A Designer's Guide to Instrumentation Amplifiers, 2nd by Charles Kitchin, Lew Counts

By Charles Kitchin, Lew Counts

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For a gain of 10, leave Pin 1 and Pin 8 open. This provides excellent gain stability over temperature, as the on-chip gain resistor tracks the TC of the feedback resistor. Figure 3-10 is a simplified schematic of the AD621. 15% and 5 ppm/C gain drift, the AD621 has much greater built-in accuracy than the AD620. 7 k, allowing the gain to be programmed accurately with a single external resistor. 4 kΩ RG So that The AD621 may also be operated at gains between 10 and 100 by using an external gain resistor, although gain error and gain drift over temperature will be degraded.

Figure 3-15 shows that it is a 3-op amp instrumentation amplifier. The unity gain input buffers consist of superbeta NPN transistors Q1 and Q2 and op amps A1 and A2. These transistors are compensated so that their input bias currents are extremely low, typically 100 pA or less. As a result, current noise is also low, only 50 fA/÷Hz . The input buffers drive a gain-of-5 difference amplifier. Because the 3 k and 15 k resistors are ratio matched, gain stability is better than 5 ppm/ C over the rated temperature range.

Frequency ((RTI) 0 to 1 k Source Imbalance) ���� �� ��� �� �� �� Single-supply in-amps have special design problems that need to be addressed. The input stage must be able to amplify signals that are at ground potential (or very close to ground), and the output stage needs to be able to swing to within a few millivolts of ground or the supply rail. Low power supply current is also important. And, when operating from low power supply voltages, the in-amp needs to have an adequate gain bandwidth product, low offset voltage drift, and good CMR vs.

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