Document information
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Author Scott Blum
Author Role Application Engineer
Keywords AR152133, 64MHz, MRI, 1.5T
Abstract This report documents the performance and tune of the BLF188XR for a 1.5T MRI system at 63.86MHz.
Application Measurement Report
AR152133 BLF188XR 64MHz Board #3137
Rev.1.0 —26 June 2015
Test Report
BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
COMPANY CONFIDENTIAL
AR152133 BLF188XR 64MHz Board 3137 © Ampleon 2011. All rights reserved.
Application Report Rev 1.0 —2015-6-26 2 of 13
Revision History
Revision Date Description Author
1.0 2015 June 26 Initial version Scott Blum
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Test Report
BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
COMPANY CONFIDENTIAL
AR152133 BLF188XR 64MHz Board 3137 © Ampleon 2011. All rights reserved.
Application Report Rev 1.0 —2015-6-26 3 of 13
Contents
1. Introduction ................................................ 4 1.1 General Description .............................................................. 4 1.2 Photo ..................................................................................... 4 2. Performance Summary .............................. 5 3. Test Matrix and Spec Targets ................... 6 4. Performance ............................................... 7 5. Layout .......................................................... 8 6. Tuning Areas .............................................. 8 7. Bill of Materials ........................................... 9 8. Copper Baseplate .................................... 10 9. Peak Current Sense Notes ..................... 11 10. Test Setup ............................................ 12 11. Legal information ................................ 13 11.1 Disclaimers .......................................................................... 13 11.2 Trademarks ......................................................................... 13
AR152133Ampleon
Test Report
BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
COMPANY CONFIDENTIAL
AR152133 BLF188XR 64MHz Board 3137 © Ampleon 2011. All rights reserved.
Application Report Rev 1.0 —2015-6-26 4 of 13
1. Introduction
1.1 General Description
This report documents the performance and tune of the BLF188XR for a 1.5T MRI system at 63.86MHz. This is board #3137. The board is designed to achieve high pulse power while achieving a reasonable efficiency.
1.2 Photo
Fig 1. Board Photo
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Test Report
BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
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2. Performance Summary
Pulse Condition: 100mA, 6mS, 8% at 63.86MHz.
Voltage P1dB (dBm / W)
Efficiency at P1dB (%)
Gain at P1dB (dB)
46.5 61.93 / 1559 62.5 25
48 62.14 / 1636 62 25
50 62.31 / 1702 60 25
51 62.35 / 1717 59 25.1
52 62.39 / 1734 58 25.1
54 62.36 / 1722 55 25.2
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Test Report
BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
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3. Test Matrix and Spec Targets
Pulse Condition: 6mS, 8% at 63.86MHz
Voltage supply: 46.5V, 48V, 50V, 51, 52, 54V
P1dB goal: 1400W with 1500W target
Efficiency goal: greater than 60%. Power is more important
IDQ: 100mA
Dynamic range: As broad as test setup accurately allows
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Test Report
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4. Performance
0
10
20
30
40
50
60
70
80
90
100
17
18
19
20
21
22
23
24
25
26
27
0 200 400 600 800 1000 1200 1400 1600 1800
Efficiency
(%)
Gain (dB)
Output Power (Wa�s)
46.5V 48V 50V 51V 52V 54V
46.5V 48V 50V 51V 52V 54V
BLF188XR Board 3137 Frequency: 63.86 MHz6000uS, 8%, 100mA
EFF
Gain
Fig 2. Gain and Efficiency as a function of Output Power with varying Drain Voltage – 6mS, 8%
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Test Report
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5. Layout
Fig 3. Layout (see Autocad attachment)
6. Tuning Areas
The strongest tuning areas are the locations near the output transformer and the shunt capacitors near the output connector. These are the C13, C14, C18, and C19 components. In general, more power can be obtained by adding capacitance in the C18 and C19 areas. It is harder than expected to gain
more efficiency by lowering C18 and C19, however. There is also a slight increase in power and efficiency when making the input cap C7 a little higher, up to 390pF. The 300pF was used in order to keep the values the same as for board #3138 as reported in CA-112-15.
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Test Report
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7. Bill of Materials
Component Descrip�on Value Remarks
A1 LDMOS bias module Ampleon per CA-330-11
Input PCB Input PCB 30 mil thk. RF35 Ohio Circuits BLF178XR Planar Input-Rev.01
Output PCB Output PCB 30 mil thk. RF35 Ohio Circuits BLF178XR Planar Output-Rev.01
Q1 2N2222 NPN Transistor Fairchild MMBT2222
Q2 BLF188XR Ampleon BLF188XR
C1 56 pF Passive Plus 1111N
C2 10 uF Murata GRM32DF51H106ZA01L
C3 1 uF Murata GRM31CR72A105KA01L
C4 100 nF Mul�comp S0805W104K1HRN-P4
C5 10nF Mul�comp U0805R103KCT
C6, C20, C21, C27 1000 pF Passive Plus 1111N
C7 300 pF Passive Plus 1111N
C8,C10 100nF AVX 12101C104KAT2A
C9,C11 10 nF TDK C3225C0G2E103J
C12, C13 39 pF Passive Plus 1111N
C14 47 pF MICA Cornell
Dubilier CDE MIN02-002E470J
C15 150 pF MICA CDE cap MIN02-002E151J
C16, C17 470 uF Electroly�c Panasonic PCE3667CT-ND
C18 51 pF Passive Plus 1111N
C19 75 pF Passive Plus 1111N
C22 10uF TDK C5750X7R1H106M
C23 2.2 uF Murata GRM32ER72A225KA35L
C24 1uF Murata GRM31CR72A105KA01L
C25 100 nF Murata GRM31CR72E104KW03L
C26 10 nF TDK C3225C0G2E103J
R1,R2 Resistor, 5% 75W AlN, 2010 20 Ohms IMS NDC-2010WA200J
R3 Resistor, 1% 100ppm MF, 2W, 3008 0.005 Ohms Susumu RL7520WT-R005-F
PCB Taconic RF35-TC Er = 3.5, 30 mils thick, 1oz
M1, Thermal pad 0.2” Chomerix Therm-a-gap 976 61-20-0404-976
Figure 6. BLF188XR Board 3137 Material List
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8. Copper Baseplate
0.2
56
0.0
00
0.1
38
0.1
38
0.472
0.000
1.326
1.666
2.992
0.250 Ø 3.750 deep5/16-18 UNC 0.700 deep
CB 0.343 Ø 0.200 deep
0.0000.256 0.046
2.4
41
3.5
43
2X 0.250 Ø 2.520 deep1/8" NPT 0.250 deep
1.326
1.666
0.9000
2.1000
0.6
033
0.8208
1.9
97
42.1903
4.6
70
8
3.8
15
8
5.5
76
2
0.0
00
0.1
18
0.3
00
2.2
05
2.6
77
2.9
92
3.3
07
4.0
94
5.9
84
5.8
66
0.118
2.300
2.874
2.224
0.768
2.854
0.138
1.496
0.700
16X M2 THD 8mm deep 2X 0.140 THRU
2X M3 THD 8mm deep
0.063 THRU
0.4
65
0.0
00 5.7
01
7
1.2095
1.4260
2.2300
2.7
83
5
3.2
00
8
0.4
65
0
0.46500
.00
00
5.9
84
2
0.7800
4X M2.5 THD 8mm deep
Fig 4. Baseplate Dimensional Drawing (see Autocad attachment)
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BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
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AR152133 BLF188XR 64MHz Board 3137 © Ampleon 2011. All rights reserved.
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9. Peak Current Sense Notes
In order to accurately measure the pulsed efficiency, peak current needs to be measured during the pulse. This is accomplished using an Agilent 34411A DMM. The voltage drop is measured over a
precision 5mOhm resistor, and V/R calculations are done to calculate the current. The drain bias trace includes a series resistor with pins around the resistor to enable this measurement. A cut was made, and the resistor was inserted in between the electrolytic capacitors and the ceramic capacitors. This is
in between C17 and C22 in the layout shown earlier.
Fig 5. Details of changes to allow for peak current measurements
AR152133Ampleon
Test Report
BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
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AR152133 BLF188XR 64MHz Board 3137 © Ampleon 2011. All rights reserved.
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10. Test Setup
Signal GeneratorESG4438C Agilent Power Meter
E4417A
Spectrum AnalyzerRhode & Schwarz FSV
DUT
DriverAmplifier
Network AnalyzerHP8753ES
2xN5767A Drain supplyMaster and Slave
2 x 0.2F caps
termination
Load: 30dB1kW
AeroflexSN:RQ792
Power SensorE9323A
Mini-circuits splitter
ZFSC-3-4-N+
Mini-Circuits SplitterZAPD-2-252-N+
Werlatone Bi-Directional Coupler
C8356-10
Power SensorE9323A
SpinnerSwitch
10dBpad
Agilent DMM34411A
Read voltage over5 mOhm sense resistor
LF Out isTrigger
Fig 6. Test Setup
The pulse is set for 6mS, 8% on the signal generator. The signal generator LF Output provides the triggering signal for the peak power meter and the DMM. The automation code allows for a flexible
setting of the measurement aperture for current and power readings. These were set to be 5 mS windows, so that almost the entire signal was integrated, while not measuring the pulses during the rise and fall times, which would hurt the accuracy.
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BLF188XR 64MHz Board #3137Application Support Smithfield Project Name: BLF188XR
COMPANY CONFIDENTIAL
AR152133 BLF188XR 64MHz Board 3137 © Ampleon 2011. All rights reserved.
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11. Legal information
11.1 Disclaimers
General
Information in this document is believed to be accurate and reliable. However, Ampleon does not give any representat ions 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.
Right to make changes
Ampleon reserves the right to make changes to inform ation 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
Ampleon products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, sp ace or life support
equipment, nor in applications where failure or malfunction of an Ampleon product can reasonably be expected to resu lt in personal
injury, death or severe property or environmental damage. Ampleon accepts no liability for inclusion and/or use of N XP
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. Ampleon makes no representation or
warranty that such applications will be suitable for the specified use without further testing or modification.
Terms and conditions of sale
Ampleon products are sold subject to the general terms and conditions of commercial sale, as published at
HTUhttp://www.Ampleon.com/profile/terms,UTHTU including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by Ampleon. In case of any inconsistency or conflict between information i n this document and
such terms and conditions, the latter will prevail.
No offer to sell or license
Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or
implication of any license under any copyrights, patents or other industrial or intellectual property rights.
Terms and conditions of sale
Ampleon products are sold subject to the general terms and conditions of commercial sale, as published at
HTUhttp://www.Ampleon.com/profile/terms,UTHTU including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by Ampleon. In case of any inconsistency or conflict between information i n this document and
such terms and conditions, the latter will prevail. UT
11.2 Trademarks
Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners.
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