Communication-concepts FM-1KW Broadcast Application Note User Manual download pdf

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast

RF Reference Design Data

Freescale Semiconductor

RF Power Reference Design Library

FM Broadcast Reference Design

High Ruggedness N--Channel Enhancement--Mode

Lateral MOSFETs

Reference Design Characteristics

The MRFE6VP61K25H/HS are versatile devices and are well suited for a

wide range of applications . They are capable of delivering 1.2 kW under

continuous wave test s ignaling as a result of their high efficienc y and low

thermal resistance. This document focuses on FM broadcast radio applications

for both analog and complex modulation waveforms.

 Frequency Band: 87.5--108 MHz

 Output Power: 1100 Watts CW

 Supply Voltage: 50 Vdc

 Power Gain (Typ): 25 dB

 Drain Efficiency (Min): 79% (at fundamental frequency)

The MRFE6VP61K25H/HS products are enhanced ruggedness 50 volt

LDMOS power transistors that can operate in harsh environments and in highly

mismatched applications (within the limit of maximum junction temperature).

These parts are designed for high voltage operation and are fabricated using

Freescale’s very high voltage 6th generation (VHV6E) platform.

FM BROADCAST REFERENCE DESIGN

This reference design is designed to demonstrate the RF

performance characteristics of the MRFE6VP61K25H/HS

devices when applied to the 87.5--108 MHz FM broadcast

frequency band. The reference design is tuned for

performance at 1100 watts CW output power , V

=50volts

and I

= 200 mA.

REFERENCE DESIGN LIBRARY TERMS

AND CONDITIONS

Freescale is pleased to make this reference design

available for your use in development and testing of your

own product or products. The reference design contains an

easy--to--copy, fully functional amplifier design. It consists of

“no tune” distributed element matching circuits designed to

be as small as possible, and is designed to be used as a

“building block” by our customers.

HEATSINKING

When operating this fixture it is critical that adequate heat-

sinking is provided for the device. Excessive heating of the

device may prevent duplication of the included measurements

and/or destruction of the device.

Figure 1. FM Broadcast Reference Design Fixture

Available at http://www.freescale.com. Go to Support/Software & Tools/

Additional Resources/Reference Designs/Networking

Rev. 1.1, 6/201 1

Freescale Semiconductor

Technical Data

 REFERENCE DESIGN IN 1st REVIEW -- 06/03/11

MRFE6VP61K25H

MRFE6VP61K25HS

FM Broadcast

87.5--108 MHz, 1100 W CW, 50 V

FM BROADCAST

REFERENCE DESIGN

OUTPUT

INPUT

BIAS

M=Match

 Freescale Semiconductor, Inc., 2011.

ll rights reserved.

1 2 3 4 5 6 ... 13 14

Summary of Contents

Page 1 - FM Broadcast Reference Design

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast1RF Reference Design DataFreescale SemiconductorRF Power Reference Design LibraryFM Broadcast Reference Desig

Page 2 - MEASUREMENTS

10RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastAPPENDIX BMounting TipsThe MRFE6VP61K25H/HS is packaged in t

Page 3 - AMPLIFIER DESIGN

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast11RF Reference Design DataFreescale SemiconductorAPPENDIX CRF Bench Setup/Continuous Wave Performance (CW)Fig

Page 4 - CIRCUIT DESCRIPTION

12RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastAPPENDIX DCopper Heatsink for FM Broadcast FixtureA2.737 (69

Page 5

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast13RF Reference Design DataFreescale SemiconductorREVISION HISTORYThe following table summarizes revisions to

Page 6 - Extended Gate Voltage Range

14RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastInformation in this document is provided solely to enable sy

Page 7

2RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastMEASUREMENTS24311002927Pout, OUTPUT POWER (WATTS)Figure 2. Co

Page 8 - THERMAL MEASUREMENTS

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast3RF Reference Design DataFreescale SemiconductorAMPLIFIER DESIGNMATCHING NETWORKAs a first order approximatio

Page 9 - Tuning Tips

4RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastCIRCUIT DESCRIPTIONB2VDDFigure 6. FM Broadcast Reference Desi

Page 10 - Mounting Tips

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast5RF Reference Design DataFreescale SemiconductorFigure 7. FM Broadcast Reference Design Component Layout++++C

Page 11 - APPENDIX C

6RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastFREESCALE RF POWER 50 V TECHNICAL ADVANTAGES50 V Drain Voltag

Page 12 - APPENDIX D

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast7RF Reference Design DataFreescale SemiconductorFigure 10 shows the internal diagram of the ITC55100Btester.

Page 13 - REVISION HISTORY

8RF Reference Design DataFreescale SemiconductorMRFE6VP61K25H MRFE6VP61K25HS FM BroadcastReliabilityMean time to failure (MTTF) is defined as a 10% re

Page 14 - How to Reach Us:

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast9RF Reference Design DataFreescale SemiconductorAPPENDIX ATuning Tips Increasing C4 increases efficiency at

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Communication-concepts FM-1KW Broadcast Application Note User Manual

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