40

30

20

10

0

0

60

120

180

240

300

300

240

180

120

60

0

Freq. (MHz)

2.0

13.5

27.0

40.0

65.0

56.00 - j 06.0

37.00 - j 26.0

18.00 - j 25.0

9.90 - j 19.2

4.35 - j 11.4

20.90 - j 9.2

2.40 - j 6.8

0.57 - j 2.6

0.31 - j 0.5

Figure 8, Typical Common Source Amplifier Gain vs Power Out

17

16

15

14

13

Figure 5, Typical Threshold Voltage vs Temperature

1.2

1.1

1.0

0.9

0.8

0.7

0.6

-50 -25

0

25

50

75 100 125 150

0

2

4

6

8

10

1

5

10

15

20

25

30

Figure 7, Typical Power Out vs Power In

Figure 6, Typical Output Characteristics

ARF448A/448B

5.5V

4.5V

5V

6V

VGS=8, 10 & 15V

1.0

10

RECTANGULAR PULSE DURATION (SECONDS)

Figure 9, Typical Maximum Effective Transient Thermal Impedance, Junction-To-Case vs Pulse Duration

Class C

V

f = 40.68 MHz

Table 1 - Typical Class C Large Signal Input-Output Impedance

Class C

V

f = 40.68 MHz

6.5V

0.6

0.1

0.05

0.01

0.005

0.001

Note:

Duty Factor D = t1/t2

Peak TJ = PDM x ZqJC + TC

t1

t2

0.1

SINGLE PULSE

0.02

0.05

0.2

D=0.5

0.01