A concept for approximate digital integration is presented. The integrator is equivalent to the RC-integrator (but has no drift) and has an arbitrary long time constant. An example is given showing application to polarity coicidence correlatioin detection of signals in noise.

This article presents material that is new in three areas. First, a new logic system using directly-coupled unipolar transistors is analyzed. It is shown that unipolar transistors have important advantages over bipolar transistors in speed, tolerance of stray signals and noise, and device miniaturization. Second, devices of extreme miniaturization built by an integrated device design and using this logic system are described. Third, how the passive components of the system, in this case resistors, have been integrated into the semiconductor devices is described.