| 摘要 |
PURPOSE:To improve the accuracy of bubble detection by interlocking a detector wave with a threshold level in accordance with the temperature change of an element to correct the threshold level. CONSTITUTION:A temperature detecting means 4 monitors the temperature of a magnetic bubble element, and when the temperature is raised, a constant current I outputted from a constant current supplying means 3 is increased. Thereby, a magnetic bubble detecting voltage output VS outputted from a sensing detector 6 is driven so as not to be reduced even if the temperature is raised. Thereby, the value of a differential output (VS-VN) from a differential amplifier circuit 8 is not reduced even if the temperature is increased, and a S/N can be prevented from being reduced. When the constant current I is increased due to the rise of the temperature, voltage applied to the connection part of resistors 10, 11 is boosted, so that a threshold level voltage Vref in a threshold level comparator 9 is also boosted and the deviation of the threshold level due to the rise of the output voltage VN of a dummy detector 7 is corrected. Consequently, the reduction of the S/N can be prevented even if the temperature of the magnetic bubble element is raised.
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