THS6032_14 Datasheet, PDF (23/35 Pages) Texas Instruments – LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER

THS6032
www.ti.com....................................................................................................................................................... SLOS233F – APRIL 1999 – REVISED AUGUST 2009
ȱ ȳ _{NF + 10log eni} ²
ȧȲ ȧȴ _ǒeRsǓ2
(4)
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^{ȧȧȧȧ}1
ȧȡȢ
)
en
ǒ 2
) IN )
4 kTR_S
RSǓ²_{ȧȣȤȧȧȧȧȳ}
Ȳ
È´
(5)
Figure 50 shows the noise figure graph for the THS6032.
20
18
16
14
12
10
8
6
4
f = 10 kHz
2
T_A = 25°C
0
10
100
1000
10000
Source Resistance − RS (Ω )
Figure 50. Noise Figure vs Source Resistance
OFFSET VOLTAGE
The output offset voltage (V_OO) is the sum of the input offset voltage (V_IO) and both input-bias currents (I_IB) times
the corresponding gains. Figure 51 can be used to calculate the output offset voltage.
Figure 51. Output Offset Voltage Model
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