Patent US 3,969,619

A solid-state servo memory characterized by a maximum value selection circuit which provides, to an analog integrator, a signal commensurate with the magnitude of the one of a plurality of inputs having the instantaneously highest value. The memory is capable of operation in a manual or automatic mode and, in the automatic mode, the integrator is isolated from the memory output terminal but is continually reset to the output level of the selection circuit. In the manual mode the output of the integrator is coupled to the memory output terminal and may be driven in either direction.