Amplitude-detecting method and circuit
US6937070B2 · kind B2 · utility
2Cited by
11References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2001 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Sep 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Two all pass filters (11, 12) with 90° phase-shifted different center frequencies are employed to pass an alternating signal S with jitters in the period to generate signals S1 and S2, 90° phase-shifted from each other. A pulse generator (22) generates a sampling pulse Sp by detecting a zero cross point of the phase-shifted signal S2. A full-wave rectifier (21) rectifies full waves of the phase-shifted signal S1 and provides a rectified output to a sampling circuit (23), which extracts a peak value of the amplitude at the timing of the sampling pulse Sp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.