Question

Four transistor dynamic and six transistor static cmos memory cells

Answer 1

A static RAM cell includes a first pair of transistors, which act as pass or switching transistors during a read or write operation, and as loads during a refresh operation, and a second pair of current sink transistors connected as a cross-coupled flip-flop and connected to the first pair of transistors. The operation of the memory cell transistors during read and write and refresh operations is controlled by different levels of a control signal applied to their respective control terminals, whereby refreshing does not affect reading or writing of data from or into the SRAM cell.