Communication Concepts FM-1KW Broadcast Application Note - Manual

MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast
1
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 signaling as a result of their high efficiency 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
DD
= 50 volts
and I
DQ
= 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, 6/2011
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
RF
OUTPUT RF
INPUT
M
V
DD
V
GG
BIAS
-
+
+
-
V
DD
V
GG
M
M
M
BIAS
BIAS
BIAS
M = Match
© Freescale Semiconductor, Inc., 2011. All rights reserved.