Chopper Amplifier's PPM Stability Enables Electron Microscope to Scrutinize Individual Molecules

Current source, based on ultra-stable operational amplifier, supplies lens current with 2.5 part-per-million stability, enables a new generation of electron microscopes to resolve better than 8 Angstroms. This article introduces electron microscope principles, illustrates the need for utmost current stability, and describes the current source design. Read full article



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Robert Libbey