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EC5759 Datasheet(PDF) 4 Page - E-CMOS Corporation |
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EC5759 Datasheet(HTML) 4 Page - E-CMOS Corporation |
4 / 12 page 1MHz, Low Power, CMOS, Rail-to-Rail Dual Operational Amplifier EC5759 E-CMOS Corp. (www.ecmos.com.tw) 3L27N-Rev.P001 Page 4 of 12 Figure 4. Differential Amplifier If the resistor ratios are equal (i.e. R1=R3 and R2=R4), then Instrumentation Amplifier The input impedance of the previous differential amplifier is set by the resistors R1, R2, R3, and R4. To maintain the high input impedance, one can use a voltage follower in front of each input as shown in the following two instrumentation amplifiers. Three-Op-Amp Instrumentation Amplifier The dual EC5759 can be used to build a three-op-amp instrumentation amplifier as shown in Figure 5. Figure 5. Three-Op-Amp Instrumentation Amplifier The amplifier in Figure 5 is a high input impedance differential amplifier with gain of R2/R1. The two differential voltage followers assure the high input impedance of the amplifier. |
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