US 11,791,793 B2
Hybrid acoustic LC filter with harmonic suppression
Weimin Sun, Santa Rosa Valley, CA (US); Hai H. Ta, Pomona, CA (US); and Bo Pan, Irvine, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Jul. 17, 2019, as Appl. No. 16/514,806.
Claims priority of provisional application 62/700,148, filed on Jul. 18, 2018.
Claims priority of provisional application 62/700,142, filed on Jul. 18, 2018.
Claims priority of provisional application 62/700,146, filed on Jul. 18, 2018.
Prior Publication US 2020/0028481 A1, Jan. 23, 2020
Int. Cl. H03H 7/46 (2006.01); H04B 1/10 (2006.01); H03H 9/60 (2006.01); H03H 9/72 (2006.01); H03H 9/02 (2006.01); H03H 9/205 (2006.01); H03H 9/70 (2006.01); H03H 9/64 (2006.01); H03H 7/01 (2006.01); H03H 9/54 (2006.01); H04B 1/40 (2015.01); H04B 1/04 (2006.01); H01Q 1/50 (2006.01); H04L 5/14 (2006.01)
CPC H03H 7/463 (2013.01) [H01Q 1/50 (2013.01); H03H 7/0115 (2013.01); H03H 7/0138 (2013.01); H03H 7/1758 (2013.01); H03H 7/1766 (2013.01); H03H 9/02007 (2013.01); H03H 9/205 (2013.01); H03H 9/542 (2013.01); H03H 9/605 (2013.01); H03H 9/64 (2013.01); H03H 9/706 (2013.01); H03H 9/725 (2013.01); H04B 1/0475 (2013.01); H04B 1/1036 (2013.01); H04B 1/40 (2013.01); H04L 5/1461 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multiplexer comprising:
a first filter configured to filter a radio frequency signal, the first filter including a hybrid passive/acoustic filter and a non-acoustic LC filter cascaded with the hybrid passive/acoustic filter, the hybrid passive/acoustic filter including at least a first acoustic resonator in parallel with a first inductor, the first acoustic resonator and the first inductor in series with a second inductor and a second acoustic resonator in series with a third inductor, and at least a first non-acoustic passive component having at least a first capacitor in parallel with a fourth inductor, the first capacitor and the fourth inductor connected in parallel with the second acoustic resonator, a second non-acoustic passive component having at least a second in parallel with a fifth inductor, the second capacitor and the fifth inductor further connected in parallel with the first acoustic resonator, and the non-acoustic LC filter configured to suppress a harmonic of the radio frequency signal, the non-acoustic LC filter including a first LC resonant circuit connected to a series LC tank, a second LC resonant circuit connected to the series LC tank, and a first bridge capacitor coupled to an input and the series LC tank, and a second bridge capacitor coupled to the first LC resonant circuit and the series LC tank; and
a second filter coupled to the first filter at a common node.