DELAY LOCKED LOOP TO CANCEL OFFSET AND MEMORY DEVICE INCLUDING THE SAME
First Claim
1. A memory device comprising:
- a clock delay circuit configured to transmit a reference clock to a data output circuit; and
a delay locked loop including a variable delay circuit and a clock delay replica circuit, the variable delay circuit configured to generate a first clock by delaying the reference clock, and the clock delay replica circuit configured to receive the first clock and replicate the clock delay circuit, the delay locked loop being configured to receive a second clock which is the delayed reference clock from the clock delay circuit, and adjust a delay of the clock delay replica circuit based on the second clock and a third clock output from the clock delay replica circuit.
1 Assignment
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Accused Products
Abstract
A delay locked loop according to some example embodiments of the inventive concepts may include first, second, and third delay circuits, first and second phase detectors, and first and second controllers. The first delay circuit may generate a first clock by delaying a reference clock. The second and third delay circuits may be configured to generate a second and third clock respectively by delaying the first clock. The first and second phase detector may be configured to detect a phase difference between the second clock and the third clock and the third clock respectively. The first controller may be configured to adjust a delay of the third delay circuit using a detection result of the first phase detector. The second controller may be configured to adjust a delay of the first delay circuit using a detection result of the second phase detector.
9 Citations
20 Claims
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1. A memory device comprising:
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a clock delay circuit configured to transmit a reference clock to a data output circuit; and a delay locked loop including a variable delay circuit and a clock delay replica circuit, the variable delay circuit configured to generate a first clock by delaying the reference clock, and the clock delay replica circuit configured to receive the first clock and replicate the clock delay circuit, the delay locked loop being configured to receive a second clock which is the delayed reference clock from the clock delay circuit, and adjust a delay of the clock delay replica circuit based on the second clock and a third clock output from the clock delay replica circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A delay locked loop comprising:
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a first delay circuit configured to generate a first clock by delaying a reference clock; a second delay circuit configured to generate a second clock by delaying the first clock; a third delay circuit configured to generate a third clock by delaying the first clock; a first phase detector configured to detect a phase difference between the second clock and the third clock; a second phase detector configured to detect a phase difference between the reference clock and the third clock; a first controller configured to adjust a delay of the third delay circuit based on an output from the first phase detector; and a second controller configured to adjust a delay of the first delay circuit based on an output from of the second phase detector. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A memory device comprising:
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a variable delay circuit configured to output a first delayed clock based on a reference clock signal and a first delay code, the first delay code indicating a delay in the variable delay circuit; a clock delay circuit configured to output a second delayed clock based on the first delayed clock; a data output circuit configured to output a data output signal based on the second delayed clock; a clock delay replica circuit configured to output a third delayed clock based on the first delayed clock and a second delay code, the second delay code indicating a delay in the clock delay replica circuit; a data output replica circuit configured to output a data output replica signal based on the third delayed clock. - View Dependent Claims (17, 18, 19, 20)
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Specification