Abstract: A complex multiplier includes a carry-sum systolic array (26) of multiplier cells for processing a multiplicand therethrough in accordance with a modified Booths algorithm. The multiplier performs two multiplications and two addition/substraction operations. A ROM (12) provides the multipliers for the operation which are input to a booth decoder (50) through a delay line (48). The delay line (48) delays pairs of bits by one bit each to synchronize with the flow of the partial products through the array (26). After one product is processed in the array (26), the sum and carry is fed back to the input through a delay (52). This delay allows for processing two products in a single operation with a subsequent operation interleaved therebetween. When one operation is complete, it is output to adders (64) and (66) to perform a complex addition and substraction with another input data vector. This addition occurs at one half the rate of the pipeline (26) due to the interleaving of the two operations.

Abstract: The disclosure relates to the chip organization and circuit arrangement of a gallium arsenide MESFET memory for high speed, low power and radiation hard application. The memory is organized into several columns, each column having several memory cells and a sense amplifier. The write and read/sense data buses are placed at the input and output of the sense amplifier to provide better impedance matching to the write and read/sense circuits. The memory circuit as well as the output circuit utilize a combination of d-mode and e-mode gallium arsenide transistors in judicious arrangement to obtain low power requirements and reduced chip size relative to prior art gallium arsenide systems providing the same function and having the same general read access time.

Abstract: A crossover circuit for propagating magnetic domain bubbles in different directions under the drive of an in-plane rotating magnetic field. The crossover circuit includes intersecting vertical and horizontal elements and a pair of L combinations each having a vertical element and a horizontal element. The L combinations are linked to the intersection by a pair of inclined elements. There is also a short horizontal element and a short vertical element linked to the intersection by a second pair of inclined elements.

Abstract: An acoustic surface wave bubble switch in which a magnetic bubble domain traveling in a thin film magnetic platelet can be guided in alternate directions by application of an acoustic wave. An array of longitudinal magnetic elements in the form of single bars and bars combined to form a T configuration together with a rotating in-plane magnetic field causes the magnetic bubble to propagate across the magnetic platelet. One of the configurations of the magnetic element is a T with a second horizontal bar and the bubble will have equal attraction for either of the horizontal bars. At the proper time an acoustic wave can direct the bubble to propagate in the direction of a chosen horizontal bar thereby effecting a switching action.