IBM eServer iSeries and AS 400E System Builder: Version 5 by Susan Powers et al.

By Susan Powers et al.

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Extra resources for IBM eServer iSeries and AS 400E System Builder: Version 5 Release 2 January 2003 (IBM Redbooks)

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Simplified Schematic 4-3 The AMP03 is a monolithic, unity gain, 3 MHz differential amplifier. Incorporating a matched thin-film resistor network, the AMP03 features stable operation over temperature without requiring expensive external matched components. The AMP03 is a basic analog building block for differential amplifier and instrumentation applications (Figure 4 - 4). 50 CLOSED-LOOP GAIN (dB) AMP03 –IN 2 +IN 3 25k 25k 25k 25k 5 SENSE 7 –VCC 6 OUTPUT 4 –VEE 1 REFERENCE TA = 25C VS = 15V COMMON-MODE REJECTION (dB) 90 80 70 60 50 40 10k 1k 10k 10k FREQUENCY (Hz) 1M 10M 100 90 0 50mV 1s Figure 4-7.

Orienting the resistor so that its axis is perpendicular to the airflow will minimize this effect. �� �������� �������� �� As outlined, a number of dc offset and gain errors are introduced when external resistors are used with a monolithic in-amp. There are three practical solutions to this problem: use higher quality resistors, use software correction, or, better still, use an in-amp that has all of its gain resistors on-chip, such as the AD621. Option 1: Use a Better Quality Gain Resistor As a general rule, only 12-bit or 13-bit gain performance is possible using commonly available 1% resistors, which assumes that some type of initial calibration is performed.

VIN 1 7 8 VOUT 6 REF 4 FB 5 2 Figure 4-12. AD8130 Block Diagram Figure 4-12 is a block diagram of the AD8130. Its design uses an architecture called active feedback which differs from that of conventional op amps. The most obvious differentiating feature is the presence of two separate pairs of differential inputs compared to a conventional op amp’s single pair. Typically for the active feedback architecture, one of these input pairs is driven by a differential input signal, while the other is used for the feedback.

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