Patent · US Active

Digital signal filter

US8565709B2 · kind B2 · utility

1Cited by

4References

22Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Scott Mullins · Gilroy, US
Timothy M. Johnson · Algonquin, US
Yehonatan Perez · Menlo Park, US

Key dates

Filing date	Feb 9, 2011
Grant date	Oct 22, 2013
Priority date	—
Expiry date	Dec 19, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH03H7/1758
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A passive filter circuit filters an input signal to attenuate an undesired frequency. The passive filter circuit includes a first stage and a second stage. The input to the first stage is the input signal. The first stage includes a first inductor and a first branch coupled to the output of the first inductor. The first branch includes a first capacitor and a second inductor. The first stage is coupled to the second stage. The second stage includes a third inductor and a second branch coupled to the output of the third inductor. The second branch includes a second capacitor. Other embodiments are also described and claimed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.