Title:
SKEW CORRECTING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2007/083443
Kind Code:
A1
Abstract:
A skew correcting apparatus comprises a transition detector (10), when detecting a
transition of an input data signal, provides a pulse signal; a variable delay line
(20) that generates a first delayed data signal obtained by delaying the input
data signal by a variable delay amount (VD); a fixed delay line (30) that generates
a second delayed data signal obtained by further delaying the first delayed data
signal by a fixed delay amount (FD); a phase comparator (50) that compares the
transition of the second delayed data signal with the phase of a clock signal;
and a control part (60) that controls, based on a result of the comparison, the
delay amount (VD) of the variable delay line (20). When the transition of the second
delayed data signal advances relative to a clock edge of the clock signal, the
control part (60) outputs a first control signal for increasing the delay amount
(VD). When the transition of the second delayed data signal lags behind a clock
edge of the clock signal, the control part (60) outputs a second control signal
for reducing the delay amount (VD).
Inventors:
NISHIKAWA KAORI
YOSHIKAWA TAKEFUMI
YOSHIKAWA TAKEFUMI
Application Number:
PCT/JP2006/323483
Publication Date:
July 26, 2007
Filing Date:
November 24, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
NISHIKAWA KAORI
YOSHIKAWA TAKEFUMI
NISHIKAWA KAORI
YOSHIKAWA TAKEFUMI
International Classes:
G06F1/10; H03K5/13
Foreign References:
| JPH11168365A | 1999-06-22 |
Attorney, Agent or Firm:
MAEDA, Hiroshi et al. (5-7 Hommachi 2-chome, Chuo-k, Osaka-shi Osaka 53, JP)
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