An investigation of delta noise in square-loop Ferrites

The operation of coincident-current ferrite-core stores is limited by delta noise caused by uncanceled half-select outputs. However, not all half-select signals contribute to delta noise at strobe time. The contribution of the half-select signal depends on its magnitude and relaxation time. An investigation of the half-select output signals, which includes the dependence of the half-select signals on the operation loop, disturb pattern, and primary magnetization state, is presented. The half-select responses are classified as reversible and irreversible, and the delta noise is found to be a function of the irreversible responses only.