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

By Charles Kitchin, Lew Counts

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Noise Errors In-amp noise errors also need to be considered in a similar way. Since the output section of a typical 3-op amp in-amp operates at unity gain, the noise contribution from the output stage is usually very small. But there are 3-op amp in-amps that operate the output stage at higher gains and 2-op amp in-amps regularly operate the second amplifier at gain. When either section is operated at gain, its noise is amplified along with the input signal. 5 nV Hz Total Error, RTI = Input Error + (Output Error/Gain) Total Error, RTO = (Gain  Input Error) + Output Error (Gain (eni))2 + (eno)2 For example, the (typical) noise of the AD620A is specified as 9 nV/÷Hz eni and 72 nV/÷Hz eno.

5-5 DESIGN ISSUES AFFECTING DC ACCURACY The modern in-amp is continually being improved, providing the user with ever-increasing accuracy and versatility at a lower price. Despite these improvements in product performance, there remain some fundamental applications issues that seriously affect device accuracy. Now that low cost, high resolution ADCs are commonly used, system designers need to ensure that if an in-amp is used as a preamplifier ahead of the converter, the inamp’s accuracy matches that of the ADC.

S. S. = single supply. com for latest products and specifications. 2 At 1 kHz. RTI noise = ÷(eni)2 + (eno/G)2. 3 Operating at a gain of 20. 4 For 10 kHz, <2 k source imbalance. 5 Referred to input: RFI. 6 Operating at a gain of 50. 7 Operating at a gain of 1. 8 At frequency = 4 MHz. 9 At frequency 10 kHz. 1. 11 For 1 kHz, 10 kHz. 12 DC to 10 kHz. A1 A2 +VS 6 3 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.

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