The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1999
Filed:
Jun. 13, 1997
George S Moschytz, Zurich, CH;
Globespan Technologies, Inc., Red Bank, NJ (US);
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.