3SK255 Datasheet, PDF (4/8 Pages) NEC – RF AMPLIFIER FOR UHF TUNER N-CHANNEL Si DUAL GATE MOS FIELD-EFFECT TRANSISTOR 4 PINS SUPER MINI MOLD

3SK255
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
S-Parameter
VDS = 3.5 V, VG2S = 3 V, ID = 7 mA
Frequency
(MHz)
100
200
300
400
500
600
700
800
900
1000
S11
MAG
ANG
1.017
–6.5
1.000
–13.4
0.999
–19.8
0.993
–26.6
0.984
–32.6
0.966
–39.1
0.948
–45.5
0.934
–51.4
0.908
–57.5
0.901
–83.8
S21
MAG
ANG
2.057
173.3
2.034
163.6
1.991
155.5
1.996
146.8
1.956
136.7
1.930
130.4
1.901
122.7
1.897
114.5
1.897
105.6
1.984
96.6
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
S12
MAG
ANG
0.035
–88.2
0.014 –121.6
0.006
67.0
0.006
71.3
0.005
117.8
0.002
–23.3
0.002 –162.4
0.003
37.8
0.011 –146.3
0.010 –144.3
S22
MAG
ANG
0.985
–2.9
0.987
–6.9
0.988
–10.4
0.983
–13.8
0.985
–17.1
0.983
–20.8
0.979
–24.6
0.986
–27.9
0.991
–32.1
1.024
–36.4
4