D1040UK Datasheet, PDF (3/5 Pages) Seme LAB – METAL GATE RF SILICON FET

D1040UK
600
500
400
300
Class C 32V
Class A/B 32V
200
Class C 28V
Class A/B 28V
100
f = 108MHz
0
0
2
4
6
8 10 12 14 16
Pin (W)
Figure 1
Output Power vs. Input Power
23
22
21
20
19
Class C 32V
18
Class A/B 32V
17
Class C 28V
Class A/B 28V
16
f = 108MHz
15
0 50 100 150 200 250 300 350 400 450 500 550
Pout (W)
Figure 2
Gain vs. Output Power
90
80
70
60
OPTIMUM SOURCE AND LOAD IMPEDANCE
50
Class C 32V
40
Class A/B 32V
Frequency
Z_S
Z_L
30
Class C 28V
Class A/B 28V
MHz
W
W
20
f = 108MHz
108
1.5 + j3.5 1.5 - j0.4
10
0
0
100
200
300
400
500
600
Pout (W)
Figure 3
Efficiency vs. Output Power
APPLICATION NOTE
In applications where a constant output power is required irrespective of variations in temperature or
supply voltage etc. then a feedback loop must be incorporated whereby the drain voltage is adjusted
to maintain constant output power.
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed
to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.
Semelab encourages customers to verify that datasheets are current before placing orders.
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Document Number 5460
Issue 3