摘要:
An optical transmission system which can transmit with high accuracy even such an optical signal that has high timing accuracy and an irregular period and contains a DC component. In this system, a leading edge detecting circuit (1) which detects the leading edge of the waveform of transmission signals, a pulse generating circuit (2) for transmission which generates a pulse signal (b) composed of an inverted paired pulse the polarities of which are inverted each other at the detecting timing of the circuit (1), and a light intensity modulating circuit (3) which generates a light modulated signal (c) based on the pulse signal (b) are provided on the transmission side, and an AC coupling and receiving circuit (4) which receives the light intensity-modulated signal (c) and only fetches the AC component of the signal (c) and a discriminating circuit (5) which discriminates the leading timing from received signals are provided on the reception side. In addition, a similar constitution is provided for transmitting signals related to the falling of the waveform of the transmission signals, and the leading edge and falling edge of the waveform of the original transmission signals are reproduced based on discriminated leading timing and falling timing.
摘要:
A variable delay circuit 42 provides an adjustable delay to a strobe signal S5. An input latch circuit 14 latches each bit data included in internal serial data S2 by a strobe signal S6 delayed by the variable delay circuit 42. A delay set unit 40 adjusts a delay amount τ1 provided to the strobe signal S5 by the variable delay circuit 42. While a calibration operation is being executed in which a known calibration pattern is inputted as serial data, the delay set unit 40 statistically acquires output latch data S3 of the input latch circuit 14, and adjusts the delay amount τ1 such that probabilities of occurrence of 1 and 0 becomes a predetermined ratio.
摘要:
An optical transmission system is provided, which permits high-precision optical transmission of a signal even if the signal has a high accurate timing, an indefinite period, and a DC component. The transmitting side is provided with a rise edge detecting circuit 1 for detecting the rise edge of a transmitting signal waveform, a transmitting pulse generating circuit 2 for generating a transmitting pulse signal (b) constituted by a pair of opposite-polarity pulses inverting their polarities at the detected timing, and a light intensity modulation circuit 3 for generating a light intensity modulated signal (c) based on the pulse signal (b). The receiving side is provided with an AC-coupled receiving circuit 4 for receiving the light intensity modulated signal (c) and extracting therefrom only an AC component, and a discrimination circuit 5 for discriminating the rise timing from the received signal. Further, a similar arrangement is provided for transmitting a signal associated with the fall edge of the transmitting signal waveform. On the basis of the discriminated rise timing and the fall timing, the rise edge and the fall edge of the original transmitting signal waveform are regenerated.
摘要:
Provided is a method for managing manufacturing apparatuses used in a managed production line including a plurality of manufacturing processes for manufacturing an electronic device, each of the apparatuses being used in each of the processes, the method including: acquiring a property of a reference device manufactured in a predetermined reference production line including the manufacturing processes; performing at least one of the manufacturing processes in the managed production line, performing the other manufacturing processes in the reference production line, and manufacturing a comparison device; measuring a property of the comparison device; comparing the measured properties between the reference and the comparison devices; and judging whether the manufacturing apparatus used in the at least one manufacturing process is defective or not, based on a property difference between the reference and the comparison devices.
摘要:
There is provided a manufacturing system for manufacturing an electronic device through a plurality of manufacturing stages. The manufacturing system includes a plurality of manufacturing apparatuses performing processes corresponding to the plurality of manufacturing stages. The manufacturing system includes a manufacturing line that manufactures the electronic device, a manufacturing control section that causes the manufacturing line to manufacture a wafer having therein a test circuit including a plurality of transistors under measurement, a measuring section that measures an electrical characteristic of each of the plurality of transistors under measurement in the test circuit, an identifying section that identifies, among the plurality of manufacturing stages, a manufacturing stage in which a defect is generated, with reference to a distribution, on the wafer, of one or more transistors under measurement whose electrical characteristics do not meet a predetermined standard, and a setting changing section that changes a setting for a manufacturing apparatus that performs a process corresponding to the manufacturing stage in which the defect is generated.
摘要:
A change-point detection circuit 16 extracts a clock signal S3 from serial data S1, input data. A variable delay circuit 40 provides a delay in accordance with a delay control signal S8a to a reference signal S4 having a predetermined frequency, so that the phase of the reference signal S4 is shifted on the basis of an initial delay. An input latch circuit 14 latches internal serial data S2 by using an output signal of the variable delay circuit 40 as a strobe signal S5. A phase comparator 22 matches the frequencies of the clock signal S3 and the strobe signal S5 with each other, and generates phase difference data S9 in accordance with a phase difference between the two signals. A loop filter 30 integrates the phase difference data S9 generated by the phase comparator 22 and outputs it as the delay control signal S8a. The phase shift amount acquisition unit 50 acquires a phase shift amount based on the delay control signal S8a, the phase shift amount being based on the initial delay provided to the reference signal by the variable delay circuit 40.
摘要:
Provided is a device identifying method for identifying an electronic device including an actual operation circuit operating at a time of actual operation of the electronic device and a test circuit provided with a plurality of test elements and operating at a time of testing of the electronic device, the device identifying method including: a property measuring step of measuring electric properties respectively of the plurality of test elements; an identification information storing step of storing the electric properties respectively of the plurality of test elements, as identification information of the electronic device; an identification information obtaining step of measuring, in an attempt to identify a target electronic device, electronic properties of a plurality of test elements included in the target electronic device, thereby obtaining identification information of the target electronic device; and a matching step of comparing the identification information obtained in the identification information obtaining step and the identification information stored in the identification information storing step, and judging that, when there is matching in identification information, the target electronic device whose identification information is obtained in the identification information obtaining step is the electronic device whose identification information is stored in the identification information storing step.