MIN and MAX circuits are the prime components of fuzzy logic. On the other hand, these circuits tend to have rather limited accuracy for multiple inputs due to signal interaction and the difficulty in matching transistors, which are not near to each other. In asynchronous circuits, to obtain acceptable resolution, the number of inputs are limited to ten or fewer. Some applications, such as LVQ for graphics compression, require sorting out of hundreds of signals. Current mirrors are also possible sources of additional errors.
Higher accuracy is possible since there is no requirement for high precision current mirrors.
Even a design of such mirrors is simple their transistors must be of large size to secure adequate accuracy. The LTA comparator shown in Fig. 1 has behavior similar to that of flip-flops and of the sense amplifiers found in dynamic memories. In order to simplify the discussion and analysis all parasitic capacitances, C1 though C5, have been lumped into the equivalent capacitors and . This approximation is valid because grounded capacitances have dominant values and one can represent the much smaller coupling capacitances due to the Miller as grounded capacitors.