Patent Number: 7,714,643

Title: Tuning of analog filters

Abstract: Apparatus and methods tune analog filters that are parts of systems. When an analog filter is inserted into a system, the analog filter can be difficult to tune because of the difficulty in observing the analog filter's characteristics without being interfered by other circuits in the system. In one embodiment, analog filters are bypassed, and a response is determined. To this response, a time-invariant digital filter is applied to generate a reference response, such as an ideal response. The analog filters are then enabled and adjusted so that the difference between the response of the system and the reference response is minimized. This technique can be applied to arbitrary-order analog filters and can be used even when other circuits affect the observed filter response.

Inventors: Wang; Nanyan (Burnaby, CA), Shin; Soon Sun (Burnaby, CA)

Assignee: PMC-Sierra, Inc.

International Classification: H03K 5/00 (20060101)

Expiration Date: 5/11/12018