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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10476482 B1

PDFFull Text
Date of Patent:
Nov. 12, 2019

Filed:

Nov. 20, 2017

Filters including loop circuits for phase cancellation

Applicant:

Skyworks Solutions, Inc., Woburn, MA (US);

Inventors:

Satoshi Niwa, Taito-Ku, JP;

Yoshiaki Ando, Yokosuka, JP;

Hiroyuki Nakamura, Osaka-Fu, JP;

Assignee:

SKYWORKS SOLUTIONS, INC., Woburn, MA (US);

Attorney:

Lando & Anastasi, LLP

Primary Examiner:

Robert J Pascal

Assistant Examiner:

Jorge L Salazar, Jr

Int. Cl.
CPC ...
H03H 9/64 (2006.01); H03H 9/54 (2006.01); H03L 7/093 (2006.01); H01P 1/205 (2006.01); H03H 9/02 (2006.01); H01P 1/20 (2006.01); H04B 1/10 (2006.01); H01L 41/047 (2006.01); H03H 9/56 (2006.01); H03H 9/60 (2006.01); H03H 9/70 (2006.01); H04B 1/04 (2006.01); H04B 1/18 (2006.01); H04B 1/525 (2015.01); H01P 1/213 (2006.01);
U.S. Cl.
CPC ...
H03H 9/6483 (2013.01); H01L 41/0471 (2013.01); H01P 1/205 (2013.01); H01P 1/2005 (2013.01); H03H 9/02047 (2013.01); H03H 9/542 (2013.01); H03H 9/547 (2013.01); H03H 9/568 (2013.01); H03H 9/605 (2013.01); H03H 9/6436 (2013.01); H03H 9/706 (2013.01); H03L 7/093 (2013.01); H04B 1/0458 (2013.01); H04B 1/1036 (2013.01); H04B 1/18 (2013.01); H04B 1/525 (2013.01); H01P 1/213 (2013.01);
Abstract

Aspects and examples provide improvement in the attenuation level near the passband within the stopband of the bandpass-type filter using a ladder-type circuit formed by a BAW resonator. In one example the filter includes a ladder-type circuit formed by a bulk acoustic wave (BAW) resonator, and a loop circuit connected between two distinct points on a signal path extending from an input to an output of the ladder-type circuit for phase-cancellation of signals at the two distinct points. The two distinct points may be the input and the output of the ladder-type circuit. The loop circuit may include a SAW resonator or a BAW resonator. The BAW resonator may be a film bulk acoustic resonator (FBAR) or solidly mounted resonator (SMR).

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