| 摘要 |
An electronic circuit and method for providing a d.c. voltage proportional to the randomness of the zero-crossings of an input sine wave signal includes a hard limiter for converting the sine wave to a square wave of the same frequency, a narrow band filter tuned to twice the frequency of the input sine wave signal for removing all the spectral energy except that centered at the second harmonic and a circuit for converting any energy at the output of the filter to a d.c. component which represents the randomness of the zero-crossings (zero-crossing jitter).
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