поискавой системы для электроныых деталей |
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LB-9 датащи(PDF) 2 Page - National Semiconductor (TI) |
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LB-9 датащи(HTML) 2 Page - National Semiconductor (TI) |
2 / 3 page 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 |
Аналогичный номер детали - LB-9 |
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Аналогичное описание - LB-9 |
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