Matches 1 - 50 out of 264 1 2 3 4 5 6 >


Match Document Document Title
7411445 Phonon laser  
A phonon laser pumped by a thermal gradient, the phonon laser having a coherent phonon pumping media, a heat source and a heat sink. The pumping media includes an array of micro resonators and a...
7349678 Circuit arrangement for transmitting and receiving radio signals simultaneously  
A circuit arrangement for transmitting and receiving radio signals includes an amplification device with an output for transmitting signals, an input for receiving signals and a supply line, and...
6194774 Inductor including bonding wires  
An inductor includes a semiconductor substrate, pairs of pads formed on the semiconductor substrate at predetermined intervals with the pads in a pair spaced apart a predetermined distance,...
6028486 Method and apparatus for reducing power dissipation in multi-carrier amplifiers  
A method and apparatus are provided for reducing power dissipated by an amplifier circuit such as a line driver in a Digital Subscriber Line (DSL), a power amplifier in a radio environment, etc....
6028484 Ultrasound apparatus and method for amplifying transmit signals  
A method and system for amplifying an ultrasonic transmit signal is provided. A first amplifier stage has a first supply voltage input and receives transmit signals. A second amplifier stage has a...
5714917 Device incorporating a tunable thin film bulk acoustic resonator for performing amplitude and phase modulation  
A method for amplitude modulating signals, and a circuit that operates in accordance with the method. The method includes a first step of applying a modulating low frequency signal having a...
5001483 Digital to analog converter for an acoustic charge transport device  
A digital-to-analog converter for an acoustic charge transport (ACT) device that permits an ACT device to directly accept digital inputs. The digital-to-analog converter includes a plurality of...
4928069 Amplifying surface wave receiver  
An amplifying surface wave receiver for a surface wave element composed of a material which exhibits the piezo effect and which can be rendered electrically conductive by local doping, where a...
4847565 Solid state electromagnetic wave amplifier  
A solid state electromagnetic wave amplifier is provided with confinement structures for the prevention of transverse carrier wave diffusion into the amplifier body. The carrier waves are confined...
4839607 Frequency-doubling amplifying surface wave receiver  
An amplifying surface wave receiver for a surface wave element composed of a material which has the piezo effect and which can be rendered electrically conductive by local doping wherein a doped...
4739383 Optical detector and amplifier based on tandem semiconductor devices  
If a semiconductor device is prepared so that it contains a photoconductive region in electrical series with a photovoltaic region, (i.e., a Schottky barrier or p-n junction) it can function as an...
4636678 Compensation of acoustic wave devices  
Compensation for the effects of environmentally caused changes and aging on piezoelectric acoustic wave devices is electrically provided by the application of a signal, such as a DC bias voltage,...
4543533 Parametric amplifier  
The parametric amplifier includes plurality of parameter changing or exciting regions provided in a periodic array on a wave propagation medium having the property that waves having different...
4471255 Surface acoustic wave parametric device  
An surface acoustic wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which...
4426732 Receiver having a surface elastic wave high frequency amplifier with a frequency-controlled pump oscillator  
Receiver comprising at least two output means taking out electric signals corresponding to sound waves propagating in different directions in a surface elastic wave amplifier disposed in the high...
4410833 Solid state magnetron  
A magnetron in which the space between the anode and cathode contains a h mobility semiconductor. The structure is non-cylindrically symmetric because the anode and cathode are placed on top of...
4333344 System and method for testing the reaction of rare earth ions  
A crystalline bar is doped with a rare earth. The bar is transparent to ration, such as from a laser, at a light wavelength which excites the rare earth ions in the bar and the light is modulated...
4288765 Frequency selector apparatus  
A frequency selector apparatus which effects a frequency selection by providing at least one reflecting electrode at a position adjacent elastic surface wave transducer or transducers provided in...
4233530 Elastic surface wave device  
An elastic surface wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which...
4197483 Submillimeter wave generation using surface acoustic waves in piezoelectric materials  
A generator for variable frequency submillimeter waves launches surface astic waves in piezoelectric material for generation of an associated acousto-electrical field. An electron beam is acted...
4152658 Resistive film stabilization of coplanar AMP device  
Undesirable odd mode oscillations in coplanar active medium propagation (AMP) devices are suppressed, and transmission of the desired even mode signal is enhanced by placing a planar resistance...
4151476 Magnetic bubble traveling wave amplifier  
A device is disclosed for amplifying electromagnetic waves propagating al a meander line slow wave structure by means of magnetic cylindrical domains or bubbles which are propagating at...
4132956 Circuit arrangement for amplifying high frequency electromagnetic waves  
A circuit for amplifying high frequency electromagnetic waves composed of a Josephson junction constituting an electromagnetic high frequency line along which electromagnetic waves can propagate...
4099132 Negative differential mobility amplifier for a progressive wave  
A negative differential mobility amplifier with a layer of semiconductor material of negative differential mobility. Two electrodes formed by two metallic combs are disposed on the free surface of...
4090155 Transmission line for electromagnetic wave  
A transmission line is disclosed which comprises a conductive layer, a resistive semiconductor layer disposed on the conductive layer and a blocking electrode disposed on the resistive...
4088969 Tapped surface acoustic wave delay line  
A tapped surface acoustic wave (SAW) delay line with time-resolved outputs sing piezoelectric leaky wave coupling and bulk wave amplification, and having low loss characteristics. A solid...
4085377 Microwave frequency discriminator comprising a one port active device  
A microwave frequency discriminator using a one port active device amplifier including a circulator for coupling an input RF signal of substantially constant power level into the amplifier and an...
4055816 Voltage stress stabilized saw device  
An oscillator or similar device employing a frequency setting SAW element having a piezoelectric substrate and an arrangement of interdigital finger transducers mounted thereon. In one embodiment,...
4054851 Acoustic surface-wave filter  
An acoustic surface-wave filter comprises an element which is excitable to perform surface oscillations, which is formed at least partly of piezoelectric material and has interference locations...
4050027 Optical signal amplifier  
Amplification of optical signals propagating through a first waveguide is achieved by modulation of high intensity light propagating through an elastomeric waveguide responsive to said signals,...
4025876 Distributed feedback acoustic surface wave oscillator  
An acoustic surface wave oscillator is constructed from a semiconductor-piezoelectric acoustic surface wave amplifier by providing appropriate perturbations at the piezoelectric boundary. The...
4017751 Elastic volume wave convolution device  
The invention relates to a device which forms the product of convolution of two signals available in electrical form. This device consists of a substrate of lead molybdate in which there are...
4016513 Surface wave convolver apparatus  
Apparatus for convolving acoustic surface waves without dispersion comprising a piezoelectric substrate having surface acoustic waves generated at opposite ends thereof and directed towards an...
3996529 Varactor tuning apparatus for a strip transmission line device  
A varactor tuning apparatus for tuning a strip transmission line radio frequency device, wherein the device having predetermined operating characteristics includes an active element such as an...
3990021 Surface wave multifrequency oscillator  
A variable frequency VHF or UHF band oscillator is disclosed. Principal control over the precise location and stability of the frequency of oscillation is provided by a surface wave delay line in...
3979697 Frequency modulated saw oscillator  
An oscillator in which the "tank circuit" or feedback element is a surface acoustic wave (SAW) bandpass filter (delay line). A modulating voltage is applied from end-to-end of the piezoelectric...
3975690 Planar transmission line comprising a material having negative differential conductivity  
A planar transmission line comprising a Gunn effect semiconductor having an epitaxial portion as the propagating medium amplifies and switches r.f. signals and is not transit time limited in the...
3974459 Millimeter waveguide oscillator and amplifier structure  
Disclosed is a millimeter wave waveguide structure adapted for operation with negative resistance devices, such as solid state avalanche breakdown diodes, at frequencies up to about 170 GHz or...
3953878 Constant temperature control for transferred electron devices  
Two transferred electron devices are provided in a thermally coupled relationship. One transferred electron device is operated above threshold voltage as an amplifier or oscillator, while the...
3946336 Microwave solid state circuit employing a bipolar transistor structure  
This microwave circuit incorporates a transistor structure that provides either a two port amplifier or an injection frequency locked oscillator. This circuit eliminates circulators employed with...
3909741 Acoustic transducer with direct current output  
An acoustic transducer which produces a direct current output signal suitable for capacitive storage is described. Incident acoustic energy is converted to a surface wave in a piezoelectric rod. A...
3906385 Gunn effect power divider  
A Gunn effect triode is utilized to provide a power divider. The power divider may, for example, be provided with a main branch from which depend two or more legs and from each of which a replica...
3886484 Acoustic surface wave devices having improved performance versus temperature characteristics  
More than one piezoelectric substrate or a single multifaceted piezoelectric substrate, each facet or substrate having interdigital transducers deposited thereon and coupled in cascade, comprise...
3882408 Parametric acoustic surface wave amplifier  
A parametric acoustic surface wave amplifier which includes a pair of transducers located on an acoustic surface wave propagating medium at predetermined positions and coupled to phase-related...
3882420 Magnetically tunable ferrite stripline trapatt mode oscillator and amplifier circuits  
An active element for generating signals in a Trapatt mode at a desired frequency is included in a transmission line circuit on a ferrite substrate. The transmission line circuit has a first...
3879673 CIRCULATING ACOUSTIC SURFACE WAVE  
A circulating acoustic surface wave device including an elastic acoustic wave propagating medium formed so that the acoustic surface waves established by a suitably positioned transducer can...
3873858 Acoustic surface wave phase shifter  
An acoustic surface wave phase shifter including a piezoelectric medium for propagating a surface wave and a conducting device disposed proximate a surface of the piezoelectric medium on which a...
3871017 High-frequency phonon generating apparatus and method  
Apparatus for generating high frequency phonons wherein a multi-valley semiconductor device is pumped and a shear stress or uniaxial stress exerted upon the device to produce different-valued...
3863167 PARAMETRIC MOVING FIELD AMPLIFIER  
A parametric moving field amplifier comprises an amplifier with a metal insulator semiconductor structure.
3862431 SIGNAL PROCESSING APPARATUS  
Signal processing apparatus wherein acoustic waves are generated and propagated through a piezoelectric semiconductor so as to parametrically interact adjacent to an output electrode so as to...

Matches 1 - 50 out of 264 1 2 3 4 5 6 >