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BF998 Schematic ( PDF Datasheet ) - Vishay Telefunken

Teilenummer BF998
Beschreibung N-Channel Dual Gate MOS-Fieldeffect Tetrode/ Depletion Mode
Hersteller Vishay Telefunken
Logo Vishay Telefunken Logo 




Gesamt 9 Seiten
BF998 Datasheet, Funktion
BF998/BF998R/BF998RW
Vishay Telefunken
N–Channel Dual Gate MOS-Fieldeffect Tetrode,
Depletion Mode
Electrostatic sensitive device.
Observe precautions for handling.
Applications
Input and mixer stages in UHF tuners.
Features
D Integrated gate protection diodes
D Low noise figure
D Low feedback capacitance
D High cross modulation performance
D Low input capacitance
D High AGC-range
D High gain
21
12
94 9279
13 579
34
BF998 Marking: MO
Plastic case (SOT 143)
1 = Source, 2 = Drain, 3 = Gate 2, 4 = Gate 1
12
94 9278
43
95 10831
BF998R Marking: MOR
Plastic case (SOT 143R)
1 = Source, 2 = Drain, 3 = Gate 2, 4 = Gate 1
13 654
13 566
43
BF998RW Marking: WMO
Plastic case (SOT 343R)
1 = Source, 2 = Drain, 3 = Gate 2, 4 = Gate 1
Document Number 85011
Rev. 4, 23-Jun-99
www.vishay.de FaxBack +1-408-970-5600
1 (9)






BF998 Datasheet, Funktion
BF998/BF998R/BF998RW
Vishay Telefunken
WVDS = 8 V, ID = 10 mA, VG2S = 4 V , Z0 = 50
S11
j0.5
j
j2
j0.2 j5
0 ÁÁÁÁ0.2ÁÁÁÁ0.5 ÁÁÁÁ1 ÁÁÁÁ2 ÁÁ5ÁÁ100 1
–j0.2
1300MHz
1000
–j5
–j0.5
–j2
12 960
–j
S21
Figure 12. Input reflection coefficient
120°
400
150°
100
180°
90°
700
60°
1000
1300MHz
30°
1 2 0°
–150°
–30°
12 962
–120°
–60°
–90°
Figure 13. Forward transmission coefficient
S12
90°
120°
60°
150°
1300MHz
1200
180°
200
100
0.08
30°
0.16 0°
–150°
–30°
12 973
–120°
–60°
–90°
Figure 14. Reverse transmission coefficient
S22
j
j0.5 j2
j0.2 j5
0 ÁÁ0.2ÁÁÁÁ0.5ÁÁÁÁ1 ÁÁÁÁ2 ÁÁÁÁ5 100 1
–j0.2
–j5
–j0.5
1300MHz
–j2
12 963
–j
Figure 15. Output reflection coefficient
www.vishay.de FaxBack +1-408-970-5600
6 (9)
Document Number 85011
Rev. 4, 23-Jun-99

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