By Charles Kitchin and Lew Counts
A Designers consultant to Instrumentation Amplifiers, written by means of Charles Kitchin and Lew Counts, supplies a finished review of Instrumentation Amplifier expertise and alertness.
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Extra info for A Designer's Guide to Instrumentation Amplifiers
The AD627 is a true instrumentation amplifier built using two feedback loops. Its general properties are similar to those of the classic 2-op amp instrumentation amplifier configuration, and can be regarded as such, but internally the details are somewhat different. The AD627 uses a modified current feedback scheme which, coupled with interstage feedforward frequency compensation, results in a much better CMRR (common-mode rejection ratio) at frequencies above dc (notably the line frequency of 50 Hz to 60 Hz) than might otherwise be expected of a low power instrumentation amplifier.
However, some chip resistors can have TCs of 200 ppm/ C or even 250 ppm/ C. Even when a 1% 100 ppm/C resistor is used, the gain accuracy of the in-amp will be degraded. 01% (100 ppm/C) for every C change in temperature. The initial gain error can easily be subtracted out in software, but to correct for the error vs. temperature, frequent recalibrations (and a temperature sensor) would be required. 1%) accuracy for a 10C change. An in-amp with a standard 1% metal film �� � ���� ���� Figure 5-10.
1. 11 For 1 kHz, 10 kHz. 12 DC to 10 kHz. A1 A2 +VS 3 6 RB +IN 8 RA RA AD8202 G = 10 RC + – + – RG RB G=2 A2 100k A1 –IN 1 4 RG 5 RF RF RC 2 COMM Figure 4-1. AD8202 Connection Diagram 4-1 As shown in Figure 4-2, the preamp incorporates a dynamic bridge (subtractor) circuit. Identical networks (within the shaded areas) consisting of R A, R B, RC, and RG attenuate input signals applied to Pins 1 and 8. , zero), the two attenuators form a balanced-bridge network. When the bridge is balanced, the differential input voltage at A1, and thus its output, will be zero.