ar152133 blf188xr 64mhz board #3137€¦ · c25 100 nf murata grm31cr72e104kw03l c26 10 nf tdk...

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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

AR152133Ampleon

Test Report





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





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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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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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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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%

AR152133Ampleon

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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.

AR152133Ampleon

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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


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



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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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

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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.

AR152133Ampleon

Test Report





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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