BF998A Vishay Telefunken, BF998A Datasheet - Page 5

• Manufacturer Part Number: BF998A
• Description: N-Channel Dual Gate MOS-Fieldeffect Tetrode/ Depletion Mode
• Manufacturer: Vishay Telefunken

Document Number 85011
Rev. 4, 23-Jun-99
Figure 7. Transducer Gain vs. Gate 1 Source Voltage
Figure 8. Forward Transadmittance vs. Drain Current
12818
12819
12820
–10
–20
–30
–40
–50
20
18
16
14
12
10
10
32
28
24
20
16
12
8
6
4
2
0
Figure 9. Short Circuit Input Admittance
0
8
4
0
–1
0
0
f= 800MHz
V
f=1MHz
100MHz
DS
4
2
0
V
400MHz
–0.5
=8V
G1S
I
700MHz
D
8
4
– Gate 1 Source Voltage ( V )
– Drain Current ( mA )
Re (y
0.0
12
6
f=1300MHz
11
1000MHz
1V
) ( mS )
16
f=100...1300MHz
8
0.5
V
I
V
D
G2S
DS
=10mA
20
10
V
G2S
=8V
V
=4V
1.0
G2S
=–0.8V
24
12
–0.4V
–0.2V
=4V
2V
3V
4V
3V
1V
2V
0
1.5
28
14
Figure 10. Short Circuit Forward Transfer Admittance
12821
12822
BF998/BF998R/BF998RW
–10
–15
–20
–25
–30
–35
–40
Figure 11. Short Circuit Output Admittance
–5
5
0
9
8
7
6
5
4
3
2
1
0
0
0
f=100...1300MHz
20mA
4
100MHz
0.25
V
V
G2S
DS
www.vishay.de FaxBack [phone]
10mA
8
=8V
I
400MHz
=4V
1300MHz
D
0.50
=5mA
f=1300MHz
12
Re (y
Re (y
Vishay Telefunken
700MHz
0.75
21
22
16
) ( mS )
) ( mS )
1000MHz
f=100...1300MHz
20
1000MHz
1.00
V
I
V
D
DS
G2S
=10mA
f=100MHz
24
=15V
=4V
700MHz
400MHz
1.25
28
1.50
32
5 (9)