Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 8188790 | Gated class H amplifier/line driver system and method Amplifier circuitry (10) includes a driver amplifier (11) and an integrator amplifier (AH) producing an output signal (VAH) that controls a pass transistor (Q2) coupled to a pump capacitor (CH). Input circuitry (... | 05/29/2012 |
| 8174313 | Apparatus and method for controlling power amplifier An apparatus for controlling a power amplifier configured to amplify radio frequency (RF) signal includes a detector and a controller. The detector is configured to detect a power level of the RF signal with respect to a predetermined power threshold and to generate... | 05/08/2012 |
| 8159294 | Multi-voltage headphone drive circuit The present invention discloses a multi-voltage headphone driver circuit comprising: at least one operational amplifier having an output supplied to a headphone speaker, the operational amplifier receiving a first power supply as its high operation voltage; a charge... | 04/17/2012 |
| 8098093 | Efficient envelope tracking power supply for radio frequency or other power amplifiers An apparatus includes an envelope tracking power supply configured to control a power amplifier. The power supply includes a first amplifier configured to receive an input voltage and generate a supply voltage for the power amplifier. The power supply also includes ... | 01/17/2012 |
| 8030995 | Power circuit used for an amplifier A power circuit used for an amplifier, which includes an amplifier provided with a linear amplifier serving as a voltage source, a DC/DC converter serving as a current source, a hysteresis comparator controlling the DC/DC converter, and a current detector detecting ... | 10/04/2011 |
| 7969240 | Gain control for linear radio frequency power amplifiers A bias control circuit is provided comprising an input port for receiving a signal indicative of an amplitude of a supply voltage provided to a multi stage power amplifier circuit. Electronic circuitry, electrically coupled to the input port, generates a bias contro... | 06/28/2011 |
| 7944294 | Signal amplification An apparatus for amplifying a signal. The apparatus includes an amplifier powered by a power supply, a monitor that monitors an output signal of the amplifier and a controller operative to adjust the power supply if distortion is detected in the output signal of the... | 05/17/2011 |
| 7880542 | Incremental gain amplifier An amplifier includes an amplifier section having selectable signal paths to provide discrete gain settings, and logic to incrementally select the signal paths. The logic may be configured to increment the gain in response to digital gain control signals or an analo... | 02/01/2011 |
| 7872527 | Power supply control system and method with variable post-regulation A circuit, system and method determine the control voltage for a DC-DC converter. A control module determines a raw battery voltage and an operating temperature. It references a look up table to determine a voltage regulator control voltage based on the battery volt... | 01/18/2011 |
| 7821336 | Amplifier device An amplifier device has an amplifier circuit, an energy supply device, a switching matrix and a control device. A radio-frequency, low-energy signal pulse can be amplified into a high-energy power pulse by the amplifier circuit. The amplifier circuit is supplied wit... | 10/26/2010 |
| 7741903 | Distortion-driven power amplifier power supply controller A power amplifier controller measures the distortion of a power amplifier output. Based upon the distortion measured, the supply voltage to the PA is adjusted in a control loop. In one embodiment, distortion is measured by computing the ratio of the measured power i... | 06/22/2010 |
| 7701286 | Multibit digital amplifier for radio-frequency transmission A broadband multibit digital radio-frequency (RF) signal is synthesized digitally. to convert the digital signal to a high-power analog signal for RF transmission. Each bit (or cluster of bits) of the digital signal is first separately amplified using a fast switchi... | 04/20/2010 |
| 7683711 | Voltage regulator for biasing current-to-voltage amplifiers A voltage regulator, comprising an analog amplifier, a noise filter and a signal compensator, is disclosed. The noise filter for receives a first signal containing alternating current (AC) noise in which the noise filter substantially filters the AC noise from the f... | 03/23/2010 |
| 7532067 | Amplifier device with adjustable supply voltage A radio-frequency power amplifier is supplied by a voltage supply device. The voltage supply device has a voltage divider chain that is connected at the input side with a base potential and a ground voltage. The voltage divider chain has a number of Zener diodes con... | 05/12/2009 |
| 7471146 | Optimized circuits for three dimensional packaging and methods of manufacture therefore An embodiment of the present invention provides an apparatus, comprising an integrated circuit, wherein a first portion of the integrated circuit is placed on a top tier substrate and a second portion of the integrated circuit is placed on a bottom tier substrate st... | 12/30/2008 |
| 7420411 | Voltage control circuit and method for supplying an electrical component with a supply voltage A voltage control circuit is proposed, having an input for supplying a voltage control signal and having an output for production of a supply voltage. The voltage control circuit contains a control loop with a DC/DC converter arranged between a first node and a seco... | 09/02/2008 |
| 7420422 | Audio amplifier driven by single voltage source and related voltage supply circuit After coupling a first voltage source to a voltage supply circuit, a second voltage source having a same electrical level but an opposite electrical pole with said first voltage source is generated. An audio amplifier is then driven by both the first voltage source ... | 09/02/2008 |
| 7420414 | Amplifier, and step-down regulator and operational amplifier using the amplifier An amplifier has an input stage amplifying circuit, an output stage amplifying circuit, and a negative feedback circuit. The input stage amplifying circuit differential-amplifies a first input voltage inputted to a positive phase input node and a second input voltag... | 09/02/2008 |
| 7417502 | Selectable power supply for audio amplifier The disclosure is directed to power supplies for audio amplifiers that focus on the importance of certain power supply characteristics in forming the overall qualities of a tube amplifier. The power supplies may use a power transformer with two dissimilar and select... | 08/26/2008 |
| 7397303 | Vacuum tube circuit A vacuum tube circuit is capable of amplifying an input signal with use of a low source voltage. Ordinarily, the amount of electrons released from a cathode which is heated by a heater is small since a voltage supplied to the heater is low. In the vacuum tube circui... | 07/08/2008 |
| 7394233 | High efficiency modulated power supply A modulated power supply comprises a power switching stage having at least one power switching device for generating a power signal in response to an input modulating signal. A current source is positioned in parallel with the power switching stage and continuously ... | 07/01/2008 |
| 7395038 | High-efficiency modulating RF amplifier The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such a manner as to achieve a desired modulation. In one embodiment, the spread between a maximum frequ... | 07/01/2008 |
| 7392021 | Apparatus, system, and method for measuring power delivered to a load Apparatus, system, and method including a circuit including an element having an electrical impedance, an input node to receive a signal, and an output node to couple to a load; a sensing circuit coupled to the input node and the output node to sense a differential ... | 06/24/2008 |
| 7372918 | Transmission device with adaptive digital predistortion, transceiver with transmission device, and method for operating a transmission device The invention provides a transmission device having adaptive digital predistortion, which has a transmission path and a feedback path. The transmission path contains a predistortion unit which takes a derived control signal (LS) and baseband signals applied to the i... | 05/13/2008 |
| 7373116 | High output power radio frequency integrated circuit A high output power radio frequency integrated circuit (RFIC) includes an up-conversion module, a plurality of power amplifier input stages, and a plurality of integrated circuit pads. The up-conversion module is coupled to convert a low intermediate frequency (IF) ... | 05/13/2008 |
| 7368874 | Dynamic depressed collector A biasing system for use with a multi-stage depressed collector of a high power amplifier includes one or more adjustable power sources. A power controller provides control signals to the power sources depending on the operational RF power level. For low power appli... | 05/06/2008 |
| 7369837 | Frequency-mixing method and frequency-mixing device using the same A frequency-mixing method includes a step of generating a first quadrature signal having a predetermined frequency, a second quadrature signal having a phase difference of about 180 degrees with respect to a phase of the first quadrature signal, a third quadrature s... | 05/06/2008 |
| 7369816 | Highly accurate temperature sensor employing mixed-signal components A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry ... | 05/06/2008 |
| 7349679 | Integrated power amplifier A power amplifier develops a modulated high power signal by summing the outputs of multiple voltage controlled oscillators. A phase control circuit synchronizes the phase relationship of multiple voltage controlled oscillators. The voltage control oscillators provid... | 03/25/2008 |
| 7342457 | Cross-differential amplifier A cross-differential amplifier is provided. The cross-differential amplifier includes an inductor connected to a direct current power source at a first terminal. A first and second switch, such as transistors, are connected to the inductor at a second terminal. A fi... | 03/11/2008 |
| 7342458 | Negative gain transductance amplifier circuit The invention proposes a negative gain transconductance amplifier circuit (1) for capacitive load that includes: an RC serial circuit connected between an input terminal (E) of the amplifier circuit and a intermediate terminal (A); an amplificat... | 03/11/2008 |
| 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 |
| 7333564 | High frequency power amplifier circuit The present invention provides a high frequency power amplifier circuit capable of obtaining sufficient detection output even in a range where a request output power level is low and performing a desired output power control by a control loop with the detection outp... | 02/19/2008 |
| 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 |
| 7315152 | System for detecting current in an output stage of a power amplifier A system for detecting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal is provided. In general, the mobile terminal includes power amplifier circuitry, power control circuitry, current detection circuitry, and an inducto... | 01/01/2008 |
| 7276971 | Multi-operational amplifier system A multi-operational amplifier system comprises a plurality of operational amplifiers and a controller to configure the plurality of operational amplifiers. The operational amplifiers may be selectively configured to operate individually or in combination with other ... | 10/02/2007 |
| 7271390 | Imaging systems and methods including an alternating pixel arrangement An imaging system includes a plurality of gate lines, a plurality of data lines, a common ground line, a plurality of capacitors and an array of pixels that are alternately arranged so that the common ground line is shared by the plurality of capacitors and shared b... | 09/18/2007 |
| 7259630 | Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an... | 08/21/2007 |
| 7239206 | Ultracapacitor audio amplifier An amplifier that employs ultracapacitors to accommodate the peak power needs of an electrical system, such as car audio system. The amplifier operates off of a primary power source for average signal power levels and then uses the ultracapacitors when operating at ... | 07/03/2007 |
| 7236753 | Direct outphasing modulator Embodiments of the invention describe a modulator having first and second synthesizers, for example, fractional-N synthesizers, that generate first and second outphased modulated signals with aligned phases. Embodiments of the modulator may align the phases of the o... | 06/26/2007 |
