Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Application No. | Application Title | Issue Date |
| 20120105153 | POP SOUND REDUCTION CIRCUIT AND AUDIO CIRCUIT HAVING SUCH POP SOUND REDUCTION CIRCUIT FOR USE IN AUDIO AMPLIFIER A disclosed pop sound reduction circuit reducing generation of pop sound at activation or deactivation of an audio amplifier includes a reference voltage circuit generating a reference voltage, a differential amplifier circuit having first and second inputs to amplify t... | 05/03/2012 |
| 20120106600 | ANALOG SIGNAL PROCESSOR FOR NONLINEAR PREDISTORTION OF RADIO-FREQUENCY SIGNALS RF predistortion apparatus for making linear the output signal of non-linear components such as RF power amplifiers. The apparatus comprises an RF input line for carrying an RF signal connected to an envelop detector for finding the envelop of the RF signal, a power det... | 05/03/2012 |
| 20120081178 | POWER AMPLIFICATION DEVICE AND METHOD FOR ACQUIRING POWER ADJUSTING COEFFICIENT An embodiment of the invention discloses a power amplification device and method and a method for acquiring a power adjusting coefficient. The power amplification device according to one embodiment of the invention includes: a power control module configured to perform ... | 04/05/2012 |
| 20120068768 | TRANSMISSION APPARATUS AND DISTORTION COMPENSATION METHOD A transmission apparatus includes an analog digital converter that performs sampling on a demodulated signal obtained by demodulating a part of an output signal, which is produced by amplifying a modulated signal of a baseband signal including a plurality of signals hav... | 03/22/2012 |
| 20120032739 | DIGITAL PREDISTORTION CIRCUIT WITH EXTENDED OPERATING RANGE AND A METHOD THEREOF A digital predistortion circuit and method with extended operating range includes a predistortion function, a D/A converter, a multiplier for performing frequency translation and a power amplifier. The digital predistortion circuit includes a multiplier for receiving a ... | 02/09/2012 |
| 20120025909 | DISTORTION COMPENSATION APPARATUS AND APPARATUS AND METHOD FOR TRANSMITTING SIGNAL A distortion compensation apparatus and an apparatus and method for transmitting a signal are provided. The distortion compensation apparatus can extract precise distortion information by adding an additional signal to an input signal during the compensation of distorti... | 02/02/2012 |
| 20120019320 | Signal alignment for envelope tracking system There is disclosed a method for determining the timing misalignment between a power supply and an output in an envelope tracking amplification stage, the method including the steps of: estimating a distortion parameter in the amplification stage; and determining a timin... | 01/26/2012 |
| 20120007672 | Linearization Device for a Power Amplifier A linearization device for a power amplifier using adaptive digital baseband predistortion includes a pre-inverse block receiving a complex discretized input signal {tilde over (x)}e(n) and restoring a complex predistorted signal {tilde over (x)}p(... | 01/12/2012 |
| 20110304392 | AMPLITUDE-STABILIZED ODD ORDER PRE-DISTORTION CIRCUIT An amplitude-stabilized third-order predistortion circuit includes a main cell having a differential input for receiving a differential input voltage, a differential output for providing a differential output voltage, and a load control input for receiving a load contro... | 12/15/2011 |
| 20110304390 | COMPENSATION DEVICE APPLIED TO POWER AMPLIFIER, METHOD FOR DETERMINING PRE-DISTORTION OF POWER AMPLIFIER, AND METHOD FOR COMPENSATING LINEARITY OF POWER AMPLIFIER THEREOF A method for determining pre-distortion of a power amplifier includes the following steps: providing a first power input signal to make the power amplifier generate a first power output signal; receiving a first receiving signal, which is acquired according to the first... | 12/15/2011 |
| 20110267143 | SYSTEM FOR REDUCING NOISE IN A CATV HOME AMPLIFIER UPSTREAM PATH AND A METHOD THEREOF A system for control of noise in a cable TV upstream path of a bi-directional cable TV home amplifier system that is positioned in the premises of the end user includes a noise control circuit and a coupler element that couples between the noise control circuit and the ... | 11/03/2011 |
| 20110260792 | DISTORTION COMPENSATION DEVICE, RADIO COMMUNICATION DEVICE, AND DISTORTION COMPENSATION METHOD A distortion compensation device includes a distortion compensation unit which compensates for a distortion generated in a power amplifier by using a polynomial in which a signal to be input into a power amplifier is raised to a power of a degree N (N is an integer larg... | 10/27/2011 |
| 20110254623 | DISTORTION COMPENSATION CIRCUIT Disclosed is a distortion compensation circuit that efficiently compensates for distortion. A distortion compensation circuit (20) comprises a sampling memory unit (21), which accumulates an input signal and an output signal from an amplifier (4), a... | 10/20/2011 |
| 20110254624 | DISTORTION COMPENSATING CIRCUIT AND RADIO BASE STATION A distortion compensation circuit capable of realizing highly accurate distortion compensation by updating a model even under a situation in which the appearance frequency of an input signal having a maximum value is low. A DPD processor 2 includes an inverse mod... | 10/20/2011 |
| 20110255636 | DISTORTION COMPENSATION CIRCUIT, TRANSMITTING APPARATUS AND DISTORTION COMPENSATING METHOD A distortion compensation circuit for compensating for the distortion characteristics of an amplifier, includes a distortion compensating coefficient calculating element and a distortion compensating operation element. The distortion compensating coefficient calculating... | 10/20/2011 |
| 20110234314 | Adaptive compensation systems for mitigating distortion due to nonlinear power amplifiers A method for pre-processing a signal prior to receipt of the signal by a non-linear device (NLD) to compensate for AM-AM distortion and AM-PM distortion of the signal by the NLD. The method includes generating a modified amplitude rk based on an amplitude x 09/29/2011 | |
| 20110234315 | Power Amplifier Linearization Using Cancellation-Based Feed Forward Methods and Systems Linearizers can improve the linearity of power amplifiers by canceling or reducing amplitude of non-linearity components, (e.g., IM3, IM5, IM7, IM9, etc.) generated by the power amplifier. The linearizers can obtain samples of signals output ... | 09/29/2011 |
| 20110227643 | DISTORTION COMPENSATING APPARATUS, AMPLIFYING APPARATUS, TRANSMITTING APPARATUS, AND DISTORTION COMPENSATING METHOD A distortion compensating apparatus that compensates signal distortion caused by an amplifier includes a distortion compensating process unit that using a distortion compensation coefficient, compensates distortion of an input signal; a memory unit storing therein the d... | 09/22/2011 |
| 20110227644 | DISTORTION COMPENSATING APPARATUS, AMPLIFYING APPARATUS, TRANSMITTING APPARATUS, AND DISTORTION COMPENSATING METHOD A distortion compensating apparatus that compensates signal distortion caused by an amplifier includes a distortion compensating process unit that using a distortion compensation coefficient, compensates distortion of an input signal; a memory unit that stores the disto... | 09/22/2011 |
| 20110221524 | RADIO APPARATUS, DISTORTION CORRECTION DEVICE, AND DISTORTION CORRECTION METHOD When a distortion correction coefficient, which is calculated according to a signal input to a power amplifier and a signal output from the power amplifier, is larger than a first threshold, a distortion correction coefficient corresponding to the input signal is update... | 09/15/2011 |
| 20110221526 | METHOD AND APPARATUS FOR A GAIN CONTROL CIRCUIT VIA A HIGH FREQUENCY SIGNAL A gain control amplifier provides amplitude variation of an input signal that is coupled to the amplifier, by adding or combining a higher frequency signal that overdrives or distorts the amplifier to one or more degree(s), to provide the gain variation of the input sig... | 09/15/2011 |
| 20110221527 | DIGITAL PREDISTORTION APPARATUS AND METHOD FOR IMPROVING PERFORMANCE USING PEAK LEVEL EXPANSION A method an apparatus improve linearization performance and reduce a convergence time of a Digital Pre-Distorter of a power amplifier. An input signal is received. A peak level of the input signal is expanded based on an expansion threshold. And the expanded peak level ... | 09/15/2011 |
| 20110221525 | RADIO APPARATUS, DISTORTION CORRECTION DEVICE, AND DISTORTION CORRECTION METHOD An error between the power of an input signal, which is input to a power amplifier, and the power of an output signal, which is output from the power amplifier, is calculated. The calculated error is normalized according to the power of the input signal or the power of ... | 09/15/2011 |
| 20110210789 | POWER SERIES DIGITAL PREDISTORTER AND DISTORTION COMPENSATION CONTROL METHOD THEREOF Coefficients W0, W1 and W2 to be used in finding a new quadratic function f2(W) indicating dependence of a distortion component on an coefficient by the least square method are obtained as values that satisfy a relational expr... | 09/01/2011 |
| 20110210788 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE AND TRANSMISSION AND RECEPTION SYSTEM A semiconductor integrated circuit device comprising a linearizer that has a plurality of switchable first gain characteristics, the linearizer switching to the first gain characteristic to generate an intermediate signal from an input signal by using the switched first... | 09/01/2011 |
| 20110204975 | CALCULATING APPARATUS, DISTORTION CORRECTING APPARATUS, AMPLIFYING APPARATUS, AND CALCULATING METHOD A calculating apparatus includes a first state variable calculating unit that calculates first state variables respectively having a memory effect and being of an amplifier that causes signal distortion; an amplifier model unit that based on the calculated first state v... | 08/25/2011 |
| 20110193635 | WIDE BAND LNA WITH NOISE CANCELING Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first and a second amplifier which work together to noise cancel the noise generated at an input stage circuit. The input stage circuit receives an RF signal and is char... | 08/11/2011 |
| 20110187455 | Adaptive Digital Predistortion Device and Method The present invention relates to an adaptive digital predistortion device and method. The adaptive digital predistortion device comprising: a predistortion unit for predistorting an input signal according to a predistortion parameter stored in a look-up table; a cost fu... | 08/04/2011 |
| 20110187453 | Linearizer incorporating a phase shifter The present invention pertains to a pre-distorter linearizer that incorporates a balanced-to-unbalanced transmission line transition as a phase shifter to feed the linear and non-linear arms of the linearizer with signals of substantially the same amplitude and with a f... | 08/04/2011 |
| 20110187454 | DISTORTION COMPENSATING APPARATUS, TRANSMITTING APPARATUS, AND DISTORTION COMPENSATING METHOD An apparatus includes: a unit that stores the look-up table including distortion compensation coefficients; a unit that selects addresses according to an input signal, acquires coefficients stored at the selected addresses, and performs the predistortion of the input si... | 08/04/2011 |
| 20110181355 | SIGNAL-COMPENSATION DEVICE AND COMMUNICATION APPARATUS A signal-compensation device includes a band-limitation unit that performs band limitation on a signal based on a variably adjusted band-set value and externally transmits the signal subjected to the band limitation to an amplifier, a measurement unit that measures a si... | 07/28/2011 |
| 20110175678 | Amplifier Linearizer The present invention provides an advanced adaptive predistortion linearization technique to dramatically reduce nonlinear distortion in power amplifiers over a very wide instantaneous bandwidth (up to 2 GHz) and over a wide range of amplifier types, input frequencies, ... | 07/21/2011 |
| 20110169566 | PREDISTORITION LINEARIZER WITH BRIDGE TOPOLOGY HAVING AN EQUALIZER STAGE FOR EACH BRIDGE ARM Disclosed is a predistortion linearizer for power amplifiers using a bridge topology, which has the advantages that an equalizer stage is disposed in each of the linear and nonlinear branches. This equalizer stage is used to adjust the frequency response of the complex ... | 07/14/2011 |
| 20110163806 | DISTORTION COMPENSATION AMPLIFICATION DEVICE It is intended to increase the efficiency of a distortion compensation amplification device having a pre-distorter 1. Level detecting means 11 detects a signal level, correspondence storage means 12 outputs a distortion compensation coefficient depe... | 07/07/2011 |
| 20110163805 | Time - Alignment of Two Signals Used for Digital Pre-Distortion A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well suite... | 07/07/2011 |
| 20110156815 | MODULATION AGNOSTIC DIGITAL HYBRID MODE POWER AMPLIFIER SYSTEM AND METHOD A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domai... | 06/30/2011 |
| 20110156814 | METHOD AND APPARATUS FOR A POWER SUPPLY MODULATOR LINEARIZER A method and apparatus for a power amplifier module is described. The module includes a power amplifier and a power supply modulator coupled to the power amplifier. In addition, the module includes an inverter coupled between the power amplifier and the power supply mod... | 06/30/2011 |
| 20110148520 | SYSTEM AND A METHOD FOR SIGNAL PROCESSING A system for processing an input signal, the system includes: a hardware memory module configured to store a lookup table; and a signal processing module, configured to process the input signal to provide a second signal, and to transmit the second signal to a power amp... | 06/23/2011 |
| 20110140780 | APARATUS AND A METHOD FOR PROCESSING AND AMPLIFYING A SIGNAL A method and an apparatus. The apparatus includes at least one sensor for sensing at least one parameter that affects a non-linearity of the non-linear amplifier and for generating at least one parameter indicator; a memory module for storing multiple sets of pre-distor... | 06/16/2011 |
| 20110140779 | APPARATUS AND METHOD FOR PRE-DISTORTING AND AMPLIFYING A SIGNAL A method and an apparatus. The apparatus includes: a non-linear amplifier for generating an amplified signal, wherein a non-linearity of the non-linear amplifier, unless compensated by a provision of a pre-distorted signal, broadens a spectrum of the amplified signal fr... | 06/16/2011 |
