Stable fast-settling voltage reference buffer amplifier

摘要

In a feedback-type buffer amplifier designed to be interposed between a reference voltage source and a capacitive load, the output of the amplifier is applied to each of two precisely matched or scaled source follower circuits. The voltages appearing at respective output nodes of the source follower circuits are designed to be identical to each other. But, significantly, the nodes are decoupled from each other. One output node is included in the feedback path of the buffer amplifier, whereas the other node constitutes the output terminal of the composite arrangement. Perturbations or phase shifts due to the load are thus effectively decoupled from the feedback path of the amplifier. A fast- settling stable overall configuration is thereby provided.