THS6062IDR Datasheet, PDF (20/36 Pages) Texas Instruments – LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER

THS6062
SLOS228D – JANUARY 1999 – REVISED OCTOBER 2007
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NF
+
10log^{ȧȧȱȲǒ}_{eeRnsi Ǔ}²²
ȳ
ȧȧ
È´
(3)
Because the dominant noise components are generally the source resistance and the internal amplifier noise
voltage, we can approximate the noise figure as:
ǒ Ǔ _NF
+
ȱ
10log^{ȧȧȧȧȧ}1
ȧȡȢ
)
en
ǒ 2
) IN )
4 kTRS
RSǓ²_{ȧȣȤȧȧȧȧȧȳ}
Ȳ
È´
(4)
Figure 42 shows the noise figure graph for the THS6062.
NOISE FIGURE
vs
SOURCE RESISTANCE
16
f = 10 kHz
14 ^TA ^{= 25°C}
12
10
8
6
4
2
0
10
100
1k
10 k
Source Resistance − Ω
Figure 42. Noise Figure vs Source Resistance
20
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