公开(公告)号：US09608515B2

公开(公告)日：2017-03-28

申请号：US14631429

申请日：2015-02-25

Applicant: Analog Devices Global

Inventor： Patrick J Meehan ,  Thomas Conway ,  Adrian Paul Brokaw ,  Donal G. O'Sullivan

IPC: H02M1/44 ,  H02M3/158 ,  H03H7/01 ,  H02M1/15

CPC classification number: H02M1/44 ,  H02M1/15 ,  H02M3/158 ,  H03H7/0153 ,  H03H2007/013 ,  H03H2210/036

Abstract: A circuit and method to filter a signal is provided. The circuit includes a notch filter circuit to receive an input signal and first and second tuning signals and to provide an output signal. The notch filter circuit has an input-output frequency response that includes a stopband region. The stopband region has a center frequency and has an attenuation level that is based at least on a tuning signal. The tunable filter circuit further includes a tuning circuit operable in at least two modes to generate the tuning signal. The at least two modes includes a tuning mode and a filtering mode. The tuning circuit generates the tuning signal such that the attenuation level of the stopband region is greater in the filtering mode than in the tuning mode.