发明名称 |
Method and apparatus for constructing a synchronous signal diagram from asynchronously sampled data |
摘要 |
A method a low cost and production-integrable technique for providing a signal diagram. The data signal is edge-detected and asynchronously sampled (or alternatively a clock signal is latched). The data signal or a second signal is compared to a settable threshold voltage and sampled. The edge and comparison data are folded according to a swept timebase to find a minimum jitter period. The crossing of the signal diagram edges is determined from a peak of a histogram of the folded edge data. A histogram of ratios of the sample values versus displacement from the position of the crossing location is generated for each threshold voltage. The technique is repeated over a range of settable threshold voltages. Then, the ratio counts are differentiated across the histograms with respect to threshold voltage, from which a signal diagram is populated.
|
申请公布号 |
US7383160(B1) |
申请公布日期 |
2008.06.03 |
申请号 |
US20060427860 |
申请日期 |
2006.06.30 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
CRANFORD, JR. HAYDEN C.;GEBARA FADI H.;SCHAUB JEREMY D. |
分类号 |
G06F19/00 |
主分类号 |
G06F19/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|