Design Guide – Using Zero-Drift Amplifiers in Wider Bandwidth Applications
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Design Guide – Using Zero-Drift Amplifiers in Wider Bandwidth Applications

This article provides a short description of chopping, auto-zeroing, and the sources of zero-drift artifacts, including a summary of some techniques that amplifier designers can use to reduce their impact. It also explains how to minimize the impact of these residual AC artifacts in a precision signal chain, including matching input source impedance, filtering, and frequency planning. Zero-drift operational amplifiers use chopping, auto-zeroing, or a combination of both techniques to remove unwanted low frequency error sources like offset and 1/f noise. Traditionally, these amplifiers have only been used in low bandwidth applications since these dynamic techniques produce artifacts at higher frequencies. Wider bandwidth solutions can also benefit from zero-drift op amps’ excellent DC performance as long as high frequency errors such as ripple, glitches, and intermodulation distortion (IMD) are considered in the system design.
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