| 摘要 |
PURPOSE:To reduce problems of manufacture and to shorten a correction time by measuring the delay time difference co of a circuit used for correction, etc., and the timing skew of an object of correction, and making the correction by calculation. CONSTITUTION:The time difference between points (e) and (d) is measured by a measuring circuit 1 and a control part 2 finds a correction value to control a delay circuit 3. While a SW5 is connected to a point (c), a SW7 is closed to take measurements at points (d) and (e), and a going and returning delay time tR between the points (d) and (b) is found. A selecting circuit 6 is changed over to find the tR regarding all objects to be corrected. While the SW5 is connected to the point (b), the SW7 is opened to find the time difference ted between the points (e) and (d). Then, ted=tR/2+tx, and the delay times t of the object to be corrected is found. The time tx is found regarding all the objects and the value of each delay circuit 3 is set so that the time tx is equal for all. Consequently, the correction value is found easily and the correction time is shortened. |
