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 7 of 15
NXP Semiconductors
BFT25A
NPN 5 GHz wideband transistor
Table 8. Noise parameters
f (MHz) V
CE
(V) I
C
(mA) F
min
(dB) 
opt
R
n
/50
(mag) (ang)
500 1 1 1.9 0.79 4 2.5
See Table 9;
Z
o
= 50 .
Average gain parameter: MSG = 11.2 dB.
Fig 12. Noise circle figure.
Table 9. Noise parameters
f (MHz) V
CE
(V) I
C
(mA) F
min
(dB) 
opt
R
n
/50
(mag) (ang)
10001120.7482.6
mcd109
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
MSG
11.2 dB
10 dB
8 dB
8 dB
4 dB
3 dB
F
min
= 2 dB
Γ
opt