Serial Circuit Research Articles

Operation of 3µm bubble serial loop devices designed on single level masking

An all-permalloy single mask level design for a serial loop circuit has been developed and successfully operated using 3 μm bubbles. The design of individual elements for a single level circuit such as generator, replicator and annihilator which were compatible with half-disk propagation patterns was successfully investigated and optimization of permalloy and SiO 2 spacer film thickness was achieved. The small capacity test chips fabricated provided 13-16 Oe window margins with circular drive field ranges of 40 to 50 Oe at 100 kHz. The critical stretching pulse phase margin for replication, which was the minimum phase margin for all functions was found to be 10 degrees. Details of design and characteristics are also discussed including operating margin dependence on frequency and temperature.

Serial residue generator for use in a self-checking computer

This letter describes a serial circuit for generating the residue of a binary number. The object is to produce circuits compatible in speed with most small computers, so that the number of logic gates required is greatly reduced compared with a parallel mode of residue generation.

Design of Servo Controller for Flying Shear Machine Based on ARM and FPGA

The flying shear machine is an important control equipment on the production line, its performance will directly affect the productivity, the quality and the qualified rate of the products. In this paper, the control problem of flying shear machine is taken as the research subject, it discusses the structure of servo controller of flying shear machine, puts forward the core control scheme based on the LPC2294 microprocessor of ARM and the EP2C8Q208N of the field programmable device, designs the hardware circuit of the servo system which includes the peripheral circuit of ARM (the power supply circuit, serial communication circuits, JTAG interface circuits, etc.), the three-phase full-bridge inverting power driver circuit, the current detection circuit and the location detection circuit. In this paper, the functions of the multiple frequency and phase discrimination loop and the function of the position loop are achieved by the FPGA. Data exchange between the FPGA and ARM is achieved through dual-port RAM, while the functions of position loop, speed loop and current loop by programming. In this paper, it takes full advantage of the rich hardware resources of FPGA and the powerful computing capability of ARM, combines the advantages of each other to ensure the rapid and flexibility. ARM processor is used as the core Controller of the Servo system, which can play its high-speed computing and programming capabilities to implement the complex real-time control algorithm and improve the control system performance. On the other hand, because of the large number of control functions and peripheral interface circuits, the use of FPGA can effectively reduces the volume of the system, the computational load on the processor and the complexity of the peripheral digital circuits, thus, all of these practices simplify the design of the hardware and software and improve the reliability and stability of the system.

永久磁石の磁気的性質に関する二三の実験

The magnetic behaviors are important for manufacturers as well as for users when any magnet available is put to use. With this in view, this paper discusses the uniformity of magnetic flux, the magnetic stability, the leakage factor in magnetic circuits, etc. With commercial magnets, the variation rate (σ⁄\barX) of the magnetic flux is about 3 percent. The temperature of tempering or aging affects the temperature coefficient. The degree of stabilization in MT magnet is usually controlled so as to give a flux drop of 7∼10%. The leakage factor in similar serial circuits depends on the reluctance of air gap and the arrangement of permanent magnets.