Method and apparatus for testing frequency-dependent electrical circuits
US6411101B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2001 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Sep 22, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Electrical filter circuits are tested by connecting to the filter inputs without the need to connect to the filter outputs or to disconnect the outputs from a load. A signal generator of known source resistance applies a.c. signals successively over a range of frequencies to the filter inputs, and a voltmeter monitors the voltage across the filter inputs. Different types of filters have different characteristic shapes for the voltage/frequency curve, and processing is applied to the measured results in a computer to determine the location of inflections in the curve and other characteristics of the curve. Methods are disclosed for determining the values of the individual sub-components of the filter. Where the filter is an L-section filter, an interactive process is applied to successively improve the accuracy of the component value determinations. Using the techniques described enables the insertion loss of the filter also to be readily calculated by the computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.