| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a delay circuit that implements high precision by keeping a constant increase and decrease in delay time when changing the number of delay stages. <P>SOLUTION: The delay circuit includes a plurality of delay stages connected in series, a detection circuit and an adjustment circuit. Each delay stage includes a first delay element for inverting a signal from the preceding stage before transfer to the following stage, and a second delay element for inverting a signal from the following stage before transfer to the preceding stage or inverting a delayed signal, which is the inversion of the signal from the preceding stage, before transfer to the preceding stage. The detection circuit detects propagation delay times in respective odd-numbered and even-numbered delay stages from the signal reception from the preceding stage to the signal output from the second delay element through the delayed signal. The adjustment circuit establishes a constant propagation delay time in the odd-numbered and even-numbered delay stages on the basis of the detection results of the detection circuit. <P>COPYRIGHT: (C)2013,JPO&INPIT |
