Multi-band impedance tuners using weakly-coupled LC resonators
First Claim
1. A radio frequency (RF) filter structure, comprising:
- a first terminal;
a second terminal;
a first tunable RF filter path defined between the first terminal and the second terminal, wherein the first tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a first frequency and wherein the first tunable RF filter path comprises a first subset of the plurality of resonators wherein at least a pair of the first subset of the plurality of resonators are weakly coupled to one another;
a second tunable RF filter path defined between the first terminal and the second terminal, wherein the second tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a second frequency and wherein the second tunable RF filter path comprises a second subset of the plurality of resonators; and
wherein the first subset of the plurality of resonators and the second subset of the plurality of resonators are not mutually exclusive.
2 Assignments
0 Petitions
Accused Products
Abstract
Radio frequency (RF) filter structures and related methods and RF front-end circuitry are disclosed. In one embodiment, an RF filter structure includes a first terminal and a first tunable RF filter path defined between the first terminal and a second terminal. The first tunable RF filter path is tunable to provide impedance matching between the first terminal and the second terminal at a first frequency. The first frequency may be provided within a first frequency band. Additionally, the RF filter structure includes a second tunable RF filter path defined between the first terminal and the second terminal. The second tunable RF filter path is tunable to provide impedance matching between the first terminal and the second terminal at a second frequency. The second frequency may be within a second frequency band. In this manner, the RF filter structure is configured to provide impedance tuning for multiple impedance bands simultaneously.
138 Citations
25 Claims
-
1. A radio frequency (RF) filter structure, comprising:
-
a first terminal; a second terminal; a first tunable RF filter path defined between the first terminal and the second terminal, wherein the first tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a first frequency and wherein the first tunable RF filter path comprises a first subset of the plurality of resonators wherein at least a pair of the first subset of the plurality of resonators are weakly coupled to one another; a second tunable RF filter path defined between the first terminal and the second terminal, wherein the second tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a second frequency and wherein the second tunable RF filter path comprises a second subset of the plurality of resonators; and wherein the first subset of the plurality of resonators and the second subset of the plurality of resonators are not mutually exclusive. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. Radio frequency (RF) front-end circuitry, comprising:
-
a first terminal; a second terminal; a first tunable RF filter path defined between the first terminal and the second terminal, wherein the first tunable RF filter path comprises a pair of weakly coupled resonators and the first tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a first frequency; and a third resonator coupled to one of the pair of weakly coupled resonators so as to provide a first subpath connected to the first tunable RF filter path; a first cross-coupling capacitive structure operable to provide a first variable capacitance and coupled in the first subpath between the one of the pair of weakly coupled resonators and the third resonator; and a control circuit configured to tune the first tunable RF filter path to provide impedance matching between the first terminal and the second terminal at the first frequency by adjusting the first variable capacitance so as to adjust a phase of the first tunable RF filter path and provide the impedance matching between the first terminal and the second terminal at the first frequency. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification