IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0314177
(2005-12-22)
|
등록번호 |
US-7579970
(2009-09-08)
|
우선권정보 |
KR-10-2004-0111658(2004-12-24) |
발명자
/ 주소 |
- Seo, II Won
- Ahn, Jae Hwan
|
출원인 / 주소 |
- Samsung Electronics Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
2 |
초록
▼
In a timing recovery method, two consecutive sampling values may be generated based on a sampled input signal. The input signal may be sampled according to a phase interval of a sampling clock. A slope between the two consecutive sampling values may be calculated, and a difference between a target s
In a timing recovery method, two consecutive sampling values may be generated based on a sampled input signal. The input signal may be sampled according to a phase interval of a sampling clock. A slope between the two consecutive sampling values may be calculated, and a difference between a target slope and the calculated slope may be determined. A phase of the sampling clock may be compensated based on the difference between the target slope and the calculated slope.
대표청구항
▼
What is claimed is: 1. A timing recovery method comprising: generating two consecutive sampling values based on a sampled input signal, the input signal being sampled according to a phase interval of a sampling clock; calculating a sampling slope corresponding to a difference between the two consec
What is claimed is: 1. A timing recovery method comprising: generating two consecutive sampling values based on a sampled input signal, the input signal being sampled according to a phase interval of a sampling clock; calculating a sampling slope corresponding to a difference between the two consecutive sampling values; and compensating a phase of the sampling clock based on at least a difference between a target slope and the calculated sampling slope; wherein generating the two consecutive sampling values includes, detecting when two consecutive values of the sampled input signal are positive, and generating the two consecutive sampling values based on a plurality of sequential values of the sampled input signal selected in response to the two consecutive positive values. 2. The timing recovery method of claim 1, wherein compensating the phase of the sampling clock includes, dividing the difference between the target slope and the calculated sampling slope by a slope Interval to produce a phase compensation value, the slope Interval being calculated by dividing a difference between a maximum value and a minimum value of the calculated sampling slope by a number of phase compensation steps. 3. The timing recovery method of claim 2, wherein the maximum value is a sum of the two consecutive sampling values and the minimum value is a negative sum of the two consecutive sampling values. 4. The timing recovery method of claim 1, further comprising: calculating an input signal gain by adding the two consecutive sampling values; and compensating a gain of the input signal based on a difference between the calculated input signal gain and a target gain. 5. A timing recovery method comprising: generating two consecutive sampling values based on a sampled input signal, the input signal being sampled according to a phase interval of a sampling clock; calculating a sampling slope corresponding to a difference between the two consecutive sampling values; compensating a phase of the sampling clock based on at least a difference between a target slope and the calculated sampling slope; calculating an input signal gain by adding the two consecutive sampling values; and multiplying the target slope by a ratio of the calculated input signal gain to a target gain to compensate the target slope; wherein the phase of the sampling clock is compensated based on the difference between the compensated target slope and the calculated sampling slope. 6. The timing recovery method of claim 5, wherein generating two consecutive sampling values includes: detecting when two consecutive values of the sampled input signal are positive; and generating the two consecutive sampling values based on a plurality of sequential values of the sampled signal selected in response to the two consecutive positive values. 7. The timing recovery method of claim 5, wherein compensating the phase of the sampling clock includes, dividing the difference between the compensated target slope and the calculated sampling slope by a slope interval to produce a phase compensation value, the slope interval being calculated by dividing a difference between a maximum value and a minimum value of the calculated sampling slope by a number of phase compensation steps. 8. The timing recovery method of claim 7, wherein the maximum value is a sum of the two consecutive sampling values and the minimum value is a negative sum of the two consecutive sampling values. 9. The timing recovery method of claim 5, further comprising: calculating a difference between the calculated input signal gain and a target gain; and compensating a gain of the input signal using the difference between the calculated input signal gain and the target gain. 10. A timing recovery apparatus comprising: a sample decision unit configured to generate a first sampling value and a second sampling value based on a sampled Input signal, the input signal being sampled according to a phase interval of a sampling clock; a slope arithmetic unit configured to calculate a sampling slope corresponding to a difference between the first sampling value and the second sampling value; a slope difference arithmetic unit configured to calculate a difference between a target slope and the calculated sampling slope; and a phase compensation unit configured to generate a phase compensation signal based on at least the difference between the target slope and the calculated sampling slope, wherein the sample decision unit is configured to, detect when two consecutive values of the sampled input signal are positive, and generate the first and second sampling values based on a plurality of sequential values of the sampled signal selected in response to the two consecutive positive values of the sampled input signal. 11. The timing recovery apparatus of claim 10, wherein the sample decision unit Is further configured to, store the plurality of sequential values in response to, and including, the two consecutive positive values of the sampled input signal, generate the first sampling value based on a first portion of the stored values, and generate the second sampling value based on a second portion of the stored values. 12. The timing recovery apparatus of claim 10, wherein the sample decision unit includes: a sign decision unit receiving each value of the sampled input signal and configured to detect when the two consecutive positive values of the sampled input signal have been received; a shift register configured to store a plurality of sequentially-received values of the sampled input signal in response to the two consecutive positive values; a first average arithmetic unit configured to convert all negative values in the first portion of stored values to positive values, average the values in the first portion of stored values to generate a first average value, and output the first average value as the first sampling value; and a second average arithmetic unit configured to convert all negative values in the second portion of stored values to positive values, average the values in the second portion of stored values to generate a second average value, and output the second average value as the second sampling value. 13. The timing recovery apparatus of claim 10, wherein the phase compensation unit outputs the difference between the target slope and the calculated sampling slope divided by a slope interval as the phase compensation signal, the slope interval being calculated by dividing a difference between a maximum value and a minimum value of the calculated slope by a number of phase compensation steps. 14. The timing recovery apparatus of claim 13, wherein the maximum value is a sum of the first sampling value and the second sampling value and the minimum value is a negative sum of the first sampling value and the second sampling value. 15. The timing recovery apparatus of claim 10, further comprising: a gain arithmetic unit configured to calculate an input signal gain corresponding to a sum of the first sampling value and the second sampling value; a gain difference arithmetic unit configured to calculate a difference between the calculated input signal gain and a target gain; and a gain compensation decision unit configured to generate a gain control signal controlling the input signal gain based on the difference between the calculated input signal gain and the target gain. 16. A timing recovery apparatus comprising: a sample decision unit configured to generate a first sampling value and a second sampling value based on a sampled input signal, the input signal being sampled according to a phase interval of a sampling clock; a slope arithmetic unit configured to calculate a sampling slope corresponding to a difference between the first sampling value and the second sampling value; a slope difference arithmetic unit configured to calculate a difference between a target slope and the calculated sampling slope; a phase compensation unit configured to generate a phase compensation signal based on at least the difference between the target slope and the calculated sampling slope; and a gain arithmetic unit configured to calculate an input signal gain corresponding to a sum of the first sampling value and the second sampling value; wherein the phase compensation unit is configured to generate the phase compensation signal based on the difference between the calculated sampling slope and the target slope, the input signal gain, and a target gain. 17. The timing recovery apparatus of claim 16, wherein the sample decision unit is configured to, detect when two consecutive values of the sampled input signal are positive, and generate the first and second sampling values based a plurality of sequential values of the sampled signal selected in response to the two consecutive positive values of the sampled input signal. 18. The timing recovery apparatus of claim 16, wherein the sample decision unit is further configured to, store a plurality of sequential values of the sampled input signal in response to, and including, two consecutive positive values of the sampled signal, generate the first sampling value based on a first portion of the stored values, and generate the second sampling value based on a second portion of the stored values. 19. The timing recovery apparatus of claim 16, wherein the sample decision unit includes: a sign decision unit configured to detect when two consecutive positive values of the sampled input signal have been received; a shift register configured to store a plurality of sequentially-received values of the sampled input signal in response to the two consecutive positive values; a first average arithmetic unit configured to convert all negative values in the first portion of stored values to positive values, average the values in the first portion of stored values to generate a first average value, and output the first average value as the first sampling value; and a second average arithmetic unit configured to convert all negative values in the second portion of stored values to positive values, average the values in the second portion of stored values to generate a second average value, and output the second average value as the second sampling value. 20. The timing recovery apparatus of claim 16, wherein the phase compensation unit is configured to, multiply the target slope by a ratio of the calculated input signal gain to a target gain to compensate the target slope, and divide the difference between the compensated target slope and the calculated sampling slope by a slope Interval to generate the phase compensation signal, the slope interval being calculated by dividing a difference between a maximum value and a minimum value of the calculated sampling slope by a number of phase compensation steps. 21. The timing recovery apparatus of claim 20, wherein the maximum value is a sum of the first sampling value and the second sampling value and the minimum value is a negative sum of the first sampling value and the second sampling value. 22. The timing recovery apparatus of claim 16, further comprising, a gain difference arithmetic unit configured to calculate a difference between the calculated input signal gain and a received target gain, and a gain compensation decision unit configured to generate a gain control signal controlling the input signal gain based on the difference between the calculated input signal gain and the target gain. 23. A timing recovery apparatus for performing the timing recovery method of claim 1. 24. The timing recovery method of claim 1, wherein the generating is performed at a sample decision unit, the calculating is performed at a slope arithmetic unit, and the compensating is performed at a phase compensation unit. 25. The timing recovery method of claim 5, wherein the generating is performed at a sample decision unit, the calculating is performed at a slope arithmetic unit, the compensating and multiplying is performed at a phase compensation unit, and the calculating is performed at a gain arithmetic unit.
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