Datasheet

BFT25A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 5 — 12 September 2011 6 of 15
NXP Semiconductors
BFT25A
NPN 5 GHz wideband transistor
V
CE
=1 V. V
CE
=1 V.
Fig 9. Minimum noise figure as a function of
collector current.
Fig 10. Minimum noise figure as a function of
frequency.
4
2
1
0
3
mcd145
10
−1
110
F
(dB)
I
C
(mA)
f =
2 GHz
1 GHz
500 MHz
4
2
1
0
3
mcd146
10
2
10
3
10
4
F
(dB)
f (MHz)
I
C
=
2 mA
1 mA
0.5 mA
See Table 8;
Z
o
= 50 .
Average gain parameter: MSG = 14.5 dB.
Fig 11. Noise circle figure.
mcd108
0.2
0.5
1
2
5
0.2
0.5
1
2
5
10
10
0
5
0.50.2 2
1
10
+ j
− j
∞
stability
circle
pot. unst.
region
F
min
= 1.9 dB
Γ
opt
11 dB
6 dB
4 dB
MSG
14.5 dB
13 dB
2.5 dB