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Napoleon Bonaparte ; When told of the Robert Fulton steamboat
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| Number | Title | Issue Date |
| 8174316 | Switching amplifier A switching amplifier is disclosed and comprises: a power supply (Vcc); input circuits (Va, Vb); switch transistors (M1, M2) connected with each other in series; driving circuits (I1, I2) coupled with the switch transistors (M1, M | 05/08/2012 |
| 8159299 | Duplicate feedback network in class D amplifiers A circuit and a method are provided for suppressing the pop and click noise during the power on and power off of Class D amplifiers. The technique also suppresses pops and clicks when the Class D amplifier enters or exits standby mode. A duplicate feedback network i... | 04/17/2012 |
| 8154342 | Power amplifier and processing device utilizing the same A processing device including a control unit and a power amplifier is disclosed. The control unit generates a plurality of control signals according to an input signal. The power amplifier includes a plurality of switches. The control signals control the switches to... | 04/10/2012 |
| 8143945 | Switched mode amplifier A switched mode amplifier includes a voltage source, a switched amplifier, a controller and a feedback unit. The switched amplifier sources or sinks a current to or from a load. The load and the current define a voltage over the load. The controller generates contro... | 03/27/2012 |
| 8143944 | Method and apparatus for sensing a current for varying impedance loads Recently, there has been an increased desire to measure load currents of class-D amplifiers to improve performance. The traditional solution has been to include one or more discrete components in series with the load, but this degrades performance. Here, however, ci... | 03/27/2012 |
| 8138832 | Class-D amplifier Class D amplifier is provided. The class D amplifier includes at least a block; each block includes an input circuit, an integrator, a comparator, a driving circuit and two feedback circuits. The input circuit receives a digital input to provide a differential pair ... | 03/20/2012 |
| 8125271 | Power amplifier and bridge circuit in power amplifier A power amplifier and a bridge circuit in a power amplifier, thereinto, the power amplifier includes a comparator, a bridge circuit and a low-pass filter. The comparator is adapted to receive a first analog signal, compare the first analog signal with a reference si... | 02/28/2012 |
| 8093951 | Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency An audio switching power amplifier having an output pulse voltage selected in conformity with an indication of the output signal amplitude provides lower electromagnetic interference (EMI) in class-D amplifier implementations, in particular, in inductor-less designs... | 01/10/2012 |
| 8072266 | Class G amplifier with improved supply rail transition control An apparatus and method are provided for a Class G amplifier that includes an output stage, where an output stage supply voltage is selected based upon an input signal voltage of the output stage. The amplifier may also include an input stage coupled to the output s... | 12/06/2011 |
| 8054130 | Method for measuring the saturation rate of an audio amplifier A method and corresponding circuit that adjusts the gain of an audio output stage having a class D amplifier, this method including the steps of setting the gain to a nominal value, analyzing an output signal during successive clock periods, counting the number of c... | 11/08/2011 |
| 8049561 | Class D amplifier The invention refers to an amplifier (1) comprising a switchable capacitive divider (10) for dividing a supply voltage delivered to the amplifier (1), the switchable capacitive divider being coupled to a coupling circuit (15) via a first ... | 11/01/2011 |
| 8044719 | Class D amplifier circuit A class D amplifier circuit for generating a pulse signal whose pulse width is modulated in response to an input signal, the class D amplifier circuit includes first to fifth switching elements, a first capacitance element and a control section. The control section ... | 10/25/2011 |
| RE42846 | Close-loop class-D audio amplifier and control method thereof The present invention discloses a Class-D power amplifier and control method thereof. In one embodiment, the amplifier feeds back the signal at the output node to the inverting input of the comparator, and provides a high frequency triangular wave signal to the non-... | 10/18/2011 |
| 8040185 | Amplifying device The present invention concerns an amplifying device arranged to receive an input signal having a certain duty cycle. The amplifying device comprise a first switching unit having an input terminal adapted to receive a first half of the input signal, and an output ter... | 10/18/2011 |
| 8040183 | Turn-on/turn-off snubber for a metallic-oxide-semiconductor field-effect transistor (MOSFET) class-D power amplifier The present invention is an H-bridge power amplifier circuit which includes diodes connected in parallel with MOSFET switch pairs of the circuit, each MOSFET switch pair including a MOSFET switch and a reverse-conduction blocking switch. Further, the circuit include... | 10/18/2011 |
| 8040184 | Class-D amplifier A class-D amplifier includes a differential integrator that integrates a difference between an input signal and a feedback signal to output an integration value signal, a pulse width modulation circuit that outputs a digital signal having a pulse width corresponding... | 10/18/2011 |
| 8018280 | Thermal regulation of a class-D audio amplifier A class-D audio amplifier is protected by thermal regulation which decreases the gain of the class-D audio amplifier by asserting an over-temperature signal when the temperature of the class-D audio amplifier is detected to be higher than a threshold. The output of ... | 09/13/2011 |
| 8018279 | Class D amplifier circuit with bi-directional power switch A Class D amplifier circuit in accordance with an embodiment of the present application includes a converter stage operable to provide a desired AC voltage and a Class D amplifier stage, connected to the converter stage. The Class D amplifier stage includes a first ... | 09/13/2011 |
| 8013678 | Hybrid feedback controlled oscillation modulator and switching power amplifier system A Hybrid feedback Controlled Oscillation Modulator (HCOM) is disclosed, having a 1st feedback path from the output voltage of the switching stage and a second feedback path from the filter output, the two feedback paths being superposed to provide a weigh... | 09/06/2011 |
| 8004360 | Close-loop Class-D audio amplifier and control method thereof The present invention discloses a Class-D power amplifier and control method thereof. In one embodiment, the amplifier feeds back the signal at the output node to the inverting input of the comparator, and provides a high frequency triangular wave signal to the non-... | 08/23/2011 |
| RE42612 | Switched-mode power amplifier using lumped element impedance inverter for parallel combining A switched-mode Class F power amplifier is provided for parallel connection with at least one other like amplifier, within a Chireix architecture, for combining the signals output therefrom. An input component includes at least one active device configured to be alt... | 08/16/2011 |
| 7994857 | Dynamic constant power amplifier A switching amplifier including a voltage sensor circuit connected to a high voltage supply rail for measuring the power supply voltage. A current sensor circuit is connected to the high voltage supply rail for measuring the power supply current. An error amplifier ... | 08/09/2011 |
| 7990215 | Class D amplifier control circuit and method Circuit and method for a Class D amplifier. In one exemplary embodiment, an audio amplifier is disclosed. A closed loop configuration for driving high and low side driver transistors is provided, each circuit is compatible with advanced sub micron semiconductor proc... | 08/02/2011 |
| 7986187 | Versatile audio power amplifier An audio power amplifier includes a first and a second amplification unit, each including a switching voltage amplifier, an output filter, a current compensator, an inner current feedback loop feeding a measurement of current measured at the output inductor back to ... | 07/26/2011 |
| 7982536 | Single ended class-D amplifier with dual feedback loop scheme A single-ended class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit, an output driver and an inverter. The output driver cooperates with the inverter to produce a differential sign... | 07/19/2011 |
| RE42448 | Switched-mode power amplifier integrally performing power combining A switched-mode power amplifier is configured for performing power amplification of a plurality of signals input thereto and integrally summing (combining) those signals. Conceptually, this is achieved by replacing the input winding of the transformer component of a... | 06/14/2011 |
| 7956684 | Class-G radio frequency power amplifier A linear Radio Frequency power amplifier with improved efficiency and bandwidth is provided using two power amplifier devices, operating in a Class-G mode of operation. ... | 06/07/2011 |
| 7952432 | Class-D amplifier A class-D amplifier includes a differential integrator that integrates a difference between an input signal and a feedback signal to output an integration value signal, a pulse width modulation circuit that outputs a digital signal having a pulse width corresponding... | 05/31/2011 |
| 7948312 | Multi-bit class-D power amplifier system Techniques for designing an efficient power amplifier are described. In one aspect, multiple single unit instance class-D power amplifiers with coupled outputs are utilized to increase efficiency and reduce quantization noise. In another aspect, multiple groups of s... | 05/24/2011 |
| 7948313 | Class D amplifier circuit A class D amplifier circuit includes a signal generation section that generates a first pulse width modulation signal and a second pulse width modulation signal based on an input signal. When a level of the input signal is zero, the signal generation section generat... | 05/24/2011 |
| 7944297 | Class D amplifier A class D amplifier including a PWM circuit, a buffer amplifying circuit, a low-pass filter, and two current sources is provided. The PWM circuit transfers an analog signal into a PWM signal. The buffer amplifying circuit amplifies the PWM signal and generates an am... | 05/17/2011 |
| 7936216 | True current limiting The invention relates to a current limiting method, e. g. for Class D amplifiers comprising a unique detection- and control method. The current detection circuit can be implemented as a voltage measurement where the measured voltage corresponds to the current flowin... | 05/03/2011 |
| 7932779 | D-class amplifier A D-class amplifier that can suppress noise generated when a D-class amplification operation is started/stopped. When a D-class amplification operation is started/stopped, the pulse widths and pulse interval of output signals Pout1, Pout2 are gradually... | 04/26/2011 |
| 7924091 | Class-D transconductance amplifier The invention relates to a class-D audio amplifier. The class-D audio amplifier is configured in a current feedback mode as a voltage-controlled current source and a passive inductor/capacitor (LC) reconstruction filter. A portion of the passive LC reconstruction fi... | 04/12/2011 |
| 7911273 | Reduction of power consumption and EMI of a switching amplifier A switching amplifier has a network including current sources and resistors connected to the two output terminals of the H-bridge of the switching amplifier, to provide a small current to the load connected between the two output terminals at zero input, whereby the... | 03/22/2011 |
| 7907010 | Digital amplifier Recently, the use of class-D audio amplifiers has become more and more widespread. In contrast to the generally employed class-AB linear amplification technology, class-D allows for improved efficiency. However, the class-D principle is known for its poor distortion... | 03/15/2011 |
| 7889002 | Power amplifier The invention refers to a power amplifier comprising a first transistor (MH) having a first main channel coupled between a positive power supply terminal (Vdd) and an output terminal (Vout), said first transistor having a control ter... | 02/15/2011 |
| 7889003 | Class-D amplifier The invention describes a power amplifier comprising a first transistor (MHS) having a first control terminal and a first main current path coupled between a first supply terminal (Vdd) and a first node (VH), a second transistor (MLS) having a ... | 02/15/2011 |
| 7859337 | Wideband driver for class-D power amplifiers A Class-D amplifier having a wideband driver circuit including a first transmission line transformer and a second transmission line transformer. An input of the first transmission line transformer is approximately 180 degrees out of phase from an input of the second... | 12/28/2010 |
| 7852156 | Class-D power amplifier having distortion-suppressing function A Class-D power amplifier having a distortion-suppressing function includes a gain control unit, a first PWM unit, a second PWM unit, a current control unit, and a level control unit. The level control unit includes at least one D flip-flop and at least one XNOR gat... | 12/14/2010 |
