摘要:
The present invention provides an improved method and apparatus for driving a magnetic bubble device, in which a d-c voltage supply and drive coils are connected to a bridge circuit consisting of four bi-directional switches, and alternating currents with steps (such as currents consisting of triangular waves or trapezoidal waves) are produced in the drive coils by suitably controlling the turn on or off of the bi-directional switches. As a result, the d-c level in the alternating current is not shifted by the variation in width of pulses which control the opening and closing of the bi-directional switches, and the magnetic bubble device is provided with a greatly improved operation margin.
摘要:
A semiconductor integrated circuit receiving at its input pin the terminal voltage of a capacitor which is connected to a power source through a resistor so as to detect the level of the power voltage. The circuit is provided with a level shift circuit which shifts the incoming power voltage level by a predetermined value so that a reset signal is produced by detecting the output of the level shift circuit falling below the threshold level of a logic circuit.
摘要:
A series resonance drive circuit for a magnetic bubble memory comprises a magnetic bubble memory chip or chips, X and Y coils arranged orthogonally to each other to form a rotating magnetic field in a plane of the chip or chips, resonance capacitors connected in series with the X and Y coils to form series resonance circuits with the X and Y coils at a frequency of the rotating magnetic field, A.C. power supplies connected to the resonance circuit, and a reactance device connected to the resonance circuits to compensate a mutual inductance due to a mutual inductive coupling between the X and Y coils and a capacitance due to a capacitive coupling between the X and Y coils. The reactance device includes a mutual inductance device, or an inductance device and a capacitance device.
摘要:
A series resonant drive circuit for a magnetic bubble memory includes X- and Y-coils arranged orthogonally to each other for generating a rotating magnetic field applied to a magnetic bubble memory chip, resonance capacitors each connected to a corresponding one of the X- and Y-coils for forming a series resonance circuit with the corresponding coil at a frequency of the rotating magnetic field, power supplies each connected to a corresponding one of the resonance circuits, and an inductance device connected in series with both of the resonance circuits and a capacitance device connected between the resonance circuits to compensate a mutual inductance due to the inductive coupling between the X- and Y-coils and a capacitance due to the capacitive coupling between the X- and Y-coils. Further, the temperature coefficient of the capacitance device is selected so that the temperature coefficients of the mutual inductance and capacitance between the coils can be compensated.
摘要:
In a magnetic bubble module comprising magnetic bubble chips disposed on substrates and driving coils surrounding the magnetic bubble chips, at least one of the substrates extends from the inside to the outside of the coils and serves as a heat transfer plate. The heat transfer plate includes at least one metal foil having a thickness smaller than a skin depth of the metal.
摘要:
A magnetic bubble memory device is provided with a plurality of memory modules each having at least one magnetic bubble chip. Each module generates a clock for determining the timing to drive the magnetic bubble chip and controls the operation of the magnetic bubble chip. The addresses of a main memory are cyclically allocated to the memory modules in a given unit, so that data transmission can be performed between the memory modules operated asynchronously with each other and the main memory allocated thereto.
摘要:
In a magnetic bubble memory device in which magnetic bubbles are propagated under influence of a rotating magnetic field, a method of controlling a stop operation of a rotating magnetic field in which magnetic field is caused to further rotate beyond the stop direction for a predetermined over-rotation angle and is then caused to return to the stop direction which is followed by the removal of the magnetic field, is presented. The over-rotation angle is in a range of 10 to 40 degrees. The invention is applicable whether bubble drive is performed using a drive current of triangular, square or trapezoidal waveform.
摘要:
A magnetic bubble memory device including a magnetic bubble chip of major-minor structure is disclosed in which an integer m prime to the number n of bits of a minor loop is selected from integers i satisfying an equation i=(2.sup..alpha. .+-.1).multidot.2.sup..beta. +1 or i=(2.sup..alpha. .+-.1).multidot.2.sup..beta., and logical addresses on the minor loop are assigned in such a manner that adjacent logical addresses are spaced apart from each other by m bits.
摘要:
A magnetic bubble memory has a plurality of minor loops for storing data represented by magnetic bubble sequences, a write line for transferring write data to couple them to the minor loops and a read line for transferring read data to a bubble detector. The read line is coupled to a plurality of auxiliary loops through replicators and the auxiliary loops are coupled to the minor loops through replicators. The data replicated to the auxiliary loops are read out.
摘要:
A third conductor is added to a pair of first and second parallel conductors transmitting signals, a part of which conductors are located in an alternating magnetic field. The three conductors are so arranged that the first and third conductors are symmetrical with respect to the center line of the second conductor, and the first and third conductors are interconnected at both extremities thereof.