1124 results about "Bulk acoustic wave" patented technology

A component that functions with bulk acoustic waves, particularly a bandpass filter, has an increased number of degrees of design freedom in order to improve the transmission characteristics of the component. The component has BAW resonators coupled acoustically in the vertical and/or lateral direction through common electrodes, coupling layer systems and through the excitation of lateral acoustic modes. Through the acoustic coupling of the resonators, it is possible to create additional pole points in the transfer function so that in this manner, the rejection band characteristics of a bandpass filter can be improved. Through acoustic paths which are added in addition to the electrical connection, the insertion loss can be reduced. Through an acoustic coupling instead of an electrical connection, decoupling between input and output loops of a circuit can be achieved.

A method of wafer scale packaging acoustic resonator devices and an apparatus therefor. The method including providing a partially completed semiconductor substrate comprising a plurality of single crystal acoustic resonator devices provided on a silicon and carbide bearing material, each having a first electrode member, a second electrode member, and an overlying passivation material. At least one of the devices to be configured with an external connection, a repassivation material overlying the passivation material, an under metal material overlying the repassivation material. Copper pillar interconnect structures are then configured overlying the electrode members, and solder bump structures are form overlying the copper pillar interconnect structures.

A suspended film bulk acoustic micro-resonator that includes a beam made of a piezoelectric material fixed to a support and sandwiched between excitation electrodes. The resonator also includes a mechanism modifying limiting conditions of the resonator composed of the excited beam to modify the micro-resonator resonant frequency.

A resonator according to the present invention includes a supporting substrate, a piezoelectric layer, a pair of excitation electrodes, and a bonding layer. The piezoelectric layer is made of a piezoelectric material. The pair of excitation electrodes is formed on the upper surface of the piezoelectric layer so as to excite bulk acoustic waves. The bonding layer has a cavity formed therein so as to face the excitation electrode pair through the piezoelectric layer, and the bonding layer bonds the supporting substrate to the lower surface of the piezoelectric layer.

The present disclosure relates to a first active tunable low-noise RF bandpass filter that includes at least a first transistor element and a tunable frequency selective degeneration circuit coupled to a first non-inverting output of the first transistor element. The first active tunable low-noise RF bandpass filter combines low noise amplifier (LNA) and tunable bandpass filter functionalities into a single active RF bandpass filter. The tunable frequency selective degeneration circuit uses degeneration at frequencies outside of a passband of the active RF bandpass filter to increase feedback, thereby decreasing gain of the active RF bandpass filter. By decreasing the gain, linearity of the active RF bandpass filter may be improved in the presence of strong interfering RF signals, thereby enabling elimination of passive bandpass filter elements, such as surface acoustic wave (SAW) and bulk acoustic wave (BAW) filters, without degrading reception of in-band RF signals.

A filtering circuit with BAW type acoustic resonators having at least a first quadripole and a second quadripole connected in cascade, each quadripole having a branch series with a first acoustic resonator of type BAW and a branch parallel with each branch having an acoustic resonator of type BAW, the first acoustic resonator having a frequency of resonance series approximately equal to the frequency of parallel resonance of the second acoustic resonator, the branch parallel of the first quadripole having a first capacitance connected in series with the second resonator and, in parallel with the capacitance, a first switching transistor to short circuit the capacitance.

An array of piezoelectric resonators used in a sensor device in order to identify chemical and biological agents. The resonators can operate as bulk acoustic wave (BAW), surface acoustic wave (SAW), or Love mode devices. The sensor device integrates gravimetric, calorimetric, thermal gravimetric, voltage gravimetric and optical detection methods into one sensor system, improving the accuracy of identifying hazardous agents. For gravimetric detection, dual-mode resonators provide simultaneous calorimetric and gravimetric data, one type from each mode. Resonators with heaters on the surfaces will provide thermal gravimetric data. An optical detector can be used to analyze the optical signal from the surface of a coated resonator. Additionally, voltage gravimetric measurements can be made with an electric field set up between the resonator and an external electrode. Thermal voltage gravimetric measurements can be made by adding an integrated heater on the resonator with an external electrode. An alarm can be activated upon the identification of a hazardous agent. The sensor device can utilize other valuable information, including traceable time, GPS location, and variables related to temperature, humidity, air speed, and air direction.

An RF circuit device using modified lattice, lattice, and ladder circuit topologies. The devices can include four resonator devices and four shunt resonator devices. In the ladder topology, the resonator devices are connected in series from an input port to an output port while shunt resonator devices are coupled the nodes between the resonator devices. In the lattice topology, a top and a bottom serial configurations each includes a pair of resonator devices that are coupled to differential input and output ports. A pair of shunt resonators is cross-coupled between each pair of a top serial configuration resonator and a bottom serial configuration resonator. The modified lattice topology adds baluns or inductor devices between top and bottom nodes of the top and bottom serial configurations of the lattice configuration. These topologies may be applied using single crystal or polycrystalline bulk acoustic wave (BAW) resonators.

The film bulk acoustic wave resonator includes a laminate structure composed of a piezoelectric layer, and first and second electrode layers interposing at least part of the piezoelectric layer, in which the first metal electrode is dispersively formed on an electrode plane facing the second metal electrode, and a gap is formed in a substrate correspondingly to the laminate-structured resonance part. Except for an area of a wire electrode electrically connected to the first electrode layer and an area of a wire electrode electrically connected to the second electrode layer, the piezoelectric layer, first electrode layer and second electrode layer do not come in contact with the insulating substrate but are supported on a hollow. Also, a prop is formed in the gap to support the laminate structure.

A bulk acoustic wave resonator structure that isolates the core resonator from both environmental effects and aging effects. The structure has a piezoelectric layer at least partially disposed between two electrodes. The structure is protected against contamination, package leaks, and changes to the piezoelectric material due to external effects while still providing inertial resistance. The structure has one or more protective elements that limit aging effects to at or below a specified threshold. The resonator behavior is stabilized across the entire bandwidth of the resonance, not just at the series resonance. Examples of protective elements include a collar of material around the core resonator so that perimeter and edge-related environmental and aging phenomena are kept away from the core resonator, a Bragg reflector formed above or below the piezoelectric layer and a cap formed over the piezoelectric layer.

Various aspects of the present invention relate to the control and manipulation of fluidic species, for example, in microfluidic systems. In one set of embodiments, droplets may be sorted using surface acoustic waves. The droplets may contain cells or other species. In some cases, the surface acoustic waves may be created using a surface acoustic wave generator such as an interdigitated transducer, and/or a material such as a piezoelectric substrate. The piezoelectric substrate may be isolated from the microfluidic substrate except at or proximate the location where the droplets are sorted, e.g., into first or second microfluidic channels. At such locations, the microfluidic substrate may be coupled to the piezoelectric substrate (or other material) by one or more coupling regions. In some cases, relatively high sorting rates may be achieved, e.g., at rates of at least about 1,000 Hz, at least about 10,000 Hz, or at least about 100,000 Hz, and in some embodiments, with high cell viability after sorting.

Provided is a highly reliable acoustic wave device wherein deterioration of electrical characteristics due to deformation of a protective cover is suppressed. A method for manufacturing such acoustic wave device is also provided. The acoustic wave device has a piezoelectric substrate 1 propagating an acoustic wave; an excitation electrode arranged on a first main surface of the piezoelectric substrate 1; a columnar outside connection-use electrode 10 electrically connected to the excitation electrode; a protective cover 17 having a hollow accommodating space 8 in which the excitation electrode is accommodated on the first main surface; and a conductive layer 18 connected to the electrode 10 on the protective cover 17.

A filter circuit includes at least one series resonator having a first terminal and a second terminal, where the first and second terminals of the at least one series resonator are coupled to an input and an output of the filter circuit, respectively. The filter circuit further includes at least one shunt resonator having a first terminal and a second terminal, where the first terminal of the at least one shunt resonator is coupled to the input of the filter circuit and the second terminal of the at least one shunt resonator is coupled to ground. A polarity of the first terminal of the at least one series resonator and a polarity of the first terminal of the at least one shunt resonator are selected so as to reduce harmonic signal generation and other types of distortion in the filter circuit.

In accordance with a representative embodiment, a bulk acoustic wave (BAW) resonator structure, comprises: a first BAW resonator comprising a first lower electrode, a first upper electrode and a first piezoelectric layer disposed between the first lower electrode and the first upper electrode; a second BAW resonator comprising a second lower electrode, a second upper electrode and a second piezoelectric layer disposed between the second lower electrode and the second upper electrode; an acoustic coupling layer disposed between the first BAW resonator and the second BAW resonator; and a bridge disposed between the first lower electrode of the first BAW resonator and the second upper electrode of the second BAW resonator.

Titanium-tungsten alloy based mirrors and electrodes in bulk acoustic wave devices simplify processing by eliminating the need for adhesion, barrier and seed layers, and preserve the advantages of tungsten layers. Alternate layers of high and low acoustic impedance materials are use, wherein the high acoustic impedance layers are titanium-tungsten alloy layers, preferably deposited by physical vapor deposition, and isotropically patterned with a wet etch. SiO₂ is preferably used for the low acoustic impedance layers, though other low acoustic impedance materials may be used if desired. Electrodes and loads may also be a Titanium-tungsten alloy. Titanium-tungsten alloys in the range of 3 to 15 percent of titanium by weight are preferred.

A thin film bulk acoustic wave (BAW) resonator structure and filter which can be fabricated by inexpensive manufacturing techniques and in smaller size than conventional such products are to be provided. The BAW resonator structure and filter have a substrate, a first BAW resonator placed over the substrate, an acoustic reflection layer placed over the first BAW resonator and a second BAW resonator placed over the acoustic reflection layer, and the acoustic reflection layer is electroconductive. Herein, the acoustic reflection layer constitutes a first electrode, and this first electrode electrically connects and acoustically separates the first BAW resonator and the second BAW resonator.