J308 Datasheet, PDF (6/7 Pages) ON Semiconductor – JFET VHF/UHF Amplifiers

J/SST/U308 Series
Vishay Siliconix
TYPICAL CHARACTERISTICS (T_A = 25_C UNLESS OTHERWISE NOTED)
On-Resistance vs. Drain Current
100
80
Circuit Voltage Gain vs. Drain Current
100
g_fs R_L
A_V + _{1 ) RLgos}
80
Assume V_DD = 15 V, V_DS = 5 V
V_GS(off) = –1.5 V
60
60
R_L
+
10 V
I_D
40
V_GS(off) = –3 V
20
0
1
10
100
I_D – Drain Current (mA)
Common-Source Input Capacitance
vs. Gate-Source Voltage
15
f = 1 MHz
12
V_DS = 0 V
9
6
40
V_GS(off) = –1.5 V
20
V_GS(off) = –3 V
0
0.1
1
10
I_D – Drain Current (mA)
Common-Source Reverse Feedback Capacitance
vs. Gate-Source Voltage
10
f = 1 MHz
8
6
V_DS = 0 V
4
3
V_DS = 5 V
0
0
100
–4
–8
–12
–16
–20
V_GS – Gate-Source Voltage (V)
Input Admittance vs. Frequency
2
V_DS = 5 V
0
0
–4
–8
–12
–16
–20
V_GS – Gate-Source Voltage (V)
Forward Admittance vs. Frequency
100
g_ig
10
b_ig
1
T_A = 25_C
V_DG = 10 V
I_D = 10 mA
Common–Gate
0.1
100
200
500
f – Frequency (MHz)
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7-6
1000
–g_fg
10
b_fg
1
T_A = 25_C
V_DG = 10 V
I_D = 10 mA
Common–Gate
0.1
100
200
500
f – Frequency (MHz)
1000
Document Number: 70237
S-04028—Rev. G, 04-Jun-01