Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8049564 | Distributed active transformer amplifier with differential power combiner A power amplifier formed by a plurality of pairs of transistors, each pair including a first transistor and a second transistor having each a respective input terminal and a respective output terminal. The output terminals of the first and second transistors of each... | 11/01/2011 |
| 8049563 | Distributed circular geometry power amplifier architecture The present invention discloses a distributed power amplifier topology and device that efficiently and economically enhances the power output of an RF signal to be amplified. The power amplifier comprises a plurality of push-pull amplifiers interconnected in a novel... | 11/01/2011 |
| 8031003 | Solid-state RF power amplifier for radio transmitters An RF power amplifier includes a push-pull amplifier having field effect transistors. Temperature compensating bias circuitry provides a temperature compensated bias voltage to the transistors for decreasing the bias voltage thereof as temperature increases. The tem... | 10/04/2011 |
| 8018283 | Reconfigurable distributed active transformers Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dy... | 09/13/2011 |
| 7990220 | RF power amplifier A reduction is achieved in the primary-side input impedance of a transformer (voltage transformer) as an output matching circuit without involving a reduction in Q-factor. An RF power amplifier includes transistors, and a transformer as the output matching circuit. ... | 08/02/2011 |
| 7777570 | Transformer power combiner having secondary winding conductors magnetically coupled to primary winding conductors and configured in topology including series connection and parallel connection A transformer power combiner having a plurality of input ports and an output port is provided. The transformer power combiner includes a plurality of primary winding conductors and a plurality of secondary winding conductors. The primary winding conductors are elect... | 08/17/2010 |
| 7733183 | Reconfigurable distributed active transformers Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dy... | 06/08/2010 |
| 7683718 | Solid-state RF power amplifier for radio transmitters An RF power amplifier includes first and second field effect transistors having a gate, a source, and a drain, having an output power rating of at least 200 watts, and operating with a drain-to-source voltage that is greater than 50 VDC. The transistors are configur... | 03/23/2010 |
| 7504883 | Amplifier device including an operational amplifier, transformer and feedback loop An amplifier device including at least one operational amplifier, whereby a transformer is connected upstream from the input of the operational amplifier and the output signal of the operational amplifier or a signal generated from this output signal is fed back aga... | 03/17/2009 |
| 7486141 | Wide bandwidth, high power amplifier A wide bandwidth, high power amplifier system for amplifying a signal in a radio frequency (RF) system in a specific bandwidth within the frequency range from 1 MHz to 100 GHz. The system includes a number of amplifier modules and an equal number of input transforme... | 02/03/2009 |
| 7432793 | Amplifier output filter having planar inductor An output filter for an audio amplifier includes a printed circuit board having at least one aperture extending through the printed circuit board. The output filter includes a first coil winding formed on a layer of the printed circuit board. The first coil winding ... | 10/07/2008 |
| 7425869 | Distributed circular geometry power amplifier architecture The present invention discloses a distributed power amplifier topology and device that efficiently and economically enhances the power output of an RF signal to be amplified. The power amplifier comprises a plurality of push-pull amplifiers interconnected in a novel... | 09/16/2008 |
| 7372336 | Small-sized on-chip CMOS power amplifier having improved efficiency A small-sized on-chip complementary metal-oxide semiconductor (CMOS) Power Amplifier having improved efficiency is provided herein. The on-chip CMOS power amplifier is capable of improving efficiency and maximizing output thereof by enhancing a K factor, which may c... | 05/13/2008 |
| 7362182 | Power amplifier A radio frequency power amplifier including control electronics for providing control signals for timing of the power amplifier. A first group of the drivers are coupled to the control electronics and a second group of drivers are coupled to the control electronics.... | 04/22/2008 |
| 7358815 | Monolithic transformer based amplifier for integrated circuits Monolithic transformer based amplifier for integrated circuits. The amplifier includes an input transformer with a first impedance transforming ratio. The input transformer includes a coupled line structure. An amplification circuit is coupled to the input transform... | 04/15/2008 |
| 7339453 | Differential mode inductor with a center tap A differential mode inductor includes a first inductor lead that receives a current. A first arm receives the current from the first inductor lead. A center tap receives the current from the first arm. A second arm receives the current from the center tap. The secon... | 03/04/2008 |
| 7336127 | Doherty amplifier configuration for a collector controlled power amplifier An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty... | 02/26/2008 |
| 7330076 | Reconfigurable distributed active transformers Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dy... | 02/12/2008 |
| 7330071 | High efficiency radio frequency power amplifier having an extended dynamic range A system and method are provided for efficiently amplifying a radio frequency signal. In general, the system includes power amplifier circuitry that efficiently amplifies an input signal under power back-off conditions. In one embodiment, the power amplifier circuit... | 02/12/2008 |
| 7321752 | Linear amplification arrangement with non-linear amplifier element for a mobile radio device A system and method to optimize the efficiency of an amplifier device is provided by the including a non-linear amplifier in a mobile radio device. A phase displaced signal in relation to the input signal is respectively produced in the amplifier device with a non-l... | 01/22/2008 |
| 7319435 | Balun for an antenna A balun used in high-power applications capable of accommodating a transmission line includes a core with a top surface and a bottom surface formed from soft iron material. At least two holes are provided through the core between the top surface and the bottom surfa... | 01/15/2008 |
| 7301400 | Multi-phase switching power supply for mobile telephone applications A mobile terminal including a multi-phase DC-DC converter for controlling a supply voltage provided to a power amplifier in the transmit chain. In general, the multi-phase DC-DC converter includes a multi-phase converter control system and a multi-phase power train.... | 11/27/2007 |
| 7289775 | Method for transmit power control A transceiver has power control circuitry integrated therein. In particular, the power control circuitry receives a signal indicative of the transmit power level and adjusts the gain on a variable gain amplifier within the transceiver such that the output of the tra... | 10/30/2007 |
| 7286016 | Amplifier bias circuit, method for biasing an amplifier and integrated circuit comprising an amplifier bias circuit An amplifier bias circuit connectable to an amplifier device, comprising a first sensor device for sensing a first amplifier characteristic and for providing at a first sensor output a bias signal related to the first amplifier characteristic. The circuit further co... | 10/23/2007 |
| 7260377 | Variable-gain low noise amplifier for digital terrestrial applications A multi-stage amplifier assembly configured to receive a terrestrial digital television (“DTV”) input signal including multiple frequency channels. The amplifier assembly optionally includes a PIN diode coupled across differential inputs to a first stage of the ... | 08/21/2007 |
| 7256573 | Distributed active transformer power control techiques A distributed active transformer on a semiconducting substrate is provided. The distributed active transformer includes an outer primary, a secondary disposed adjacent to the outer primary, and an inner primary disposed adjacent to the outer primary and the secondar... | 08/14/2007 |
| 7251292 | Technique and apparatus for low power wireless communication A system includes first unit, a processor and a transmitter. The processor is located in the first unit to generate data to be communicated to a second unit that is physically separated from the first unit. The transmitter includes an antenna, a first circuit and a ... | 07/31/2007 |
| 7248120 | Stacked transistor method and apparatus A method and apparatus is described for controlling conduction between two nodes of an integrated circuit via a stack of FETs of common polarity, coupled in series. In an RF Power Amplifier (PA) having appropriate output filtering, or in a quad mixer, stacks of two ... | 07/24/2007 |
| 7230488 | Amplifying circuit, noise reducing apparatus and power converting apparatus An amplifying circuit, which generates a compensation current based on a detection result of a leakage current flowing between an AC power source for supplying power and a power converting circuit section, includes a main amplifier having transistors and a correctio... | 06/12/2007 |
| 7224944 | RF transceiver having a directly radiating transistor Transistor package leads form quarter-wave antenna elements that directly radiate RF energy into free space without the need for a separate antenna. The transistor operates at a fundamental frequency and radiates a harmonic, thereby allowing radiation at frequencies... | 05/29/2007 |
| 7193459 | Power amplifier control technique for enhanced efficiency A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier s... | 03/20/2007 |
| 7187197 | Transmission line driver A transmission line driver with slew rate control includes high and low side ramp generators for generating charge and discharge ramp signals, respectively, which are input to respective comparators and a pair of source follower transistors. A pair of additional tra... | 03/06/2007 |
| 7184735 | Radio frequency integrated circuit having symmetrical differential layout A radio frequency circuit includes a first differential RF path and a second differential path. The first differential RF path includes at least one RF block that includes a first differential section and a second differential section, wherein the first differential... | 02/27/2007 |
| 7176774 | Differential mode inductor with a center tap A differential mode inductor includes a first inductor lead that receives a current. A first arm receives the current from the first inductor lead. A center tap receives the current from the first arm. A second arm receives the current from the center tap. The secon... | 02/13/2007 |
| 7173488 | Vacuum tube power amplifier switchable between push-pull and single ended configurations A vacuum tube power amplifier with a user-operable switch and a single output transformer which selectively provides push-pull or single ended configurations for driving a loudspeaker. ... | 02/06/2007 |
| 7167054 | Reconfigurable power control for a mobile terminal Power control circuitry that is configurable as either a Low Dropout (LDO) voltage regulator or a switching DC—DC converter for controlling a variable supply voltage provided to a power amplifier of a mobile terminal is provided. The power control circuitry includ... | 01/23/2007 |
| 7154954 | Communication system A communication system in which a reception signal can be accurately obtained from a signal transmitted over two-wire type transmission lines without any significant reduction in the communication speed. The communication system utilizing two-wire type transmission ... | 12/26/2006 |
| 7132891 | Power amplifier control using a switching power supply A system is provided for adjusting an output power of a multi-stage power amplifier by controlling a supply voltage provided to one or more output amplifier stages of the power amplifier using a switching DC—DC converter. In general, the system includes a power am... | 11/07/2006 |
| 7119619 | Reconfigurable distributed active transformers Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dy... | 10/10/2006 |
| 7109791 | Tailored collector voltage to minimize variation in AM to PM distortion in a power amplifier A system is provided for substantially reducing variation in AM to PM distortion of a power amplifier caused by variations in RF drive power and temperature. The system includes power control circuitry and power amplifier circuitry. The power amplifier circuitry inc... | 09/19/2006 |
