Magnetic bubble memory reading circuit

Abstract

Abstract PURPOSE:To widen an output margin, by providing a threshold voltage generating circuit by the same number as the number of magnetic memory modules. CONSTITUTION:When for instance, a magnetic bubble memory module 4 among said modules 1-4 is selected by module selective switches 16-19, a detecting current flows to earth through a switch 19, an active detector 9, a dummy detector 14 and diodes 23, 28. In this case, when a magnetic bubble passes through on the detector, a detecting bubble output signal is obtained from the detector. This output signal is inputted to a terminal A of a comparator circuit 37 through an amplifier 32 and a DC reproducing circuit 33. On the other hand, when a threshold voltage generating circuit 384 corresponding to the module 4 is selected, a current flows to earth through a threshold level setting variable resistor 51 and a switching circuit 47 from an electric power source VE1, the threshold voltage is inputted to a terminal B of the comparator circuit 37, and a decision signal is outputted. In this way, the output margin can be widened.

Inventors

• 👤 Satoshi Hiraide

Bibliographic Details