A technique for stabilization and calibration of precision analog circuit components such as amplifiers. A sample and hold circuit is placed in the feedback loop of the component. The input of the component is periodically coupled to reference voltage while the sample and hold circuit is set to a sample...http://www.google.co.uk/patents/US5065351?utm_source=gb-gplus-sharePatent US5065351 - Stabilization and calibration of precision electronic circuit component
