Patent ID: 11916530
Assignee: RF360 SINGAPORE PTE. LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method for filtering an input signal, comprising:
receiving the input signal at a first port of a filter circuit; and
generating a filtered version of the input signal at a second port of the filter circuit, the filter circuit comprising:
a first filter stage having:
a first acoustic wave resonator coupled in a series path between the first port of the filter circuit and the second port of the filter circuit;
a first inductor-capacitor (LC) tank circuit;
a first capacitor coupled between a first terminal of the first acoustic wave resonator and the first LC tank circuit, the first LC tank circuit being coupled between the first capacitor and a reference potential node; and
a second capacitor coupled between a second terminal of the first acoustic wave resonator and the first LC tank circuit; and

one or more other filter stages coupled to the first filter stage, wherein the one or more other filter stages comprise a second filter stage including:
a third capacitor in the series path between the first port and the second port of the filter circuit; and
a second LC tank circuit coupled in the series path between the first port and the second port of the filter circuit.