THS6012_16 Datasheet, PDF (21/37 Pages) Texas Instruments – 500-mA DUAL DIFFERENTIAL LINE DRIVER

THS6012
www.ti.com
NF
+
10log^{ȧȧȱȲǒ}_{eeRnsi Ǔ}²²
ȳ
ȧȧ
È´
SLOS226F – SEPTEMBER 1998 – REVISED JUNE 2012
Because the dominant noise components are generally the source resistance and the internal amplifier noise
voltage, we can approximate noise figure as:
ǒ Ǔ _NF
+
ȱ
10log^{ȧȧȧȧȧ}1
ȧȡȢ
)
en
ǒ 2
) IN )
4 kTRS
Ȳ
RSǓ²_{ȧȣȤȧȧȧȧȧȳ}
È´
Figure 42 shows the noise figure graph for the THS6012.
NOISE FIGURE
vs
SOURCE RESISTANCE
20
T_A = 25°C
18
16
14
12
10
8
6
4
2
0
10
100
1k
10k
R_s – Source Resistance – Ω
Figure 42. Noise Figure vs Source Resistance
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