BFP420 Datasheet, PDF (8/8 Pages) Siemens Semiconductor Group – NPN Silicon RF Transistor (For high gain low noise amplifiers For oscillators up to 10 GHz)

BFP 420
Noise figure F = f (I_C)
V_CE = 2 V, Z_S = Z_Sopt
Noise figure F = f (I_C)
V_CE = 2 V, f = 1.8 GHz
4.0
3.0
dB
dB
3.0
2.0
2.5
2.0
1.5
f = 6 GHz
f = 5 GHz
1.0
f = 4 GHz
f = 3 GHz
f = 2.4 GHz
0.5
f = 1.8 GHz
f = 0.9 GHz
0.0
0
4
8 12 16 20 24 28 32 mA 38
I_C
Noise figure F = f ( f )
V_CE = 2 V, Z_S = Z_Sopt
3.0
dB
1.5
ZS = 50 Ohm
ZS = ZSopt
1.0
0.5
0.0
0
4
8 12 16 20 24 28 mA 36
I_C
Source impedance for min.
Noise Figure versus Frequency
V_CE = 2 V, I_C = 5 mA / 20 mA
+j50
+j25
+j100
2.0
1.5
1.0
IC = 20 mA
IC = 5 mA
0.5
0.0
0.0 1.0 2.0 3.0 4.0 GHz 6.0
f
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8⁸
+j10
0
10
2.4GHz
1.8GHz
3GHz
0.9GHz
25
4GHz
50
100 _0.45GHz
-j10
5GHz
6GHz
-j25
-j50
-j100
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