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US 9,059,717 B2Granted
Apparatus for frequency compensation using two counters
AssigneeSamsung Electronics Co., Ltd.
InventorsTae-Pyeong Kim, Han-Kyul Lim, Dong-Uk Park
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Abstract
A frequency compensation apparatus includes a first counter setting a reference period using a main clock, a second counter sensing a change in the frequency of a sub clock using the reference period, and a frequency compensator providing a compensated frequency using information on the changed frequency of the sub clock. Related methods are also described.
Claims11
An apparatus for frequency compensation comprising:
- a first counter configured to set a reference period using a main clock;
- a second counter configured to sense a change in the frequency of a sub clock using the reference period;
- and
- a frequency compensator configured to provide a compensated frequency using the change in the frequency of the sub clock,
- wherein the first counter is further configured to set a number of reference clock cycles for the main clock and to set the reference period by measuring a time taken to count the number of reference clock cycles,
- wherein the second counter is further configured to sense the change in the frequency of the sub clock by counting a number of clock cycles of the sub clock corresponding to a time taken to set the reference period, and
- wherein the first counter is further configured to set and store the reference period, and the second counter is further configured to sense the change in the frequency of the sub clock using the reference period stored by the first counter.
4 more elements
An apparatus for frequency compensation comprising:
- a first clock generator configured to generate a first clock;
- a second clock generator configured to generate a second clock;
- a first counter that is configured to count clock cycles of the first clock and identify a time duration for the first clock to produce a predetermined number of the clock cycles;
- a second counter that is configured to count clock cycles of the second clock during a plurality of time intervals corresponding to the time duration and to determine a change in a frequency of the second clock from the clock cycles of the second clock that are counted during the plurality of time intervals corresponding to the time duration;
- and
- a frequency compensator that is configured to produce a frequency compensation value from the change in the frequency of the second clock.
3 more elements
Dependencies are inferred from the claim text.