Memory core heating by switching at high frequencies

Abstract

The heating of a memory core caused by high frequency switching has been studied experimentally. For a switching frequency of 4OO kilocycles (the maximum frequency possible in a coincident-current two-to-one selection memory of 5 microsecond cycle time) the temperature of the memory core (DCL material) may rise more than 57 C above ambient in still air or 34 C in an oil bath. At 200 kilocycles (the maximum reasonable switching frequency in the memory) the temperature rises are 33 C and 22 C, respectively. At 30 C above ambient (25 C), the memory core fails to hold information dependably. Thus, with forced air cooling the present memory should have no problem with heating; however, memories of shorter cycle time face serious heating problems.