| 摘要 |
<p>A method and apparatus for correcting for deterministic jitter in a sequential sampling timebase, a sample time for the sequential sampling timebase being defined by a time duration of a combination of a fine analog delay and coarse delay determined by the counting of digital pulses of a stable clock. The value of the fine analog delay is held at a substantially constant nominal rate during the duration of the counting of the digital clock. In the method a time difference between a trigger at which the fine analog delay starts measuring time and the occurrence of a digital pulse of the stable clock being used to count the coarse delay is measured. An input waveform is sampled at a sample time having a nominal delay time. After sampling, a desired compensation time is provided for the sample of the input waveform in accordance with a plurality of combinations of three independent variables defining a calibration table, the calibration table having independent variables including the time interval defined by the fine analog delay, the time interval defined by the coarse delay, and the time interval measured between the trigger at which the fine analog delay starts measuring time and the occurrence of the digital pulse of the stable clock being used to count the coarse delay, and the waveform is reconstructed by shifting the delay time of sampled value of the input waveform from its nominal delay time in accordance with a value defined by the calibration table.</p> |
