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| Number | Title | Issue Date |
| 8183931 | Amplifier circuit and methods of operation thereof A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control si... | 05/22/2012 |
| 8164388 | Amplifying apparatus An amplifying apparatus amplifies an input signal supplied to an input terminal and outputs an output signal from an output terminal. The apparatus includes a high-potential power supply line through which a high voltage is supplied; a low-potential power supply lin... | 04/24/2012 |
| 8159304 | Apparatus and method for feed-forwarding in a current-feedback amplifier A current-feedback amplifier with at least one feed-forward capacitor at the input stage of the current-feedback amplifier is provided. In one embodiment, the current-feedback amplifier and feed-forward capacitor(s) are arranged as follows. The input stage includes ... | 04/17/2012 |
| 8159305 | Amplifying device An amplifying device includes a selecting section that selects one of a first power source potential and a second power source potential which are different from each other, a potential generating circuit that generates a third power source potential from the power ... | 04/17/2012 |
| 8149061 | Class H amplifier A class H amplifier circuit includes a Buck converter 20 and a charge pump 30 which are used to generate voltages which are used in turn to power an output driver 10. A feedback path 36 controls the loop. The circuit is particularly suita... | 04/03/2012 |
| 8138837 | Efficient power amplifier A dynamic power supply for N amplifiers includes first and second power boost circuits which temporarily boost the positive or negative power supply rail, respectively. A control circuit monitors amplifier output signal levels and provides power boost control signal... | 03/20/2012 |
| 8130042 | Methods and devices for leakage current reduction Methods and devices for leakage current reduction are described. A regulator transistor is connected to a switch to bias the transistor with a first voltage during an ON state and a second voltage during the OFF state of the transistor. The switchable bias allows le... | 03/06/2012 |
| 8106713 | Power amplifier with stabilising network A power amplifier circuit comprising a transistor for receiving a signal to be amplified at an input and for outputting an amplified signal at an output; a modulated power supply connected to the transistor output; and a resistive element connected at the transistor... | 01/31/2012 |
| 8093953 | Amplifier system with digital adaptive power boost An amplifier system with digital adaptive power boost includes a charge pump for providing a power supply to an amplifier. The charge pump may switch between a fixed input DC voltage and a boosted value for a certain period of time in response to an increase in an i... | 01/10/2012 |
| 8085095 | Switched capacitor voltage converter for a power amplifier A voltage converter includes a plurality of capacitors and corresponding first switch elements, the capacitors coupled in series and arranged to each charge to a voltage level during a first clock period, the voltage level determined by a supply voltage level, the n... | 12/27/2011 |
| 8022770 | System and method for preventing power amplifier supply voltage saturation A system for preventing power amplifier supply voltage saturation includes a multiple stage voltage regulator configured to provide a regulated voltage, a power amplifier configured to receive the regulated voltage, and a saturation protection circuit configured to ... | 09/20/2011 |
| 8018286 | Low power integrated circuit The present invention relates to an integrated electrical circuit in particular a receiver or driver suitable for broadband communication, such as optical interconnect. The circuit comprises two amplifiers which share current supply wherein the integrated circuit is... | 09/13/2011 |
| 8008975 | Gate-boosted, variable voltage supply rail amplifier In at least one embodiment, an electronic system includes an amplifier having an on-chip charge pump to provide a gate boost voltage to boost a gate voltage of at least one on-chip field effect transistor (FET) of an output stage of an amplifier. In at least one emb... | 08/30/2011 |
| 8004366 | Area and power efficient, high swing and monolitihic ground centered headphone amplifier circuit operable on a low voltage A minimal area, power efficient, high swing and monolithic ground centered headphone amplifier circuit operable on a low voltage. An input amplifier stage includes a first input terminal and a second input terminal and having a first gain. An output amplifier stage ... | 08/23/2011 |
| 7999621 | 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... | 08/16/2011 |
| 7994863 | Electronic system having common mode voltage range enhancement An electronic system generates at least one floating supply voltage, wherein during operation of the circuit the floating supply voltage tracks a common mode voltage of first and second differential input signals. By tracking the common mode voltage, in at least one... | 08/09/2011 |
| 7994864 | Audio out unit A DC-coupled audio out unit is provided, including at least one regulator and at least one audio amplifier. The regulator is coupled to at least one power terminal of the audio amplifier. ... | 08/09/2011 |
| 7915961 | Power amplifier multiple stage control for polar modulation circuit A power amplifier is provided that includes a plurality of stages. Each of the stages is capable of being controlled by a first supply voltage or a second supply voltage. The first supply voltage is provided by a linear amplifier, and the second supply voltage is pr... | 03/29/2011 |
| 7880548 | Headphone amplifier circuit A class G headphone amplifier circuit with improved power efficiency and low EMI. It may use an automatic signal level detector to detect the signal level of incoming signals and determine positive and negative power supplies for headphone amplifiers accordingly. A ... | 02/01/2011 |
| 7872533 | Leakage current reduction in a power regulator A regulator with decreased leakage and low loss for a power amplifier is described. Switching circuitry is used to connect the regulator input bias to a bias control voltage when the power amplifier is to be operated in an on condition or to a voltage generator when... | 01/18/2011 |
| 7847637 | High efficiency precision amplifier A high efficiency precision amplifier which comprises a linear amplifier stage, a class D amplifier stage and a set of switches is provided. Both amplifier stages receive the same input signal. The load is driven by the output of the linear amplifier stage. The set ... | 12/07/2010 |
| 7834702 | Efficient power amplifier A dynamic power supply for N amplifiers includes first and second power boost circuits which temporarily boost the positive or negative power supply rail, respectively. A control circuit monitors amplifier output signal levels and provides power boost control signal... | 11/16/2010 |
| 7830209 | Signal level selected efficiency in a charge pump power supply for a consumer device audio power output stage A charge pump power supply for a consumer device audio power stage has an efficiency selected according to signal level. The frequency of operation of the charge pump and/or the effective size of a switching transistor bank is adjusted based upon a volume (gain) set... | 11/09/2010 |
| 7808324 | Operating environment and process position selected charge-pump operating mode in an audio power amplifier integrated circuit A charge pump power supply for an audio power amplifier integrated circuit has an operating mode selected according to an indication of operating environment and/or a process position of the integrated circuit. The operating mode selects the output voltage provided ... | 10/05/2010 |
| 7808323 | High-efficiency envelope tracking systems and methods for radio frequency power amplifiers High-efficiency envelope tracking (ET) methods and apparatus for dynamically controlling power supplied to radio frequency power amplifiers (RFPAs). An exemplary ET circuit includes a switch-mode converter coupled in parallel with a split-path linear regulator. The ... | 10/05/2010 |
| 7804364 | Absolute power detector A method and apparatus is provided for detecting the output power of a power amplifier. The output power is detected by detecting the absolute values of the voltage and current at the output of the amplifier and mixing the detected voltage and current to generate a ... | 09/28/2010 |
| 7782141 | Adaptive signal-feed-forward circuit and method for reducing amplifier power without signal distortion Digital amplifying circuitry delays a digital data signal (INR) to produce an output signal (VoutR). The delayed digital data signal is converted to an analog signal (VinR) for amplifying by an amplifier (10R). Signal amplitud... | 08/24/2010 |
| 7760026 | Switched capacitor voltage converter for a power amplifier A voltage converter includes a plurality of capacitors and corresponding first switch elements, the capacitors coupled in series and arranged to each charge to a voltage level during a first clock period, the voltage level determined by a supply voltage level, the n... | 07/20/2010 |
| 7755431 | Apparatus for power amplification based on envelope elimination and restoration (EER) and push-pull switching A power amplifying apparatus based on envelope elimination and restoration (EER) includes a voltage amplifier to amplify a high frequency component of an envelope signal, a switching amplifier to generate a low frequency component signal of a drain bias based on a f... | 07/13/2010 |
| 7741913 | Low-loss electrical component with an amplifier An electrical component includes an amplifier that includes an output stage, and a power-supply path for powering the output stage. The power supply path includes a line that includes conductor track sections in parallel. The electrical component also includes a car... | 06/22/2010 |
| 7741914 | Amplifier system with dynamically-adjusted supply voltage An amplifier system may include an output stage configured to provide an amplified output signal at an output thereof based on an input signal, the output stage being connected between first and second supply voltages. A dynamic power supply control system provides ... | 06/22/2010 |
| 7714660 | Amplifier circuit and methods of operation thereof A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control si... | 05/11/2010 |
| 7714661 | Single supply direct drive amplifier A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the o... | 05/11/2010 |
| 7710203 | Transformer-capacitor enhancement circuitry for power amplifiers Circuitry for providing improved pulse-type enhancement of the voltage supplied to a power amplifier (101) that is fed by a power supply that is connected to the power amplifier (101) at a feeding point through a main supply path that is connected via ... | 05/04/2010 |
| 7701293 | Amplifier symmetric supply regulation A power converter receiving a single-sided supply which is ground-terminated and providing a regulated positive supply and a regulated negative supply that is optimized to the expected output range of a class AB amplifier, as well as providing excellent efficiency. ... | 04/20/2010 |
| 7701294 | Apparatus and method for negative boost audio amplifier An audio amplifier with a negative DC/DC converter is provided. The audio amplifier receives VDD and VEE as power supply signals. The negative DC/DC converter is arranged to provide VEE from VDD, such that VEE is a negative voltage that is lower in magnitude than VD... | 04/20/2010 |
| 7679451 | Power supply device for driving an amplifier A power supply device for driving an amplifier includes a power generator for providing a first voltage for a first power reception end of the amplifier, a power conversion unit coupled to the power generator, for converting the first voltage into a second voltage, ... | 03/16/2010 |
| 7667543 | Power supply device for driving an amplifier A power supply device for driving first and second amplifiers includes a first power generator, a second power generator, a charge pump and a control unit. The first power generator provides a first voltage for first power reception ends of the first and second ampl... | 02/23/2010 |
| 7646249 | 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... | 01/12/2010 |
| 7619480 | Distributed class G type amplifier switching method An improved Class G type amplifier is provided which switches between multiple power rails depending upon the instantaneous amplitude of the input signal versus the power rails without excessive distortion. The low voltage (inner) amplifier includes a plurality of p... | 11/17/2009 |
