公开(公告)号：US09673782B1

公开(公告)日：2017-06-06

申请号：US15238176

申请日：2016-08-16

Applicant: QUALCOMM Incorporated

Inventor： Shuja Andrabi ,  Rahul Karmaker

IPC: H02K5/00 ,  H03H11/04 ,  H03H11/12 ,  H04L27/00

CPC classification number: H03H11/1256 ,  H03H2210/012 ,  H03H2210/015 ,  H03H2210/025 ,  H03H2210/028 ,  H03H2210/04 ,  H04B1/005

Abstract: Certain aspects of the present disclosure provide methods and apparatus for calibrating a tunable active filter. One example apparatus is a filter circuit that generally includes a tunable active filter comprising at least one amplifier and a first feedback path coupled between an input and an output of the at least one amplifier, the first feedback path comprising at least one switch; and an amplitude limiter coupled to the tunable active filter and comprising at least one transistor disposed in a second feedback path coupled between the input and the output of the at least one amplifier.