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US 8,576,024 B2Granted
Electro-acoustic filter
AssigneeHollinworth Fund, L.L.C.
InventorsJean-Luc Erb, Maha Achour
Life of this patent
Estimating the term…
Abstract
A device includes a plurality of electrode actuated acoustic resonators coupled to form complementary paths to operate as a filter. Each acoustic resonator has an electrical input and an electrical output that contributes to a static capacitance. A compensation impedance is coupled to at least one of the paths to reduce adverse effects from the static capacitances of the acoustic resonators.
Claims24
A device comprising:
- a plurality of electrode actuated acoustic resonators coupled to form complementary paths to operate as a filter, each acoustic resonator having an electrical input and an electrical output;
- and
- a compensation impedance coupled to at least one of the paths,
- wherein at least one of the paths includes a 180° phase shift.
1 more element
A device comprising:
- a plurality of electrode actuated acoustic resonators coupled to form complementary paths to operate as a filter, each acoustic resonator having an electrical input and an electrical output;
- and
- a compensation impedance coupled to at least one of the paths,
- wherein the complementary paths include straight paths and phase shifted paths, and wherein the compensation impedance has a value determined to offset a static capacitance difference that is a function of the sum of static capacitances in the straight paths as compared to the sum of the static capacitances in the phase shifted paths.
1 more element
A device comprising:
- a differential input port;
- a differential output port;
- a plurality of electrode actuated acoustic resonators coupled to form a filter including transverse complementary paths between the differential input port and the differential output port to operate as a bandpass filter, each acoustic resonator being part of a path;
- and
- a compensation impedance coupled to at least one of the paths to reduce an acoustic resonator static capacitance effect in the filter,
- wherein the complementary paths include straight paths and criss-cross paths, and wherein the compensation impedance has a value determined to offset a static capacitance difference that is a function of the sum of static capacitances in the straight paths as compared to the sum of the static capacitances in the criss-cross paths.
3 more elements
A device comprising:
- a differential input port;
- a differential output port;
- a plurality of electrode actuated acoustic resonators coupled to form a filter including transverse complementary paths between the differential input port and the differential output port to operate as a bandpass filter, each acoustic resonator being part of a path;
- and
- a compensation impedance coupled to at least one of the paths to reduce an acoustic resonator static capacitance effect in the filter,
- wherein the compensation impedance comprises a capacitor coupled in parallel with a resonator in one path.
3 more elements
A device comprising:
- differential input port;
- a differential output port;
- a plurality of electrode actuated acoustic resonators coupled to form a filter including transverse complementary paths between the differential input port and the differential output port to operate as a bandpass filter, each acoustic resonator being part of a path;
- and
- a compensation impedance coupled to at least one of the paths to reduce an acoustic resonator static capacitance effect in the filter,
- wherein the compensation impedance comprises a negative capacitance coupled between one path and a complementary criss-cross path.
3 more elements
A method comprising:
- determining a first sum of static capacitances in a first set of acoustic resonator paths in a filter;
- determining a second sum of static capacitances in a second set of acoustic resonator paths in the filter, wherein the second set of paths are complementary to the first set of paths;
- and
- adding a compensation impedance to one of the paths as a function of the first and second sums.
1 more element
Dependencies are inferred from the claim text.