THS6032 Datasheet, PDF (26/31 Pages) Texas Instruments – LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER

THS6032
LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
SLOS233C – APRIL1999 – REVISED MARCH 2000
APPLICATION INFORMATION
noise calculations and noise figure (continued)
Figure 50 shows the noise figure graph for the THS6032.
NOISE FIGURE
vs
SOURCE RESISTANCE
20
18
16
14
12
10
8
6
4
f = 10 kHz
2
T_A = 25 Deg. 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.
RF
IIB–
RG
+
–
VI
+
VO
RS
IIB+
ǒ ǒ ǓǓ ǒ ǒ ǓǓ VOO + VIO
1)
RF
RG
" IIB₎ RS
1)
RF
RG
" IIB– RF
Figure 51. Output Offset Voltage Model
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