Semiconductor memory apparatus
First Claim
1. A semiconductor memory apparatus, comprising:
- a delay line configured to delay a reference clock;
a first delay block configured to delay a feedback clock;
a first phase comparator configured to compare the reference clock with an output of the first delay block;
a second delay block configured to delay the reference clock;
a second phase comparator configured to compare the feedback clock with an output of the second delay block;
a delay controller configured to control a delay amount of the delay line based on comparison results from the first and second phase comparators;
a delay model configured to delay an output of the delay line by a modeled delay time to generate the feedback clock; and
a locking detector configured to control the delay controller based on comparison results from the first and second phase comparators.
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Accused Products
Abstract
A semiconductor memory apparatus includes a delay line configured to delay a reference clock, a first delay block configured to delay a feedback clock, a first phase comparator configured to compare the reference clock with an output of the first delay block, a second delay block configured to delay the reference clock, a second phase comparator configured to compare the feedback clock with an output of the second delay block, a delay controller configured to control a delay amount of the delay line based on comparison results from the first and second phase comparators, a delay model configured to delay an output of the delay line by a modeled delay time to generate the feedback clock, and a locking detector configured to control the delay controller based on comparison results from the first and second phase comparators.
21 Citations
29 Claims
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1. A semiconductor memory apparatus, comprising:
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a delay line configured to delay a reference clock; a first delay block configured to delay a feedback clock; a first phase comparator configured to compare the reference clock with an output of the first delay block; a second delay block configured to delay the reference clock; a second phase comparator configured to compare the feedback clock with an output of the second delay block; a delay controller configured to control a delay amount of the delay line based on comparison results from the first and second phase comparators; a delay model configured to delay an output of the delay line by a modeled delay time to generate the feedback clock; and a locking detector configured to control the delay controller based on comparison results from the first and second phase comparators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor memory apparatus, comprising:
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a coarse delay line configured to delay a reference clock; a fine delay line configured to delay an output from the coarse delay line; a first delay block configured to delay a feedback clock; a first phase comparator configured to compare the reference clock with an output of the first delay block; a second delay block configured to delay the reference clock; a second phase comparator configured to compare the feedback clock with an output of the second delay block; a third phase comparator configured to compare the feedback clock with the reference clock; a delay controller configured to control delay amounts of the coarse and fine delay lines based on comparison results from the first to third phase comparators; a delay model configured to delay an output of the delay line by a modeled delay time to generate the feedback clock; and a locking detector configured to control the delay controller based on comparison results from the first and second phase comparators. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for operating a semiconductor memory apparatus, comprising:
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delaying a reference clock by a delay amount to generate a delay clock; delaying a feedback clock by a first amount to generate a delayed feedback clock; comparing the reference clock with the delayed feedback clock; delaying the reference clock by a second amount to generate a delayed reference clock; comparing the feedback clock with the delayed reference clock; controlling the delay amount based on results of the comparing the reference clock with the delayed feedback clock and the comparing the feedback clock with the delayed reference clock; delaying the delay clock by a modeled delay time to generate the feedback clock; and controlling the controlling the delay amount based on the results. - View Dependent Claims (21, 22)
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23. A method for operating a semiconductor memory apparatus, comprising;
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delaying a reference clock by a first delay amount to generate a first delay clock; delaying the first delay clock by a second delay amount to generate a second delay clock; delaying a feedback clock by a first amount to generate a delayed feedback clock; comparing the reference clock with the delayed feedback clock; delaying the reference clock by a second amount to generate a delayed reference clock; comparing the feedback clock with the delayed reference clock; comparing the feedback clock with the reference clock; controlling the first and second delay amounts based on comparison results of the comparing the reference clock with the delayed feedback clock, the comparing the feedback clock with the delayed reference clock, and the comparing the feedback clock with the reference clock; and delaying the second delay clock by a modeled delay time to generate the feedback clock. - View Dependent Claims (24, 25, 26)
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27. A semiconductor memory apparatus, comprising:
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a delay locked loop configured to perform a delay locking operation by comparing a reference clock with a feedback clock to thereby generate a delay locked clock; and a locking detector configured to control the delay locking operation based on results of comparing a delay signal of the reference clock with the feedback clock and comparing the reference clock with a delay signal of the feedback clock. - View Dependent Claims (28, 29)
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Specification