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LB-9 датащи(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LB-9
подробное описание детали  Universal Balancing Techniques
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LB-9 датащи(HTML) 2 Page - National Semiconductor (TI)

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A voltage follower may be balanced by the technique shown
in Figure 4.R
1 injects a current which produces a voltage
drop across R
3 to cancel the offset voltage. The addition of
the adjustment resistors causes a gain error, increasing the
gain by 0.05%. This small error usually causes no problem.
The adjustment circuit essentially causes the offset voltage
to appear at full output, rather than at low output levels,
where it is a large percentage error.
Differential amplifiers are somewhat more difficult to bal-
ance. The offset adjustment used for a differential amplifier
can degrade the common mode rejection ratio. Figure 5
shows an adjustment circuit which has minimal effect on the
common mode rejection. The voltage at the arm of the pot is
divided by R
4 and R5 to supply an offset correction of ±7.5
mV. R
4 and R5 are chosen such that the common mode
rejection ratio is limited by the amplifer for values of R
3
greater than 1 k
Ω.IfR
3 is less than 1k the shunting of R4 by
R
5 must be considered when choosing the value of R3.
The techniques described for balancing offset voltage at the
input of the amplifier offer two main advantages: First, they
are universally applicable to all operational amplifiers and
allow device interchangeability with no modifications to the
balance circuitry. Second, they permit balancing without in-
terfering with the internal circuitry of the amplifier. The elec-
trical parameters of the amplifiers are tested and guaranteed
without balancing. Although it doesn’t usually happen, bal-
ancing could degrade performance.
00846003
FIGURE 3. Offset Voltage Adjustment for
Non-Inverting Amplifiers
00846004
FIGURE 4. Offset Voltage Adjustment for
Voltage Followers
00846005
FIGURE 5. Offset Voltage Adjustment for
Differential Amplifiers
www.national.com
2


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