3SK253 Datasheet, PDF (4/6 Pages) NEC – RF AMPLIFIER FOR UHF TUNER N-CHANNEL Si DUAL GATE MOS FIELD-EFFECT TRANSISTOR 4 PINS MINI MOLD

3SK253
OUTPUT CAPACITANCE vs.
GATE2 TO SOURCE VOLTAGE
2.5
10
ID = 7 mA
(at VDS = 3.5 V,
2.0
VG2S = 3.0 V)
f = 1 MHz
1.5
5
1.0
0.5
0
0
–1.0
0
1.0
2.0
3.0
4.0
VG2S – Gate2 to Source Voltage – V
GPS AND NF TEST CIRCUIT AT f = 900 MHz
VG2S
1 000 pF
POWER GAIN AND NOISE FIGURE vs.
GATE2 TO SOURCE VOLTAGE
20
ID = 7 mA
(at VDS = 3.5 V,
GPS
VG2S = 3.0 V)
f = 900 MHz
10
0
–10
NF
–20
–1.0
0
1.0
2.0
3.0
4.0
VG2S – Gate2 to Source Voltage – V
47 kΩ
1 000 pF
INPUT
50 Ω
to 10 pF
to 10 pF
L1
47 kΩ
to 10 pF
L2
to 10 pF
OUTPUT
50 Ω
RFC
1 000 pF
VG1S
1 000 pF
VDD
L1, L2; 35 × 5 × 0.2 mm
4