Tuesday, March 02, 2010

Ask the Applications Engineer 39—Zero-Drift Operational Amplifiers

Zero-drift amplifiers dynamically correct their offset and reshape their noise density. Two commonly used types—auto-zero and choppers—achieve nanovolt-level offsets and extremely low drift. 1/f noise is seen as a dc error, so it is removed as well. In addition, zero-drift amplifiers have higher open-loop gain, power-supply rejection, and common-mode rejection than standard amplifiers.

Free and Open-Source Software—An Analog Devices Perspective

The rapid increase in use of Free and Open-Source Software (FOSS) represents a significant long-term trend. FOSS licenses make source code available and grant developers the right to study, change, and improve the design. FOSS, already playing a role in every major software category from 64-bit servers to 8-bit microcontrollers, will fundamentally change the nature of software for all users and developers.