| 摘要 |
PURPOSE:To eliminate the need for manual timing adjusting operation and reduce the man-hour of timing adjustment by reading delay phase data out of a semiconductor memory through a data selector, and connecting plural delay circuits selectively. CONSTITUTION:The data selector 7 is controlled with the control signal of an up/down counter 8 to send out its output signal to a phase comparing circuit 9, and the phase difference from the input signal to a circuit 6 to be adjusted is detected to put the up/down counter 8 in up/down counting operation repeatedly up to a target value. Then, the up/down counter 8 stops at the target value, and a phase comparing circuit 9 sends out a write signal to an ROM writer 10 to write the counted value in a semiconductor memory 11. The data selector 7 reads delay phase data out of a semiconductor memory circuit 12 into which the semiconductor memory 11 is inserted to connect selectively delay circuit 21...2n in the circuit 6 to be adjusted, thereby outputting a specific phase timing signal. |
