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:
Jun. 07, 2005
Filed:
Sep. 25, 2001
Ketankumar B. Patel, Lake Forest, CA (US);
Ketankumar B. Patel, Lake Forest, CA (US);
Silicon Laboratories, Inc., Austin, TX (US);
Abstract
According to a disclosed embodiment, the ideal magnitude and phase of an ideal impedance for interfacing a modem with a telephone line is determined. This ideal impedance can be determined in the presence of an external impedance load and associated circuitry, such as an ADSL modem and accompanying POTS splitter. Thereafter, a model for an interface circuit inside the modem is utilized to arrive at an appropriate impedance for an impedance network inside the interface circuit. As an example, the interface circuit can be a DAA circuit inside a V.90 modem. Then, a relationship between the ideal impedance and an input impedance of the impedance network is established. Thereafter, the impedance network is synthesized to that the relationship between the input impedance of the impedance network and the ideal impedance is in fact satisfied. The impedance network can be, for example, a circuit comprising at least one capacitor.