Communication Concepts FM-1KW Broadcast Application Note - Manual (Page 2)

2
RF Reference Design Data
Freescale Semiconductor
MRFE6VP61K25H MRFE6VP61K25HS FM Broadcast
MEASUREMENTS
24
31
100
29
27
P
out
, OUTPUT POWER (WATTS)
Figure 2. Continuous Wave Performance Graph
with Low Pass Filter versus Output Power
25
200 400 600 800 900 1000
G
ps
,P
OWER
GAIN
(d
B) f = 108 MHz
Air--Cooled, CW, 87.5--108 MHz, Low Pass Filter
30
28
26
η
D,
DRA
IN
EF
FI
CIE
NCY
(%
)
90
70
60
50
40
30
20
80
1200
98 MHz
87.5 MHz
108 MHz
98 MHz
87.5 MHz
300 500 700 1100
V
DD
= 50 V
I
DQ
= 200 mA
20
32
86
24
f, FREQUENCY (MHz)
Figure 3. Continuous Wave Performance Graph
with Low Pass Filter versus Frequency
88 92 96 100 102 104
G
ps
,P
OWER
GAIN
(d
B)
30
28
22
η
D,
DRA
IN
EF
FI
CIE
NCY
(%
)
90
70
60
50
40
30
80
110 90 94 98 106
P
out
= 1100 W
V
DD
= 50 V
I
DQ
= 200 mA
G
ps
η D
26
108
G
ps
η D
Air--Cooled, CW, 87.5--108 MHz, Low Pass Filter
Table 1. CW Drive--Up at 87.5 MHz
P
in
(W)
P
out
(W)
Gain
(dB)
IRL
(dB)
Eff
(%)
V
DD
(V)
I
DD
(A)
I
DQ
(1)
(A)
0.3 150 27.0 --6.1 33.6 50 8.9 0.2
0.5 314 28.0 --6.5 48.0 50 13.1 0.2
1.0 639 28.1 --8.1 65.8 50 19.4 0.2
1.5 844 27.5 --10.1 72.6 50 23.2 0.2
2.0 975 26.9 --11.9 76.1 50 25.6 0.2
2.5 1056 26.3 --13.0 78.1 50 27.0 0.2
3.0 1100 25.6 --13.3 79.1 50 27.8 0.2
3.5 1116 25.0 --13.6 79.2 50 28.2 0.2
Table 2. CW Drive--Up at 98 MHz
P
in
(W)
P
out
(W)
Gain
(dB)
IRL
(dB)
Eff
(%)
V
DD
(V)
I
DD
(A)
I
DQ
(1)
(A)
0.3 168 27.5 --11.0 36.8 50 9.1 0.2
0.5 343 28.4 --11.8 52.0 50 13.2 0.2
1.0 660 28.2 --14.9 68.5 50 19.3 0.2
1.5 864 27.6 --19.4 75.3 50 22.9 0.2
2.0 999 27.0 --22.4 78.7 50 25.4 0.2
2.5 1058 26.3 --22.0 80.1 50 26.4 0.2
3.0 1085 25.6 --22.0 80.2 50 27.0 0.2
3.5 1094 24.9 --22.6 80.4 50 27.2 0.2
Table 3. CW Drive--Up at 108 MHz
P
in
(W)
P
out
(W)
Gain
(dB)
IRL
(dB)
Eff
(%)
V
DD
(V)
I
DD
(A)
I
DQ
(1)
(A)
0.3 193 28.1 --14.2 40.9 50 9.4 0.2
0.5 377 28.8 --14.9 56.1 50 13.4 0.2
1.0 695 28.4 --15.6 72.9 50 19.1 0.2
1.5 881 27.7 --13.5 78.6 50 22.4 0.2
2.0 980 26.7 --14.1 79.2 50 22.9 0.2
2.5 1018 26.1 --12.2 81.6 50 24.9 0.2
3.0 1066 25.5 --11.8 82.4 50 25.9 0.2
3.5 1092 24.9 --11.8 82.7 50 26.4 0.2
1. I
DQ
is set by adjusting a variable gate--source voltage while maintaining a constant 50 volts at the drain.