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| Number | Title | Issue Date |
| 7183772 | Ion detector A charge detector includes an outer housing having an entrance aperture. Within the housing is disposed a charge capture element that is electrically isolated from the outer housing. The charge capture element includes a plurality of apertures, such as provided by a... | 02/27/2007 |
| 7183818 | Triangular wave generating circuit adapted to class-D amplifier A triangular wave generating circuit adapted to a class-D amplifier is designed not to use a PLL circuit and to secure robustness regarding an amplification gain irrespective of variations of voltages, thus producing a high-quality triangular wave with a simple circ... | 02/27/2007 |
| 7180384 | Universal signal modulators Universal signal modulators structures are shown which are particularly useful for selectively generating polar-modulated digital sequences from input phase and amplitude symbols and for generating quadrature-modulated digital sequences from input first and second q... | 02/20/2007 |
| 7181438 | Database access system An improved human user computer interface system, wherein a user characteristic or set of characteristics, such as demographic profile or societal “role”, is employed to define a scope or domain of operation. The operation itself may be a database search, to int... | 02/20/2007 |
| 7180439 | Multi-path digital power supply controller A multi-path digital power supply controller includes a first ADC (ADC1) coupled to the supply's output voltage Vout and arranged to provide an output which varies with Vout's low frequency components, and a second ADC (ADC2) coupled to Vo... | 02/20/2007 |
| 7180365 | Class D amplifier and a method of pulse width modulation A class D amplifier and a method of pulse width modulation are provided. The class D amplifier includes a sigma delta modulator, a reference signal generator, a pulse width modulator and an amplifier. The sigma delta modulator converts an M bit input signal into N b... | 02/20/2007 |
| 7176669 | Switching regulator with frequency modulation to vary frequency based on a load condition, and control method therefor In a frequency modulation type switching regulator for producing an output voltage to a load, an error amplifier produces an error voltage indicative of a difference between the output voltage and a reference voltage. A switching device is turned on and off at a swi... | 02/13/2007 |
| 7177605 | Power amplification device, in particular for a cellular mobile telephone A power amplification device includes an input for receiving a signal having a useful or desired frequency band, and power amplification circuitry of the delta-sigma type connected to the input. The power amplification circuitry exhibits an order greater than or equ... | 02/13/2007 |
| 7173550 | Circuits, systems and methods for volume control in low noise 1-bit digital audio systems A method of amplitude control in a 1-bit digital system includes the step of scaling the stream of 1-bit data by a scaling factor corresponding to a selected output amplitude. The scaled data is modulated and the resulting modulated, scaled data is converted from di... | 02/06/2007 |
| 7173483 | Low-distortion tri-state switching amplifier A switching amplifier includes a level shifting circuit for adjusting a voltage level of an original input signal to generate a first input signal and a second input signal. The first input signal is identical to the original input signal except for referring to a f... | 02/06/2007 |
| 7171011 | Acoustic drive circuit An acoustic drive circuit for driving a headphone for converting variation of magnetic force, occurring to a voice coil, in sound, and outputting the sound, includes a power amplifier for amplifying a signal at a frequency within the speech band, and outputting the ... | 01/30/2007 |
| 7170434 | Look-ahead delta sigma modulator with quantization using natural and pattern loop filter responses A look-ahead delta sigma modulator reduces and simplifies the computations used to generate quantizer output values. Superposition can be applied to a loop filter response of the look-ahead delta sigma modulator. By superposition, the complete loop filter response f... | 01/30/2007 |
| 7171241 | Data transmission method and arrangement A method for determining weight factors of antenna beams, the method comprising using at least one directional antenna beam implemented with an antenna array to establish a radio link, forming a radio cell with the antenna beam, dividing the radio cell into at least... | 01/30/2007 |
| 7170360 | Device and method for digital pulse width modulation The present invention provides a device for digital pulse width modulation with: (a) a filter device (11) for filtering a filter input signal (10″); (b) a quantization device (13) for quantizing a filter output signal (11′) of the fil... | 01/30/2007 |
| 7170266 | Balanced, floating, spread-spectrum pulse width modulator circuit A fully differential class D amplifier includes a pulse width modulator and a power stage. The pulse width modulator is arranged to employ a differential output signal provided from the power stage as a feedback signal. The pulse width modulator includes a transimpe... | 01/30/2007 |
| 7170339 | Digital amplifier To provide a digital amplifier advantageously performing volume adjustment over a wide range. A first and second field effect transistors include N-channel type field effect transistors. The first field effect transistor has the drain connected to the operation volt... | 01/30/2007 |
| 7170340 | Apparatus and method for a class D audio power amplifier with a higher-order sigma-delta topology A class D power amplifier is provided to drive a low impedance load for audio applications. The amplifier includes a sigma-delta modulator circuit including three or more integrators that are arranged for third or higher order sigma-delta modulation. Also, the sigma... | 01/30/2007 |
| 7170342 | Linear power amplification method and linear power amplifier A combined signal of a digital pilot signal and a digital transmission signal is applied to a digital predistorter (20), wherein it is added with odd-order distortions based on a power series model to generate a predistorted signal, then the predistorted sign... | 01/30/2007 |
| 7167050 | Operational amplifier having large output current with low supply voltage An operational amplifier including a differential input section generating a first signal as a differential voltage between two input signals; an amplifying section amplifying the first signal into second and third complementary signals; a first MOS transistor betwe... | 01/23/2007 |
| 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 |
| 7167048 | Method and apparatus for reducing ripple in class D amplifiers Class D amplifiers are used for their high efficiency, but they have some undesirable characteristics, one of these being the residual switching frequency ripple. Embodiments of the present invention comprise methods and apparatuses for reducing the switching freque... | 01/23/2007 |
| 7167112 | Systems and methods for implementing a sample rate converter using hardware and software to maximize speed and flexibility Systems and methods for converting a digital input data stream from a first sample rate to a second, fixed sample rate using a combination of hardware and software components. In one embodiment, a system includes a rate estimator configured to estimate the sample ra... | 01/23/2007 |
| 7167047 | Multi-channel power amplifier self-configuring to a bridge or single-ended output, particularly for audio applications In a multi-channel amplifier switching from a single-ended to a bridge configuration, one of the two operational amplifiers of the output bridge structure of each channel is kept at the design reference voltage (typically to half the supply voltage) for as long as t... | 01/23/2007 |
| 7164376 | Dual-mode delta-sigma analog to digital converter system and method A dual-mode delta-sigma analog to digital converter system is disclosed that uses a feed forward modulator and includes a low frequency resonator circuit and a high frequency resonator circuit and includes a feed-forward path from the final integrator in the high-fr... | 01/16/2007 |
| 7164893 | Method and apparatus for optimizing supply modulation in a transmitter A transmitter (200) has a compression detector for sensing the level of compression (110) in a signal that is being transmitted. The transmitter also has a radio frequency power amplifier (RFPA) (414) that is supplied by a supply modulator (4... | 01/16/2007 |
| 7164316 | Series-Type Doherty Amplifier Without Hybrid Coupler Provided is a series type Doherty amplifier which includes a first power amplifier and a second power amplifier using a plurality of transformers. The first power amplifier and the second power amplifier are connected in series. The second power amplifier and a firs... | 01/16/2007 |
| 7161818 | High frequency excitation system A power module is adapted to be connected to a voltage source and to supply power to a load. The power module includes a switching bridge that includes a first power transistor and a second power transistor, a first gate controller for driving the first power transi... | 01/09/2007 |
| 7161519 | PWM modulation circuit and class D amplifier using such PWM modulation circuit The PWM modulation circuit according to the invention is connected to an input terminal for an analog baseband signal and a staircase generating circuit generating a staircase wave, and carries out PWM modulation to a staircase wave input from the staircase generati... | 01/09/2007 |
| 7161510 | Switching amplifier comprising a delta-sigma modulation circuit A switching amplifier is provided with a delta-sigma modulation circuit that performs delta-sigma modulation of an input signal that is either an analog signal or a multi-bit signal and outputs a quantized signal, a pulse amplifier that has a switching element and p... | 01/09/2007 |
| 7161424 | Signal output apparatus A signal output circuit for switching an output operation of an input signal is disclosed. The signal output circuit includes a delaying circuit for delaying a control pulse transmitted from outside, an integrating circuit for generating an integrated waveform of th... | 01/09/2007 |
| 7161428 | Method and apparatus for extending the bandwidth of a Class D amplifier circuit Class D amplifiers are used for their high efficiency, but they have some undesirable characteristics that limit their useable bandwidth, one of these being the residual switching frequency ripple. Embodiments of the present invention comprise methods and apparatuse... | 01/09/2007 |
| 7161438 | Electronic circuitry Electronic circuitry for generating and distributing standing wave clock signals. The electronic circuitry includes one or more two-conductor transmission line segments that are interconnected with an odd number of voltage-reversing connections to form a closed loop... | 01/09/2007 |
| 7160426 | Water treatment apparatus The present invention discloses a water treatment apparatus for treating a water flowing in a water pipe, the apparatus comprises an inductive coil, which is sleeved onto said water pipe, and a voltage signal unit, which is electrically connected to the inductive co... | 01/09/2007 |
| 7161423 | Parallel power amplifier and associated methods A method and apparatus is provided for use in power amplifiers where multiple parallel power amplifiers provide various output power levels. By selectively enabling and disabling the parallel power amplifiers and combining their outputs, a desired output power can b... | 01/09/2007 |
| 7161421 | Volume control in class D amplifier using variable supply voltage A Class D audio amplifier including a gain stabilization feedback loop in which volume control is achieved by varying the bus voltage. Changes in the bus voltage are compensated for by complementary changes in the gain of a compensation element in feedback loop so t... | 01/09/2007 |
| 7157969 | Low distortion class D amplifier using a controlled delay An electronic class-D amplifier including a one servo-loop amplifier plus pulse width modulator, and a controlled delay stage including a delay modulation input, and a negative feedback path connects an output of the output switching stage to an input of the servo-l... | 01/02/2007 |
| 7157968 | Method and apparatus for protecting a switching amplifier from excess current A class D switching amplifier has a pulse width modulator that drives a speaker. The amplifier includes an over-current protection circuit, which includes current-monitoring MOSFETs that are each in parallel with one of four power MOSFETs. Signals taken from one sid... | 01/02/2007 |
| 7158843 | Modular software definable pre-amplifier Pre-amplifier apparatus, for use for example in a home hi-fi system, compoosed of one or a plurality of reconfigurable circuits used to configure the apparatus to implement the desired audio processing functions and audio protocols for use in different audio systems... | 01/02/2007 |
| 7157963 | Methods and apparatus for controlling the output voltage of a switched-mode power supply Linear power amplifiers tend to be inefficient. This is a particular problem for RF amplifiers in a cellular base station. In order to improve the efficiency of such amplifiers, attempts have been made to modulate the power supply to the amplifier proportional to th... | 01/02/2007 |
| 7157964 | Multi-output switching amplifier Apparatus and methods for driving multiple output stages with a single switching amplification modulator reduce system cost and complexity. The technique also addresses applications wherein one or more of several output stages of potentially differing output powers ... | 01/02/2007 |
