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Indirect Current-Feedback Architecture
How It Is Different
- Input Stage Removes the Common-Mode Voltage
- Gain Stage Is Only Applied to a Signal Free of Common-Mode Voltage
- Gain Stage Is Set by Resistors R1 and R2 (for Maximum Precision, Both Resistors Reside Either on the Die or Outside of the Amplifier)
For Comprehensive Details About the Indirect Current-Feedback Process, see Application Note 4034: Three is a Crowd for Instrumentation Amplifiers
Advantages
Using proprietary technology, the indirect current-feedback amplifier solves multiple design problems.
- Input Common-Mode Voltage Range Includes Ground Regardless of Gain Setting
- Allows 2.85V to 5.5V Single-Supply Operation
- Gain Is Set by Ratio of ppm-Matched Resistors, Ensuring Precise Gain Over Temperature
- Optional Internal Zero-Drift Buffer Provides Precise Reference Over Temperature
- Available in Small TDFN and SOT23 Packages
See a Parametric Table of Instrumentation Amps with Indirect Current-Feedback Architecture
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