公开(公告)号：JP2001168711A

公开(公告)日：2001-06-22

申请号：JP2000317034

申请日：2000-10-17

Applicant: ST MICROELECTRONICS SRL

Inventor： GUINEA JESUS ,  TOMASINI LUCIANO ,  MAGGIO SANTO

IPC: H03K5/13 ,  H03L7/00 ,  H03L7/081 ,  H03L7/091 ,  H04L7/033

Abstract: PROBLEM TO BE SOLVED: To provide a delay locked loop circuit provided with a delay line provided with delay capable of being changed by a controlled method and a control circuit means for controlling the delay line so as to lock the delay line to a period T for delaying the periodic input signals of the period T. SOLUTION: The delay line 1 supplies plural delay cyclic signals CK1-CKN respectively delayed relating to the periodic input signals only for one part each of the delay. The control circuit means 2 and 7 are provided with a sequence detection circuit means 2 capable of periodically detecting the characteristic sequence of a digital value for indicating the delay by the delayed periodic signals and the delay Δt is reduced or increased so as to be locked to the period T corresponding to the type of the characteristic sequence.

公开(公告)号：DE69929201D1

公开(公告)日：2006-02-02

申请号：DE69929201

申请日：1999-10-18

Applicant: ST MICROELECTRONICS SRL

Inventor： GUINEA JESUS ,  TOMASINI LUCIANO ,  MAGGIO SANTO

IPC: H03K5/13 ,  H03L7/00 ,  H03L7/081 ,  H03L7/091 ,  H04L7/033

Abstract: A delay-locked loop circuit ("DLL") comprises a delay line (1) with a delay ( DELTA t) which can be varied in a controlled manner in order to delay a periodic input signal (CKin) of period T, and circuit means (2, 7) for controlling the delay line (1) in order to lock the delay ( DELTA t) to the period T. The delay line (1) supplies to the control circuit means (2, 7) a plurality of periodic signals (CK1-CKN) each delayed relative to the periodic input signal by a respective fraction of the delay ( DELTA t), and the control circuit means (2, 7) comprise sequence-detector circuit means (2) which can periodically detect, in the delayed signals, characteristic sequences of digital values indicative of the delay ( DELTA t) and, in dependence on the type of characteristic sequence, can bring about a reduction or an increase in the delay ( DELTA t) for locking to the period T.