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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7342788 | RF power amplifier assembly with heat pipe enhanced pallet An RF amplifier assembly employing a finned heat sink and a heat pipe enhanced aluminum pallet is disclosed. The hybrid heat pipe enhanced aluminum pallet reduces the spreading thermal conduction resistance associated with the conduction of localized energy from RF ... | 03/11/2008 |
| 7297055 | Vacuum-insulating system and method for generating a high-level vacuum A method of generating a high-level vacuum comprises evacuating a chamber having a substantially-pure gas therein to a medium-level vacuum, and freezing the residual gas to generate the high-level vacuum within the chamber. Impurities, such as atmospheric air, may b... | 11/20/2007 |
| 7286060 | Indicators for vacuum tube replacement devices A vacuum tube replacement device includes an indicator. The indicator can be arranged to provide audible and/or visual indication of system performance, function, status, or any other desired indication. The vacuum tube replacement device is pin-for-pin compatible w... | 10/23/2007 |
| 7205801 | Power down circuit capable of a wide rage control signal regardless of the power supply voltage fluction The present invention is to provide a power down circuit, which can configure a wide range of the voltage of the control signal regardless of the fluctuation of the power supply voltage. In the power down circuit 1, the drain of the first N channel MOS transi... | 04/17/2007 |
| 7199652 | Amplifier; and transmitter and communication device incorporating the same The present invention provides an amplifier for amplifying a high-frequency signal and outputting an amplified signal. The amplifier includes: an amplification element which is a bipolar transistor or a field-effect transistor; and an inductor connected between a ba... | 04/03/2007 |
| 7167761 | Methods and systems for modifying the operation of a compressor via a portable memory device A method and system for modifying the operation a device. The method can include obtaining a first reconfiguration kit. The first reconfiguration kit can include a portable memory device. The method can also include connecting the portable memory device to the devic... | 01/23/2007 |
| 7129872 | Audio signal analog-to-digital converter utilizing a transformed-based input circuit An apparatus for converting an input analog audio signal into digital form including an analog-to-digital converter. An amplifier circuit and step-down transformer provide an interface for the input analog audio signal to the analog-to-digital converter. The step-do... | 10/31/2006 |
| 6950637 | Power rate enhancement circuit for an RF power amplifier in a dual mode mobile phone There is provided a power rate enhancement circuit for a power amplifier in a dual mode mobile phone including an RF power amplifier for amplifying an RF input signal, a duplexer connected to an antenna, and an isolator connected to the duplexer. The power enhanceme... | 09/27/2005 |
| 6724250 | Transformer of power-amplifier module for an audio device A transformer of power-amplifier module for an audio device includes a casing having a first plug and a second plug formed thereon. In the casing, there is an amplifying circuit having an input electrically connected to the first plug and an output electrically conn... | 04/20/2004 |
| 6614311 | Micro-wave power amplifier A micro-wave power amplifier which amplifies a micro-wave signal including a plurality of carrier frequencies different from one another, includes (a) a field effect transistor having a grounded source, (b) a first difference frequency circuit which is el... | 09/02/2003 |
| 6518844 | Suspended transmission line with embedded amplifier A suspended transmission line with an embedded amplifier includes a support layer and a conductor supported on the support layer between first and second plates each having a ground plane. The conductor includes an input section and an output section. A p... | 02/11/2003 |
| 6396342 | Microwave amplifier generating distortion-reduced high output microwave power A microwave amplifier includes an amplifying device having a first contact region extending in a width direction, an output side impedance device spaced from the amplifying device in a transmission direction perpendicular to the width direction, the imped... | 05/28/2002 |
| 6388892 | Tuner unit A tuner unit includes a unit board. The unit board is formed, at its lower end, with a protrusion to have a terminal pattern formed on the protrusion. A frame chassis has a side plate having, at its lower end, a protrusion having a tapered side face in on... | 05/14/2002 |
| 6300827 | Method and apparatus for cascaded ground return amplifier A cascaded amplifier is integrated within an integrated circuit with a cascaded ground bus. The cascaded ground bus provides two ground points at opposite ends. Each amplifier ground of each amplifier stage couples to the ground wire there between. The ca... | 10/09/2001 |
| 6259901 | Radio-frequency power amplifier of mobile communication equipment A radio-frequency power amplifier of mobile communication equipment includes a differential amplifier arranged to balanced-input and amplify a radio-frequency signal delivered from a frequency converter of a transmission system of the mobile communication... | 07/10/2001 |
| 5726605 | Silicon carbide RF power module An RF power amplifier module utilizing a plurality of silicon carbide transistor power amplifier circuits, each including a transistor assembly having multiple cells, respectively providing power amplification of an input signal. In a preferred embodiment... | 03/10/1998 |
| 5719526 | Internal load monitor for amplifier A load monitor module for measuring voltage and current supplied from an amplifier to a load is provided within an amplifier and includes a device for calculating an impedance of the load and an amount of power delivered to the load from the amplifier. Th... | 02/17/1998 |
| 5663683 | Mist cooled distributed amplifier utilizing a connectorless module A mist cooled distributed amplifier utilizing a connectorless module. The amplifier comprises modules that are connected to waveguides in a honeycomb. The RF signals are distributed to and combined from the modules using a distributed waveguide manifold. ... | 09/02/1997 |
| 5652544 | Apparatus and method for programming an amplifier An apparatus and method for programming an amplifier includes an amplifier and a portable programmer that is removably connectable to the amplifier. The portable programmer includes a microprocessor, a keypad, and a display screen. The amplifier includes ... | 07/29/1997 |
| 5491449 | Dual-sided push-pull amplifier A Dual-Sided Push-Pull Amplifier for providing a high-gain yet low-cost amplifier capable of operating at frequencies extending above 1 GHz is disclosed. The present invention may be used in any application in which low cost amplification may be desired, ... | 02/13/1996 |
| 5352991 | Power amplifier assembly A power amplifier assembly that dissipates a maximum of one thousand one hundred watts includes a power amplifier circuit and a chassis that has an overall volume of 0.02 cubic meters. The chassis includes a heat sink base that contains a mounting pattern... | 10/04/1994 |
| 5208554 | High power compact microwave amplifier A Class A high power amplifier having an operating frequency in the range of less than substantially 2 GHz and suitable for aircraft use, is all solid state in that gallium arsenide field effect transistors are utilized. These are mounted in a large coppe... | 05/04/1993 |
| 5130891 | Docking amplifier housing assembly An amplifier housing assembly particularly useful for automobile stereo systems is disclosed. The assembly comprises a mounting plate which bolts to a stationary surface and an amplifier enclosure which mounts on the mounting plate. Wires from speakers an... | 07/14/1992 |
| 5087888 | Light weight power amplifier assembled with no hand soldering or screws A way of constructing modular RF power amplifiers. RF power amplifiers are constructed of a standardized chassis plus a number of RF power modules with each such power module containing provisions for self-cooling.... | 02/11/1992 |
| 4963833 | High powered amplifier and heat sinking apparatus An improved high powered power amplifier, where the improvement comprises an improved grounding technique by decreasing the contact resistance, and an improved thermal transfer and dissipating technique. The heat generated by a power amplifier device is t... | 10/16/1990 |
| 4901029 | Solid-state high power amplifier arrangement A power amplifier arrangement incorporating a plurality of amplifier units and a power supply unit includes a cooling arrangement that is efficient and results in compactness of the overall power amplifier arrangement. The amplifier units and power supply... | 02/13/1990 |
| 4864245 | Modification unit for an amplifier A modification unit for a musical instrument amplifier includes a modification circuit and a connector for connecting the modification circuit to a tube socket in place of one of the tubes in the pre-amp stage of the amplifier. The pre-amp includes at lea... | 09/05/1989 |
| 4751471 | Amplifying circuit particularly adapted for amplifying a biopotential input signal An amplifying circuit for amplifying a bipotential input signal, including an insulating housing having a conductive input contact mounted on the housing and adapted to engage a human body so that the bipotential input signal applied to the contact; a lea... | 06/14/1988 |
| 4565931 | Isolated amplifier circuit for amplifying pulses, in particular for a high voltage output The amplifier circuit comprises a low voltage input stage (1) connected via transformers (3) to a high voltage output stage (5). The transformers comprise a central transformer having one primary winding (30) and two oppositely-wound secondary windings (3... | 01/21/1986 |
| 4471314 | Hybrid pulse width modulated audio amplifier A high power single or multichanneled pulse width modulated (PWM) audio amplifier is fabricated in a single package using hybrid assembly techniques.... | 09/11/1984 |
| 4342002 | Modular electronic systems An amplifier system comprises a plurality of modules located within a cabinet in a manner providing minimum signal paths. The signal to be amplified is divided into frequency ranges for main amplification, and each main amplifier has an independent power ... | 07/27/1982 |
| 4223272 | Four-terminal network of adjustable transfer function A four-terminal network selectively convertible into a low-pass, high-pass, band-pass, all-pass or band-stop filter comprises three cascaded stages each including an operational amplifier with a grounded noninverting input, the amplifiers of the first two... | 09/16/1980 |
| 4214214 | Connecting cable A connecting cable comprising a length of coaxial cable having at one of its ends an input plug connector whose first and second input terminals are adapted to connect to the electrical output terminals of a pickup of a musical instrument, and means compr... | 07/22/1980 |
| 4151479 | Low frequency power amplifier using MOS FET's A low frequency power amplifier uses MOS FET's each having a semiconductor device unit including a source electrode, a drain electrode and an insulated gate electrode filled in a can type casing with the source electrode being electrically connected to th... | 04/24/1979 |
| 4134077 | Amplifier circuit operable over a wide temperature range An amplifier circuit having stable performance characteristics over a wide temperature range from approximately 0° C up to as high as approximately 500° C, such as might be encountered in a geothermal borehole. The amplifier utilizes ceramic vacuum tube... | 01/09/1979 |
| 4124877 | Amplifier with digital control In electronic amplifiers it is desirable to have the capability of accurate setting of the characteristic values while still having a limited space on a front panel. In order to accomplish this, a digital switch having a plurality of digital switch units ... | 11/07/1978 |
| 4059810 | Resin-encased microelectronic module A metal plate carrying a semiconductive chip with a five-terminal power amplifier is encased in a prismatic resinous body having five tongues projecting from one side thereof, the central tongue being grounded to the plate while the other four are attache... | 11/22/1977 |
| 4055809 | Amplifying device Various types of repeaters which are requisite in combination for making electrical networks such as CATV or MATV systems are unified into a common or universal repeater enabling three fundamental performances comprising a trunk line junction, a branching... | 10/25/1977 |
| 3940666 | Circuit module with recess for receiving a coupling coil A circuit module, such as is used in a modular L-C filter, includes a support having a base portion and side portions. One or more electric circuit elements, such as inductors and capacitors, are mounted on the support. One of the side portions of the sup... | 02/24/1976 |
