Composite precision, high-frequency rail-to-rail amplifier

摘要

A composite amplifier is constructed by connecting the respective input terminals of a high-frequency amplifier and a precision amplifier together and by connecting the output of the precision amplifier to the offset trim port of the high-frequency amplifier. The amplifiers are structured such than a pole in the frequency response curve of the high-frequency amplifier cancels a zero in the frequency response curve of the precision amplifier, thereby producing a single pole roll off response curve for the composite amplifier. In the preferred embodiment the high-frequency and precision amplifiers are formed on a single chip and the pole-zero match is therefore maintained at all conditions of temperature and other variables.