Communication Concepts AN758 - Manual (Page 13)

AR
C
HIVE INF
O
RMA
TI
O
N
PRODUCT TRANSFERRED T
O
M/A
–
COM
AN758
13 RF Application Reports
HEA
T SINK
TEMPERA
TURE ( C)
90
80
70
60
50
40
30
20
°
1.0 10 100 1000
P
out
= 1000 W CW
V
CC
= 40 V
η = 58%
TIME (MINUTES)
Figure 21. Heat Sink Temperature versus Time
FREQUENCY (MHz)
30 20 15 10 1.5 2.0 3.0 5.0 7.0
- 10
- 30
- 40
- 20
- 50
- 60
HARMONICS BELOW FUNDAMENT
AL
(dB)
FUNDAMENTAL = 1000 W CW
V
CC
= 50 V
3RD
5TH
2ND
4TH
Figure 22. Output Harmonic Contents versus
Frequency
0.5 µH
1.0 µH
Figure 23. Load Mismatch Test Circuit
NOTE: Not to scale.
Figure 24. Circuit Board Layout of the Power Combiner Assembly