AN10714_1
© NXP B.V. 2010. All rights reserved.
Application note
Rev. 01 — 26 January 2010
11 of 21
NXP Semiconductors
AN10714
Using the BLF574 in the 88 MHz to 108 MHz FM band
4.
RF performance characteristics
4.1 Continuous wave
4.2 Continuous wave graphics
shows the difference in gain and efficiency depending on the drain voltage
conditions.
Table 2.
Class-B performance of the BLF574 at 50 V/600 W
This table summarizes the Class-B performance of the BLF574 at 50 V, I
Dq
= 200 mA and
T
h
= 25
°
C.
Frequency (MHz)
P
L
(W)
G
p
(dB)
η
(%)
RL (dB)
88
600
24.8
73.3
7.5
98
600
25.3
73.5
9
108
600
25.6
71.9
11.5
V
DD
= 50 V; I
Dq
= 200 mA.
(1) 88 MHz.
(2) 98 MHz.
(3) 108 MHz.
Fig 6.
Typical CW data; 88 MHz to 108 MHz
P
L
(W)
0
800
600
400
200
001aal308
24
20
28
32
G
P
(dB)
16
40
20
60
80
η
D
(%)
0
G
P
η
D
(1)
(2)
(3)
(1)
(2)
(3)
