MAGNETIC BUBBLE DRIVE CIRCUIT

PURPOSE:To improve the reliability against the operating temperature change, by connecting an external resistor matching the resistance temperature coefficient of each conductor and a current temperature coefficient of magnetic bubbles in series with each conductor of bubble memories and driving the memories with a constant voltage source. CONSTITUTION:In a drive circuit of a function conductor R14 such as magnetic bubble generator and bubble expander, a current correction resistor R23 is connected in series with the conductor R14. The current flowing to the R14 is kept to a current value optimizingly initially set even with the resistance change. The bubbles, however, have the current temperature coefficient in which the required current is reduced according to the temperature rise of the magnetic substance film, the current correction resistor connected in series corrects the current so as to drive the bubbles at the required optimum current for the bubbles. Thus, the suitable current is applied to each conductor according to the temperature of the magnetic substance film, allowing avoid malfunction.