Coherent sampling digitizer system
US5708432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/31922
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digitizing system coherently samples an input signal of frequency F.sub.t and generates an output data sequence representing magnitudes of N successive samples. The digitizing system generates a timing signal by frequency dividing a clock signal of frequency F.sub.MCLK by an integer factor K and supplies the timing signal to a digitizer. The digitizer coherently samples the input signal N times over M cycles of input signal to produce an N-term data sequence representing one cycle of the input signal. The timing signal frequency sets the digitizer sampling rate. The digitizing system includes a computer programmed to execute an algorithm for finding an appropriate value for K so that the system substantially achieves coherent sampling of the input signal despite limitations in allowable ranges of K, M and N. The algorithm searches a Farey series to locate terms of the form P/Q from which it may derive candidate values of K (K=Q.sub.i *J), M (M=P*J) and N (N=Q.sub.i), wherein P and Q are relatively prime integers, J is an integer greater than 0 and Q.sub.i is an integer factor of Q. The algorithm locates the particular Farey series term most closely approximating the ratio F.sub.t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.