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Volume 44, Number 2 Printable Edition

In This Issue:
Editors’ Notes and Product Introductions
The 20-Bit DAC Is the Easiest Part of a 1-ppm-Accurate Precision Voltage Source
Difference Amplifier Enables Low-Power, High-Performance Absolute Value Circuit
Synchronous Inverse SEPIC Topology Provides High Efficiency Buck/Boost Voltage Converters
Ultralow Distortion Audio Panpot Amplifier
Differential-Output Difference Amplifier System with G = ½
Full-Featured Pedometer Design Realized with 3-Axis Digital Accelerometer

Two Ways to Measure Temperature Feature Simplicity, Accuracy, and Flexibility

Thermocouples are widely used for measuring temperature. This article suggests two signal conditioning solutions. The first combines reference-junction compensation and signal conditioning in a single analog IC for convenience and ease of use; the second separates the reference-junction compensation from the signal conditioning to provide greater flexibility and accuracy.

High-Performance Difference Amplifier with Precision Supply-Referenced Level Shift

Designed on small-geometry processes, high-performance ADCs typically run on single 1.8-V to 5-V supplies. When processing ±10-V or larger signals, an amplifier circuit ahead of the ADC can attenuate the signal to keep it from saturating the ADC inputs. A difference amplifier (diff amp) is commonly used when the signal includes a large common-mode voltage.