System for analyzing the frequency of a signal, a method thereof and a system for measuring the relative phase between two input signals
US9461662B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2016 |
| Grant date | Oct 4, 2016 |
| Priority date | — |
| Expiry date | Jan 15, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R25/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a frequency analysis system, comprising: an analog to digital converter having a sampling frequency fs; a first band pass filter and a second band pass filter, the first band pass filter and the second band pass filter being arranged in parallel with one another; and a feedback loop from an output to an input of the system, wherein the system has an initial center frequency equal to a nominal frequency f0, and a revised center frequency dependent upon the output of the system that is fed back into the input of the system, wherein the transfer functions of the first and second band pass filters have the same poles, and wherein the system is configured such that, when the center frequency fc equals the frequency of the signal fi, the output of the first band pass filter is in phase with the input, the output of the second band pass filter lags the output of the first band pass filter at a constant phase ofand the two band pass titers have equal gain amplitude. There is also provided a method for analyzing the frequency fi of a signal and a phase measurement system based on the frequency analysis system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.