Patent · US Active

Ring detection and snoop circuit

US7536005B2 · kind B2 · utility

0Cited by

2References

19Claims

0Family size

Assignee

Silicon Laboratories Inc. · US

Inventors

Wayne T. Holcombe · Mountain View, US
Vitor Pereira · Austin, US
Tiago Marques · Alvalade, PT

Key dates

Filing date	Dec 1, 2005
Grant date	May 19, 2009
Priority date	—
Expiry date	Jan 11, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04M11/066
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A ring detect circuit is shown that includes a regenerative latch configured to be coupled to a telephone line. The regenerative latch is configured to generate a fast transient signal in response to a ring signal on the telephone line. The latch is coupled to an isolation transformer through a capacitor. The fast transient passes across the capacitor and through the transformer. A comparator detects the fast transient and, responsive thereto, generates a ring detect signal.

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