Mobile communication device configured with a single crystal piezo resonator structure

Patent metadata

Field	Value
Publication number	US-9716581-B2
Application number	US-201414449001-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Jul 31, 2014
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A mobile communication system. The system has a housing comprising an interior region and an exterior region and a processing device provided within an interior region of the housing. The system has an rf transmit module coupled to the processing device, and configured on a transmit path. The system has a transmit filter provided within the rf transmit module. In an example, the transmit filter comprises a diplexer filter comprising a single crystal acoustic resonator device.

First claim

What is claimed is:

1. A mobile communication system comprising:
a housing comprising an interior region and an exterior region;
a display coupled to the housing;
a processing device provided within the interior region of the housing;
a filter diplexer module comprising
an rf transmit module coupled to the processing device and configured on a transmit path, wherein the rf transmit module includes a transmit filter having one or more diplexer filter devices, each of the one or more diplexer filter devices comprising a single crystal acoustic resonator device;
an rf receive module coupled to the processing device and configured on a receive path, wherein the rf receive module includes a receive filter;

an antenna coupled to the rf transmit module and the rf receive module;
an antenna control device coupled to the receive path and the transmit path and configured to select either the receive path or the transmit path, wherein the antenna control device is coupled to the filter diplexer module;
a power amplifier module coupled to the processing device and the filter diplexer module, the power amplifier module being configured on the transmit path and the receive path, wherein the power amplifier module comprises a plurality of communication bands, each communication band having a power amplifier, wherein the one or more diplexer filter devices are configured to one or more of the plurality of communication bands;
a band-to-band isolation between any pair of adjacent communication bands in the plurality of communication bands characterizing the transmit filter such that a difference between a pass band to reject band as measured in relative decibels (dBc) is greater than 10 dBc and less than 100 dBc;
an insertion loss characterizing the transmit filter, the insertion loss being less than 3 dB and greater than 0.5 dB; and
a center frequency configured to define the pass band;
wherein each single crystal acoustic resonator devices of the diplexer filter devices comprises:
a substrate having a surface region;
a first electrode material coupled to a portion of the substrate;
a reflector region configured to the first electrode material;
a single crystal capacitor dielectric material having a thickness of greater than 0.4 microns and overlying an exposed portion of the surface region and coupled to the first electrode material, the single crystal capacitor dielectric material being characterized by a dislocation density of less than 10 12 defects/cm 2 ; and
a second electrode material overlying the single crystal capacitor dielectric material.

2. The system of claim 1 wherein the single crystal capacitor material is selected from at least one of GaN, AlN, AlGaN, InN, BN, or other group III nitrides or at least one of a single crystal oxide including a high K dielectric, ZnO, or MgO.

3. The system of claim 1 wherein the single crystal capacitor dielectric material is characterized by a surface region of at least 200 microns by 200 microns; and wherein the single crystal capacitor dielectric material is configured in a first strain state to compensate to the substrate; wherein the single crystal capacitor dielectric material is deposited overlying the exposed portion of the substrate.

4. The system of claim 1 wherein the first electrode material and the single crystal capacitor dielectric material comprises a first interface region substantially free from an oxide bearing material.

5. The system of claim 1 further comprising a nucleation material provided between the single crystal capacitor dielectric material and the first electrode material; and further comprising a capping material provided between the single crystal capacitor dielectric material and the second electrode material.

6. The system of claim 1 wherein the single crystal capacitor dielectric material is characterized by a FWHM of less than one degree; and further comprising a parameter derived from a two port analysis.

7. The system of claim 1 wherein the first electrode material comprises a first electrode structure configured and routed to a vicinity of a plane parallel to a contact region coupled to the second electrode material.

8. The system of claim l wherein the surface region of the substrate is bare and exposed crystalline material; and wherein the single crystal capacitor dielectric material is configured to propagate a longitudinal signal at an acoustic velocity of 6000 meters/second and greater; and further comprising a first contact coupled to the first electrode material and a second contact coupled to the second electrode material such that each of the first contact and the second contact are configured in a co-planar arrangement.

9. The system of claim 1 wherein the semiconductor substrate is selected from a silicon, a gallium arsenide, gallium nitride, aluminum nitride, an aluminum oxide, or others.

10. A mobile communication system comprising:
a housing comprising an interior region and an exterior region;
a display coupled to the housing;
a processing device provided within the interior region of the housing;
an rf transmit module coupled to the processing device, and configured on a transmit path;
an rf receive module coupled to the processing device, and configured on a receive path;
an antenna coupled to the rf transmit module and the rf receive module;
an antenna control device coupled to the receive path and the transmit path, and configured to select either the receive path or the transmit path;
a receive filter provided within the rf receive module;
a low noise amplifier device coupled to the rf receive module;
a transmit filter provided within the rf transmit module, the transmit filter having a diplexer filter comprising a single crystal acoustic resonator device; and
a power amplifier module coupled to the rf transmit module, and configured to drive a signal through the transmit path to the antenna;
wherein the power amplifier module includes a plurality of communication bands numbered from 1 to N, where N is an integer greater than 2 and less than 50, wherein each of the communication bands includes a power amplifier, wherein one or more of the communication bands is coupled to the diplexer filter;
a switching device coupled to one or more of the plurality of communication bands and to an output impedance matching circuit, wherein the output impedance matching circuit is coupled to the diplexer filter;
a band-to-band isolation characterizing the transmit filter such that a difference between a pass band to reject band as measured in relative decibels (dBc) is greater than 10 dBc and less than 100 dBc;
an insertion loss characterizing the transmit filter, the insertion loss being less than 3 dB and greater than 0.5 dB; and
a center frequency configured to define the pass band; and
wherein the single crystal acoustic resonator device comprises:
a substrate having a surface region;
a first electrode material coupled to a portion of the substrate;
a single crystal capacitor dielectric material having a thickness of greater than 0.4 microns and overlying an exposed portion of the surface region and coupled to the first electrode material, the single crystal capacitor dielectric material being characterized by a dislocation density of less than 10 12 defects/cm 2 ; and
a second electrode material overlying the single crystal capacitor dielectric material;

wherein the single crystal capacitor dielectric material is characterized by a surface region of at least 200 microns by 200 microns; and wherein the single crystal capacitor dielectric material is configured in a first strain state to compensate to the substrate; wherein the single crystal capacitor dielectric material is deposited

Assignees

• Akoustis Inc

Inventors

• Shealy Jeffrey B

Classifications

• H04B1/44 Primary

  Transmit/receive switching · CPC title

• H04L5/08 Primary

  each combination of signals in different channels being represented by a fixed frequency · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04B1/04

  Circuits · CPC title

• H03H3/02 Primary

  for the manufacture of piezoelectric or electrostrictive resonators or networks (H03H3/08 takes precedence) · CPC title