J308_06 Datasheet, PDF (4/6 Pages) ON Semiconductor – JFET VHF/UHF Amplifiers

30
3.0
24 ^{VDS = 10 V}
I_D = 10 mA
T_A = 25°C
18
2.4
Y₁₁
1.8
12
Y₂₁
1.2
6.0
Y₂₂
0.6
Y₁₂
0
100
200 300
500 700 1000
f, FREQUENCY (MHz)
Figure 6. Common−Gate Y Parameter
Magnitude versus Frequency
J308
|S₂₁|, |S₁₁|
0.85 0.45
|S₁₂|, |S₂₂|
0.060 1.00
0.79 0.39
0.73 0.33
0.67 0.27
V_DS = 10 V
I_D = 10 mA
T_A = 25°C
S₂₂
S₂₁
0.048 0.98
0.036 0.96
0.024 0.94
S₁₁
0.61 0.21
0.012 0.92
0.55 0.15
100
S₁₂
0.90
200 300
500 700 1000
f, FREQUENCY (MHz)
Figure 7. Common−Gate S Parameter
Magnitude versus Frequency
θ₂₁, θ₁₁
180° 50°
170° 40°
160° 30°
150° 20°
140° 10°
130° 0°
100
θ₁₂, θ₂₂
−2 0° 87°
θ₂₂
−20 °
−40 ° 86°
θ₂₁
−60 °
−80 ° 85°
−100 °
θ₁₂
−120 ° 84°
θ₁₁
V_DS = 10 V
−140 °
−160 ° 83°
I_D = 10 mA
T_A = 25°C
−180 °
200 300
−200 ° 82°
500 700 1000
f, FREQUENCY (MHz)
Figure 8. Common−Gate Y Parameter
Phase−Angle versus Frequency
θ₁₁, θ₁₂
−20 ° 120°
θ₁₁
−40 ° 100° ^θ21
θ₂₂
−60 ° 80°
θ₂₁, θ₂₂
0
−20 °
−40 °
−80 ° 60°
θ₁₂
−100 ° 40°
−120 ° 20°
100
θ₂₁ −60 °
V_DS = 10 V
I_D = 10 mA
θ₁₁
T_A = 25°C
200 300 500 700
f, FREQUENCY (MHz)
−80 °
−100 °
1000
Figure 9. S Parameter Phase−Angle
versus Frequency
8.0
24
7.0 ^{VDD = 20 V}
21
f = 450 MHz
6.0 ^{BW ≈ 10 MHz}
18
CIRCUIT IN FIGURE 1
5.0
15
G_pg
4.0
12
NF
3.0
9.0
2.0
6.0
1.0
3.0
0
0
4.0 6.0 8.0 10 12 14 16 18 20 22 24
I_D, DRAIN CURRENT (mA)
Figure 10. Noise Figure and
Power Gain versus Drain Current
7.0
6.0
5.0
4.0 V_DS = 10 V
I_D = 10 mA
3.0 T_A = 25°C
CIRCUIT IN FIGURE 1
2.0
G_pg
NF
1.0
0
50
100 200 300
f, FREQUENCY (MHz)
26
22
18
14
10
6.0
2.0
500 700 1000
Figure 11. Noise Figure and Power Gain
versus Frequency
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