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US 8,138,809 B2Granted
Periodic signal delay apparatus, systems, and methods
AssigneeMicron Technology, Inc.
InventorYantao Ma
Life of this patent
Estimating the term…
Abstract
Apparatus, systems, and methods are disclosed that operate to delay a periodic input signal in one or more delay elements of a group of delay elements to generate a periodic output signal and to vary a power supply to the delay elements. Additional apparatus, systems, and methods are disclosed.
Claims18
A method comprising:
- delaying a periodic input signal in one or more delay elements of a group of delay elements to generate a periodic output signal;
- and
- modulating a delay imparted by one or more of the delay elements in the group of delay elements to the periodic input signal while the periodic input signal is being delayed, the modulating including:
- determining a phase difference between the periodic input signal and the periodic output signal;
- determining a pulse width and a frequency of the periodic input signal;
- comparing the phase difference with a hysteresis loop;
- reducing the delay imparted by each of the one or more delay elements if the phase difference is higher than an upper limit of the hysteresis loop;
- and
- increasing the delay imparted by each of the one or more delay elements if the phase difference is lower than a lower limit of the hysteresis loop.
6 more elements
An apparatus comprising:
- a feedback loop configured to generate a periodic output signal from a periodic input signal;
- a plurality of delay elements in the feedback loop configured to delay the periodic input signal to generate the periodic output signal, the plurality of delay elements comprising a plurality of coarse delay elements and a plurality of fine delay elements;
- and
- a first module coupled to the feedback loop and configured to modulate a delay imparted by one or more of the delay elements to the periodic input signal while the periodic input signal is being delayed, the first module comprising a circuit coupled to the fine delay elements, the first module including:
- a second module configured to determine a frequency of the periodic input signal;
- and
- a third module configured to modulate the delay imparted by one or more of the delay elements according to the frequency of the periodic input signal.
4 more elements
An apparatus comprising:
- a feedback loop configured to generate a periodic output signal from a periodic input signal;
- a plurality of delay elements in the feedback loop configured to delay the periodic input signal to generate the periodic output signal;
- and
- a first module coupled to the feedback loop and configured to modulate a delay imparted by one or more of the delay elements to the periodic input signal while the periodic input signal is being delayed, the first module comprising:
- a phase detector comprising a first input coupled to receive the periodic input signal, a second input coupled to receive the periodic output signal, and a hysteresis loop, the phase detector being configured to compare a phase difference between the periodic input signal and the periodic output signal with the hysteresis loop and generate output based on the comparison;
- an average filter coupled to the phase detector and configured to average the output from the phase detector to generate an averaged output;
- a counter coupled between the average filter and a latch to receive the averaged output from the average filter, the counter being configured to change latch data in the latch based on the averaged output;
- a pulse width detector coupled to the phase detector and a multiplexer, the pulse width detector having a first input coupled to receive the periodic input signal and a second input coupled to receive the periodic output signal, the pulse width detector being configured to determine a pulse width and a frequency of the periodic input signal;
- and
- wherein the latch is coupled to the one or more of the delay elements and configured to couple the latch data to the one or more of the delay elements to determine a delay imparted by each of the one or more of the delay elements.
7 more elements
A system comprising:
- a processor;
- and
- a memory device coupled to the processor, the memory device configured to receive command signals from the processor and the memory device including:
- an array of memory cells;
- a feedback loop configured to receive a periodic input signal;
- a plurality of delay elements in the feedback loop configured to delay the periodic input signal and to generate a periodic output signal, the plurality of delay elements comprising a plurality of coarse delay elements and a plurality of fine delay elements;
- and
- a first module coupled to the feedback loop and configured to modulate a delay imparted by one or more of the delay elements to the periodic input signal while the periodic input signal is being delayed, the first module comprising a circuit coupled to the fine delay elements, the first module including:
- a second module configured to determine a frequency of the periodic input signal;
- and
- a third module configured to modulate the delay imparted by one or more of the delay elements according to the frequency of the periodic input signal.
8 more elements
Dependencies are inferred from the claim text.