Patent ID: 11881833
Assignee: QORVO US, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. An integrated passive die comprising:
a substrate;
an input node and an output node; and
radio frequency (RF) filtering circuitry comprising a plurality of LC tank circuits coupled between the input node and the output node, each one of the plurality of LC tank circuits comprising:
an inductor comprising a metal trace over the substrate; and
a capacitor coupled in parallel with the inductor over the substrate, wherein a resonance frequency of the combination of the inductor and the capacitor is less than a self-resonance frequency of the inductor;

wherein for at least one of the plurality of LC tank circuits:
the metal trace of the inductor forms at least one nested spiral between a first inductor node and a second inductor node; and
a buried trace is provided between a termination of the metal trace at an inside of the spiral to the second inductor node; and

wherein the integrated passive die comprises at least one of the following features (i) to (iii):
(i) a length of the buried trace is less than 1 cm;
(ii) the substrate is divided into a first portion and a second portion across a horizontal axis, and a location of each one of the plurality of LC tank circuits is alternated between the first portion and the second portion of the substrate based on the order in which they are coupled between the input node and the output node; and
(iii) an insertion loss of the RF filtering circuitry is less than 5 dB.