3SK254 Datasheet, PDF (5/6 Pages) NEC – RF AMPLIFIER FOR CATV TUNER N-CHANNEL Si DUAL GATE MOS FIELD-EFFECT TRANSISTOR 4 PINS SUPER MINI MOLD

3SK254
GPS AND NF TEST CIRCUIT AT f = 470 MHz
VG2S
1 000 pF
22 kΩ
1 000 pF
Ferrite Beads
INPUT 40 pF
50 Ω
L1
1 000 pF
15 pF
22 kΩ
15 pF
40 pF OUTPUT
L2
50 Ω
1 000 pF
L3
1 000 pF
1 000 pF
VG1S
NF TEST CIRCUIT AT f = 55 MHz
VDS
L1: φ1.2 mm U.E.W ^φ 5 mm 1T
L2: φ1.2 mm U.E.W φ 5 mm 1T
L3: REC 2.2 µ H
INPUT
50 Ω
VG2S
VDS
1 500 pF
2.2 kΩ
1 000 pF
RFC
Ferrite Beads
1 500 pF
3.3
kΩ
27 pF ₄₇
kΩ
47 kΩ
1 000 pF
27 pF
3.3 kΩ
OUTPUT
50 Ω
VG1S
5