Alternative Design of a Unity-Gain Follower with Buffer

The design of a unity-gain buffer amplifier in which an extremely low input capacity is achieved by bootstrapping the entire input stage, including the power sources, which was published in 1973 and further discussed in 1976, needs redesigning in order to make it less critical with respect to the choice of components. The new design is stili very simple and based on commercially available operational amplifiers without any matching requirements.