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7620094 |
Spread spectrum clock generator
Disclosed is a spread spectrum clock generator which includes: a first delay control type oscillator that variably controls an oscillation period at a control period interval according to a control...
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7606294 |
Channel quality estimation method and receiving apparatus
Channel quality can be detected accurately in a wireless transmission system such as an HSDPA method. In the case of estimating a channel quality of a signal transmitted by a Code Division...
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7593450 |
Dynamic frequency hopping
A frequency hopping communications system is disclosed. A server is adapted to have one or more radio head interface modules and a call processing software module. The call processing software...
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7589451 |
Surface acoustic wave device
An object of the invention is to provide a SAW device where a device size is made smaller than that of a conventional structure, has a high Q value, and is excellent in a frequency temperature...
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7586992 |
Apparatus and method for channel estimation and cyclic prefix reconstruction in an OFDM-STBC mobile communication system
An apparatus and method for channel estimation and CP reconstruction in an OFDM-STBC mobile communication system are provided. An ISI canceller cancels ISI signal components from first and second...
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7586972 |
Code division multiple access enhanced capacity system
A code division multiple access (CDMA) communication system using spread spectrum signaling over a communication bandwidth uses two different signal spectra generated using two different respective...
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7580444 |
Frequency hopping communication system
The invention provides an adaptive frequency hopping spread-spectrum (FHSS) transmission system and method, which efficiently utilizes available transmission bandwidth, whilst providing robustness...
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7579932 |
Resonator SAW filter having a control interdigital transducer between input and output interdigital transducers
A longitudinally coupled multi-mode SAW resonator filter includes input and output interdigital transducers (IDTs) with a control IDT therebetween to control a state of the surface acoustic wave....
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7579928 |
Surface acoustic wave device and communication device
A surface acoustic wave device includes front stage and rear stage surface acoustic wave elements, a signal wiring connecting between the front stage and rear stage surface acoustic wave elements,...
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7573354 |
Duplexer and ladder type filter
A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, and a second filter connected to the antenna terminal. At least one of the first filter and the second...
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7564174 |
Acoustic wave device and filter
An acoustic wave device includes a piezoelectric substrate, a first dielectric film provided on the piezoelectric substrate, electrodes that are provided on the first dielectric film and excite an...
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7555824 |
Method for large scale integration of quartz-based devices
Methods for integrating quartz-based resonators with electronics on a large area wafer through direct pick-and-place and flip-chip bonding or wafer-to-wafer boding using handle wafers are...
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7555029 |
Method for decoding a plurality of standard radio waves and standard radio wave receiver
A method and a standard radio wave receiver for receiving a plurality of standard radio waves respectively having signal configurations in accordance with respective specifications which define...
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7554428 |
Boundary acoustic wave device comprising Ni diffused in Au and method for manufacturing the same
A boundary acoustic wave device includes a first medium, a second medium, and an IDT electrode disposed at an interface between the first medium and the second medium, the IDT electrode having an...
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7554242 |
Surface acoustic wave chip, surface acoustic wave device, and manufacturing method for implementing the same
A surface acoustic wave chip formed with an inter-digital transducer entirely over a piezoelectric substrate. In the surface acoustic wave chip, the inter-digital transducer is extended to a rim of...
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7551665 |
Ultra wideband receiver architecture using high order Gaussian pulses and method of operation
An ultra wideband (UWB) receiver system operable to process a high order Gaussian pulse includes an integrator group, a correlator circuit and a comparator circuit. The integrator group includes an...
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7538637 |
Acoustic wave transducer with transverse mode suppression
An acoustic wave transducer includes an acoustic track having electrode fingers for different electrodes. The electrode fingers engage to form exciting finger pairs. The acoustic track also...
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7528685 |
Lamb wave type high frequency device
A lamb wave type high frequency device includes: an interdigital transducer (IDT) electrode having an electrode finger interdigitated therein; a pair of reflectors having an electrode finger and...
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7528684 |
Edge chirping within series connected interdigitated transducers
The present invention provides a surface acoustic wave (SAW) architecture wherein two acoustic reflectors are formed on a piezoelectric substrate to define an acoustic cavity between the acoustic...
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7528683 |
Balanced acoustic wave filter device
A surface acoustic wave filter device includes an unbalanced terminal, first and second balanced terminals, and first, second and third IDTs. One end of the first IDT and one end of the third IDT...
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7522894 |
Radio receiving apparatus
A radio receiving apparatus includes two receiving antennas, two upstream RF amplifiers, a SAW filter having two input IDTs and an output IDT, a downstream RF amplifier, and a detector circuit. The...
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7522020 |
Boundary acoustic wave device and method for manufacturing boundary acoustic wave device
A boundary acoustic wave device has a small thickness, which is suitable for thin apparatuses, and can be manufactured at low cost. The boundary acoustic wave device includes a first IDT electrode...
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7519097 |
Spread-signal multiplexing circuit
The invention relates to a spread-signal multiplexing circuit for frequency-multiplexing a plurality of spread signals that were generated in parallel according to the SSMA scheme. An object of the...
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7518471 |
Surface acoustic wave filter utilizing a floating electrode
A surface acoustic wave filter (cascaded dual mode SAW filter) includes three IDT electrodes disposed adjacent to each other along the propagation direction of a surface wave on a piezoelectric...
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7518470 |
Surface acoustic wave element, surface acoustic wave device and communication device including the same
A surface acoustic wave element 1 comprises a piezoelectric substrate 19 , IDT electrodes 3, 4, 5 of an odd number not less than three formed along a propagation direction of surface acoustic...
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7515017 |
Surface acoustic wave device utilizing a terminal routing pattern
A surface acoustic wave device having a surface acoustic wave filter having a comb-shaped electrode pattern formed on a piezoelectric element, electrode terminals for inputting and outputting of...
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7511587 |
Oscillator comprising two one-port surface wave resonators
The invention relates to an oscillator containing two one-port surface wave resonators as frequency-determining elements. The aim of the invention is to modify known oscillators such that the...
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7505506 |
System and method for generating single sideband, constant envelope, spread spectrum signals with multiple spreading codes
A method of generating a composite signal includes the steps of: (a) generating a plurality of sub-carriers, each sub-carrier having a different frequency position in a frequency spectrum; (b)...
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7504911 |
Surface acoustic wave resonator, surface acoustic wave device, and communications equipment
A plurality of IDT electrodes 2 to 7 each having a large number of electrode fingers extending in a direction perpendicular to a propagation direction of a surface acoustic wave propagating on...
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7504760 |
Surface acoustic wave element and method of manufacturing the same
A surface acoustic wave element having power resistance is provided. In the surface acoustic wave element, upper dispersion preventing layers and side dispersion preventing layers each made of...
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7501917 |
Surface acoustic wave filter
A SAW filter is configured by forming a first IDT and a second IDT on a piezoelectric substrate, and the first IDT is arranged between one terminal of input/output terminals and another terminal of...
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7498905 |
SAW filter and method of manufacturing the same
In an SAW filter on one side of a piezoelectric substrate are formed a pattern portion constituted by a conductor and provided on the outer circumferential portion of the surface acoustic wave...
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7498898 |
Surface acoustic wave filter, and saw duplexer
A plurality of surface acoustic wave resonators including a comb electrode and a grating reflector are coupled on a piezoelectric substrate. Dielectric film is formed on the surface of at least one...
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7489210 |
Surface acoustic wave filter and transmitter-receiver
In order to realize low impedance of input and output by introducing unbalanced balanced input/output and reduction of the number of parts, and further in order to improve the...
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7486159 |
Surface acoustic wave device
A surface acoustic wave device includes a substrate, a plurality of terminals including at least an unbalanced terminal and balanced terminals, and at least one of surface acoustic wave element...
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7482895 |
Surface acoustic wave filter
A saw filter of the invention has a piezoelectric substrate ( 11 ), plural numbers of IDT electrodes ( 12,13 ) arranged on a surface of the piezoelectric substrate ( 11 ) as well as on a first...
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7479855 |
Longitudinally-coupled-resonator-type elastic wave filter device
In a longitudinally-coupled-resonator-type elastic wave filter device, at least one of two IDTs which are adjacent to each other is provided with a dummy electrode for series weighting in a portion...
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7479854 |
Balanced-type surface acoustic wave filter
In a balanced-type surface acoustic wave filter, a first longitudinally coupled resonator surface acoustic wave filter unit connected to an unbalanced signal terminal is connected in a cascade...
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7479853 |
Balanced type surface acoustic wave filter
In a balanced type surface acoustic wave filter, a first longitudinally coupled resonator-type surface acoustic wave filter portion connected to an unbalanced input terminal and a second...
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7471171 |
Elastic boundary wave device, resonator, and filter
An elastic boundary wave device includes a LiNbO 3 substrate, an electrode exciting an elastic wave and provided on the substrate, and a silicon oxide film provided on the substrate to cover the...
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7459829 |
Surface acoustic wave device and method of manufacturing the same, IC card, and mobile electronic apparatus
A surface acoustic wave device includes a surface acoustic wave (SAW) chip and a cover that are bonded in a body by bonding a metal bonding portion of the SAW chip and a metal bonding portion of...
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7456710 |
Saw resonator
A surface acoustic wave (SAW) resonator, including: a first interdigital transducer composed of a pair of interdigital electrodes provided in a propagation direction of a surface acoustic wave; a...
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7453335 |
Surface acoustic wave resonator, surface acoustic wave filter and surface acoustic wave duplexer, and communications equipment
Disclosed is a surface acoustic wave resonator which comprises, on a piezoelectric substrate 19 , an IDT electrode 1 including bus bar electrodes 12 a , reflector electrodes 2 disposed to be...
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7453334 |
Leaky SAW resonator and method
A SAW ladder filter includes grating pads extending from opposing bus bars and interdigital transducer electrodes extending from the grating pads for defining an acoustic aperture. The metalization...
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7453333 |
Surface acoustic wave apparatus and communications equipment
A surface acoustic wave apparatus comprises a piezoelectric substrate 17 on the bottom face of which IDT electrodes 3 and 4 and an annular ground electrode 6 which encloses the IDT...
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7439827 |
Surface acoustic wave filter device
A longitudinally-coupled-resonator surface acoustic wave filter device has a sufficient pass-band width, in which a large attenuation in a stop band near the low-frequency side of a pass band and...
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7436273 |
Surface acoustic wave device and method for manufacturing the same
A SAW chip ( 11 ) where ones are balanced signal terminals and the others are unbalanced signal terminals is mounted on a mounting board ( 12 ) in a flip chip manner, and the mounting board ( 12 )...
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7429905 |
Balanced acoustic wave filter
An acoustic wave filter device includes a piezoelectric substrate and a longitudinally coupled resonator surface acoustic wave filter unit provided on the piezoelectric substrate. The surface...
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7425879 |
Surface acoustic wave filter apparatus and branching filter
In a longitudinally coupled resonator SAW filter apparatus, one end of each N first longitudinally coupled resonator SAW filter, where N is an integer equal to or greater than 2, is connected in...
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7425878 |
Surface acoustic wave filter and duplexer using the same
A multimode type SAW filter includes a piezoelectric substrate, and IDT groups formed on the piezoelectric substrate, the IDT groups each having multiple IDTs connected in series in which an...
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