Multiplexer with dies of different acoustic velocity
An acoustic wave device is disclosed. The acoustic wave device can include a first multiplexer that has a first portion and a second portion. The acoustic wave device can include a second multiplexer that has a third portion and a fourth portion. The first portion and the third portion are formed in a first die. The second portion and the fourth portion are formed in a second die. A difference between a velocity of an acoustic wave that is generated by the first die and a velocity of an acoustic wave that is generated by the second die is at least 200 m/s.
1 . An acoustic wave device comprising:
a first die with a multilayer piezoelectric substrate, the first die including a first portion with a first transmission filter and a second portion with a second transmission filter, the first die further including a first multilayer interdigital transducer having at least one layer with a first thickness greater than 0.06L 1 where L 1 is a wavelength of a first acoustic wave generated by the first die;
a second die that is a temperature compensated surface acoustic wave die, the second die including a third portion with a first reception filter and a fourth portion with a second reception filter, the second die further including a second multilayer interdigital transducer having at least one layer with a second thickness less than 0.06L 2 , where L 2 is a wavelength of a second acoustic wave generated by the second die, a difference between a velocity of the first acoustic wave and a velocity of the second acoustic wave being at least 200 m/s;
a first antenna common node connected between the first transmission filter on the first die and the first reception filter on the second die; and
a second antenna common node connected between the second transmission filter on the first die and the second reception filter on the second die.
2 . The acoustic wave device of claim 1 wherein the first portion includes resonators of the first transmission filter.
3 . The acoustic wave device of claim 2 wherein the second portion includes resonators of the second transmission filter.
4 . The acoustic wave device of claim 3 wherein the third portion includes resonators of the second reception filter, and the fourth portion includes resonators of a second reception filter.
5 . The acoustic wave device of claim 3 wherein the first die includes a resonator of the first transmission filter.
6 . The acoustic wave device of claim 3 wherein the second die includes a resonator of the first reception filter.
7 . The acoustic wave device of claim 3 wherein the first reception filter includes a multimode longitudinally coupled surface acoustic wave resonator.
8 . A front end module including the acoustic wave device of claim 1 and a first antenna coupled to the first antenna common node and a second antenna coupled to the second antenna common node.
9 . A mobile device including the front end module of claim 8 and a user interface.
10 . The acoustic wave device of claim 1 wherein the at least one layer of the first multilayer interdigital transducer with the first thickness comprises molybdenum.
11 . The acoustic wave device of claim 1 wherein the second die includes a temperature compensation layer.
12 . The acoustic wave device of claim 1 wherein the first die is configured such that an acoustic wave generated by the first die has a velocity greater than 3800 m/s.
13 . The acoustic wave device of claim 1 wherein the second die is configured such that an acoustic wave generated by the second die has a velocity less than 3500 m/s.
14 . The acoustic wave device of claim 1 wherein a velocity of an acoustic wave generated by the first die is at least 200 m/s greater than a velocity of an acoustic wave generated by the second die.
15 . An acoustic wave device comprising:
a first die with a multilayer piezoelectric substate, the first die including a first portion with a first transmission filter and a second portion with a second transmission filter, the first die further including a first multilayer interdigital transducer having at least one layer with a first thickness greater than 0.06L 1 , where L 1 is a wavelength of a first acoustic wave generated by the first die; and
a second die that is a temperature compensated surface acoustic wave die, the second die including a third portion with a first reception filter connected to the first transmission filter and a fourth portion with a second reception filter connected to the second transmission filter, the second die further including a second multilayer interdigital transducer having at least one layer with a second thickness less than 0.06L 2 , where L 2 is a wavelength of a second acoustic wave generated by the second die, a difference between a velocity of the first acoustic wave and a velocity of the second acoustic wave being at least 5% of the velocity of the first acoustic wave generated by the first die.
16 . The acoustic wave device of claim 15 wherein the first portion includes resonators of the first transmission filter, the second portion includes resonators of the second transmission filter, the third portion includes resonators of the first reception filter, and the fourth portion includes resonators of the second reception filter.
17 . The acoustic wave device of claim 16 wherein the first reception filter includes a multimode longitudinally coupled surface acoustic wave resonator.
18 . The acoustic wave device of claim 15 wherein the at least one layer of the first multilayer interdigital transducer with the first thickness comprises molybdenum.
19 . The acoustic wave device of claim 15 wherein the first die is configured such that an acoustic wave generated by the first die has a velocity greater than 3800 m/s.
20 . The acoustic wave device of claim 15 wherein a velocity of an acoustic wave generated by the first die is at least 200 m/s greater than a velocity of an acoustic wave generated by the second die.