND
C10
270 pF
1
Murata
GRM1555C1H271JA01D
Digikey
490-1294-1-ND
C5
-
-
-
-
-
-
C6, C7, C8
C9, C11, C12
C15
AN11228
Application note
C14
-
-
-
-
-
-
L1, L10
3.9 nH
2
Murata
LQG15HS3N9S02D
Digikey
490-2617-1-ND
L4
8.2 nH
1
Murata
LQG15HN8N2J02D
Digikey
490-2622-1-ND
L2, L6, L9
Choke
3
Murata
BLM15HD182SN1D
Digikey
490-5196-1-ND
L3, L5, L8
880 nH
3
Murata
LQH31HNR88K03L
Digikey
LQH31HNR88K03
L-ND
L7
0 Ω (Jumper)
1
Yageo
RC0402FR-070RL
Digikey
311-0.0LRCT-ND
R1, R3, R9
470 Ω
3
Yageo
RC0402FR-07470RL
Digikey
311-470LRCT-ND
R2, R10, R11
300 Ω
3
Yageo
RC0402FR-07300RL
Digikey
311-300LRCT-ND
R5, R8
0 Ω (Jumper)
2
Yageo
RC0402FR-070RL
Digikey
311-0.0LRCT-ND
R4, R7
1200 Ω
2
Yageo
RC0402FR-71K2L
Digikey
311-1.20KLRCTND
R6
2200 Ω
1
Yageo
RC0402FR-72K2L
Digikey
311-2.20KLRCTND
J1, J2
75Ω Fconnector
2
Bomar
861V509ER6
Mouser
678-861V509ER6
J3
Header 6
1
Molex
90121-0766
Digikey
WM8112-ND
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BGA301x Wideband Variable Gain Amplifier Application
5. Measurement results at Vcc = 8 V
5.1 S-Parameters
a. S11: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Fig 3.
b. S11: 300 kHz – 200 MHz
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Input matching (S11); Vcc = 8 V
a. S22: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Fig 4.
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
b. S22: 300 kHz – 200 MHz
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
Output matching (S22); Vcc = 8 V
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BGA301x Wideband Variable Gain Amplifier Application
a. S21: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Fig 5.
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
Gain (S21); Vcc = 8 V
a. K-factor: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Fig 6.
b. S21: 300 kHz – 200 MHz
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
b. K-factor: 300 kHz – 200 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29
Vctr = 1.12 V
K-factor; typical; Vcc = 8 V
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BGA301x Wideband Variable Gain Amplifier Application
5.2 Distortion
(1): Vctr = 2.13 V
(3): Vctr = 1.39 V
(2): Vctr = 1.64 V
(4): Vctr = 1.12 V
132 channels NTSC, Vo = 30 dBmV
Fig 7.
Composite triple beat (CTB); Vcc = 8 V
(1):
Vctr = 2.13 V
(3): Vctr = 1.39 V
(2):
Vctr = 1.64 V
(4): Vctr = 1.12 V
132 channels NTSC, Vo = 30 dBmV
Fig 8.
AN11228
Application note
Composite second order (CSO); Vcc = 8 V
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(1):
Vctr = 2.13 V
(3): Vctr = 1.39 V
(2):
Vctr = 1.64 V
(4): Vctr = 1.12 V
132 channels NTSC, Vo = 30 dBmV
Fig 9.
AN11228
Application note
Cross modulation (XMOD); Vcc = 8 V
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5.3 Noise figure
(1):
Vctr = 2.13 V
(5): Vctr = 1.39 V
(2):
Vctr = 1.80 V
(6): Vctr = 1.29 V
(3):
Vctr = 1.64 V
(7): Vctr = 1.12 V
(4):
Vctr = 1.50 V
Fig 10. Noise figure; Vcc = 8 V
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6. Measurement results at Vcc = 5 V
6.1 S-Parameters
a. S11: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
b. S11: 300 kHz – 200 MHz
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
Fig 11. Input matching (S11); Vcc = 5 V
a. S22: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
b. S22: 300 kHz – 200 MHz
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
Fig 12. Output matching (S22); Vcc = 5 V
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a. S21: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
b. S21: 300 kHz – 200 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
Fig 13. Gain (S21); Vcc = 5 V
a. S21: 40 MHz – 1140 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
b. S21: 300 kHz – 200 MHz
(1):
(2):
(3):
(4):
(5):
(6):
(7):
Vctr = 2.13 V
Vctr = 1.80 V
Vctr = 1.64 V
Vctr = 1.50 V
Vctr = 1.39 V
Vctr = 1.29 V
Vctr = 1.12 V
Fig 14. K-factor; typical; Vcc = 5 V
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6.2 Distortion
(1):
Vctr = 2.13 V
(3): Vctr = 1.00 V
(2):
Vctr = 1.15 V
(4): Vctr = 0.84 V
132 channels NTSC , Vo = 30 dBmV
Fig 15. Composite triple beat (CTB); Vcc = 5 V
(1):
Vctr = 2.13 V
(3): Vctr = 1.00 V
(2):
Vctr = 1.15 V
(4): Vctr = 0.84 V
132 channels NTSC , Vo = 30 dBmV
Fig 16. Composite second order (CSO); Vcc = 5 V
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(1):
Vctr = 2.13 V
(3): Vctr = 1.00 V
(2):
Vctr = 1.15 V
(4): Vctr = 0.84 V
132 channels NTSC , Vo = 30 dBmV
Fig 17. Cross modulation (XMOD); Vcc = 5V
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6.3 Noise figure
(1): Vctr = 2.13 V
(2): Vctr = 1.27 V
(3): Vctr = 1.15 V
(4): Vctr = 1.07 V
(5): Vctr = 1.00 V
Fig 18. Noise figure; Vcc = 5 V
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7. Abbreviations
Table 2.
Abbreviations
Acronym
Description
AN11228
Application note
AC
Alternating Current
CATV
Community Antenna Television
DC
Direct Current
ESD
Electro Static Discharge
MMIC
Monolithic Microwave Integrated Circuit
PCB
Printed Circuit Board
RF
Radio Frequency
SMD
Surface Mounted Device
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8. Legal information
8.1 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.
8.2 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
AN11228
Application note
customer product 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 national 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 noninfringement, 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.
8.3 Trademarks
Notice: All referenced brands, product names, service names and
trademarks are property of their respective owners.
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9. List of figures
Fig 1.
Fig 2.
Fig 3.
Fig 4.
Fig 5.
Fig 6.
Fig 7.
Fig 8.
Fig 9.
Fig 10.
Fig 11.
Fig 12.
Fig 13.
Fig 14.
Fig 15.
Fig 16.
Fig 17.
Fig 18.
VGA evaluation circuit....................................... 4
VGA evaluation board layout ............................ 5
Input matching (S11); Vcc = 8 V ....................... 7
Output matching (S22); Vcc = 8 V .................... 7
Gain (S21); Vcc = 8 V ....................................... 8
K-factor; typical; Vcc = 8 V ................................ 8
Composite triple beat (CTB); Vcc = 8 V ............ 9
Composite second order (CSO); Vcc = 8 V ...... 9
Cross modulation (XMOD); Vcc = 8 V............. 10
Noise figure; Vcc = 8 V ................................... 11
Input matching (S11); Vcc = 5 V ..................... 12
Output matching (S22); Vcc = 5 V .................. 12
Gain (S21); Vcc = 5 V ..................................... 13
K-factor; typical; Vcc = 5 V .............................. 13
Composite triple beat (CTB); Vcc = 5 V .......... 14
Composite second order (CSO); Vcc = 5 V .... 14
Cross modulation (XMOD); Vcc = 5V.............. 15
Noise figure; Vcc = 5 V ................................... 16
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10. List of tables
Table 1.
Table 2.
Evaluation board BoM....................................... 6
Abbreviations .................................................. 17
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11. Contents
1.
2.
3.
4.
4.1
4.2
4.3
5.
5.1
5.2
5.3
6.
6.1
6.2
6.3
7.
8.
8.1
8.2
8.3
9.
10.
11.
Introduction ......................................................... 3
System features................................................... 3
Customer evaluation kit contents ...................... 3
Application information ...................................... 4
Evaluation board circuit ...................................... 4
Evaluation board layout...................................... 5
Bill of materials ................................................... 6
Measurement results at Vcc = 8 V...................... 7
S-Parameters ..................................................... 7
Distortion ............................................................ 9
Noise figure ...................................................... 11
Measurement results at Vcc = 5 V.................... 12
S-Parameters ................................................... 12
Distortion .......................................................... 14
Noise figure ...................................................... 16
Abbreviations .................................................... 17
Legal information .............................................. 18
Definitions ........................................................ 18
Disclaimers....................................................... 18
Trademarks ...................................................... 18
List of figures..................................................... 19
List of tables ...................................................... 20
Contents ............................................................. 21
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in the section 'Legal information'.
© NXP B.V. 2014.
All rights reserved.
For more information, visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 3 February 2014
Document identifier: AN11228
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