Second order filter with low sensitivity to component values and a method for designing the same
US5959510A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jun 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/126
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention provides a second order filter with low sensitivity to component values and a method for designing the filter. The filter is impedance tapered by increasing the impedance of the filter circuit from left to right so as to minimize loading on the first ladder section and to maximize the pole quality factor of the first section. The filter is designed so that the value of the resistor of the second ladder section of the filter is equal to the resistor value of the first section multiplied by a scaling factor r, which is greater than 1. The capacitor of the second ladder section has a value equal to the value of the capacitor of the first ladder section divided by a tapering factor .rho., which is also greater than 1. In accordance with the preferred embodiment, the capacitor and resistor tapering factors are equal, i.e., r=.rho.>1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.