2.5.5
Digital broadcasting at its best
The BLF881 / BLF888A transistor line-up enables today’s most powerful and
efficient digital broadcast transmitter applications
This transistor is based on NXP’s 50 V LDMOS technology and
features 120 W RF output power for broadcast transmitter and
industrial applications. An unmatched device, the BLF881 can be
used in the HF to 1 GHz range. The excellent ruggedness and
broadband performance of this device make it ideal for digital
transmitter applications – either on its own or as a driver in
combination with the high-power transistor BLF888A.
The BLF881 is also available in an earless version, the BLF881S,
which enables an even more compact PCB design.
Running from a 50 V supply voltage, the BLF888A is a
600 W LDMOS RF power transistor for broadcast transmitter
and industrial applications. Being a matched device, the
can deliver 120 W average DVB-T output power over the full
UHF band from 470 MHz to 860 MHz with 20 dB power gain
and 31% drain efficiency. The excellent ruggedness of this
transistor (it withstands a VSWR in excess of 40:1) makes it the
ultimate choice as final stage for digital transmitter applications
– ideally accompanied by a BLF881 as the driver. This device
is also available in an earless package, denoted BLF888AS, to
enable surface-mount assembly processes and take optimum
advantage of the very low thermal resistance of the package.
Key features and benefits
`
Excellent efficiency and reliability
`
Highest power levels in the market
`
Best-in-class ruggedness designed into all devices
`
Best broadband performance
`
Easy power control
`
Best-in-class design support
`
Low thermal resistance design for unrivalled reliability
`
Advanced flange material for optimum thermal behavior
and reliability
`
Designed for broadband operation (470 to 860 MHz)
Key applications
`
Analog and digital TV transmitters
typ. 0.5 kW
DVB-T
Driver stages
8× final
typ. 5 kW DVB-T
output power
TV exciter
DVB-T
harmonic
filter power
monitor
amplifiers
brb339
Type
Product
Driver
f
min
(MHz)
1
470
470
470
470
1
f
max
(MHz)
1400
860
860
860
860
1000
P1dB (W)
35
300
500
600
600
140
Matching
-
I
I
I
I
-
VDS (V)
32
50
42
50
50
50
P
L
(W)
35
150
200
250
250
140
η
D
(%)
63
46
47
46
46
49
G
p
(dB)
19
21
21
21
21
21
Test signal
CW
CW
CW
CW
CW
CW
Package
Final
68
NXP Semiconductors RF Manual 16
th
edition
PHILIPS [ NXP SEMICONDUCTORS ]
