|
Match
|
Document |
Document Title |
|
|
7006023 |
Sigma-delta modulator with passive bandpass loop filter
Digitizing a signal includes sampling and holding an analog signal to yield a sampled signal, where the analog signal includes information. The sampled signal is filtered at a passive filter...
|
|
|
7003023 |
Digital isolation system with ADC offset calibration
An improved digital capacitive isolation barrier system is provided that is suitable for use in a telephone or modem where the locally powered circuits must be effectively isolated from the public...
|
|
|
7002501 |
Analog-to-digital converter having parametric configurablity
A reconfigurable ADC includes a plurality of reconfigurable blocks for allowing the ADC to provide a plurality of architectures. In one embodiment, the ADC can be configured to operate in a...
|
|
|
7002497 |
Methods and systems for digital dither
Methods and systems for applying digital dither in data converters, such as delta-sigma data converters. In one embodiment, an analog signal from a first path of a delta-sigma modulator is...
|
|
|
6999015 |
Electronic device, a digital-to-analog converter, and a method of using the electronic device
In one embodiment, a D/A converter includes a D/A module and a first differential amplifier. The D/A module converts a digital signal to a first analog signal. The first differential amplifier...
|
|
|
6998910 |
Amplifier using delta-sigma modulation
An amplifier and a driver circuit therefor are presented for driving a load according to a system analog input. The amplifier comprises a passive delta-sigma modulator with a passive filter...
|
|
|
6999014 |
Incremental-delta analogue-to-digital conversion
A method of, and a converter for, converting an analogue input signal (X) to a digital output signal (Y) by incremental-delta conversion in which, at clock intervals, a non-uniform quantizer ( 7 )...
|
|
|
6992606 |
Method and circuit for multi-standard sigma-delta modulator
System and method for a multi-standard sigma-delta modulator. A preferred embodiment comprises an integrator coupled to a signal input, wherein the integrator is configured to sum a difference...
|
|
|
6989778 |
Semi-conductor circuit arrangement
A semi-conductor circuit arrangement for a continuous time sigma delta modulator for adding analog input signals to a digital fed back signal and for quantizing the totalled signal comprises a...
|
|
|
6987474 |
Beamformed ultrasonic imager with delta-sigma feedback control
A method and apparatus are provided for reducing distortion in a dynamically delayed digital sample stream of an imaging system. The method includes the steps of delta-sigma modulating an input...
|
|
|
6987475 |
Audio digital to analog converter with harmonic suppression
A high quality DAC is provided for a lower cost (including the layout size of the circuit on an audio chip) of high end DACs. The DAC includes a first circuit configured to remove even harmonics...
|
|
|
6987473 |
Digital signal-rate converter and systems incorporating same
A digital signal-rate converting system. The system includes a first mechanism for receiving a digital input signal characterized by a first rate. A second mechanism interleaves the digital input...
|
|
|
6985531 |
Dual domain differential encoder/decoder
A method and apparatus that differentially encodes and decodes data symbols in dual domains is taught. Data packets are encoded, transmitted, and decoded during a plurality of symbol intervals on a...
|
|
|
6983011 |
Filter circuit
In a filter circuit of the present invention, a partial quantization value is computed by a quantization circuit according to a spread code and others in a unit at an arbitrary stage, where an...
|
|
|
6982662 |
Method and apparatus for efficient conversion of signals using look-up table
An apparatus and method for conversion of direct stream digital (DSD) signal samples to pulse code modulated (PCM) signal samples using a look-up table. The apparatus includes a first-in-first-out...
|
|
|
6980145 |
System and method for noise cancellation in a signal processing circuit
A system and method for noise cancellation in a signal-processing circuit (e.g., an analog-to-digital converter circuit). Various aspects of the present invention may comprise inputting a first...
|
|
|
6980143 |
Scalable encoder and decoder for scaled stream
A scalable encoder having a first encoder, a decoder and a second encoder includes, above that, a phase distorter to reduce a non-linear frequency-dependent phase distortion introduced by the first...
|
|
|
6980144 |
Method for reducing DAC resolution in multi-bit sigma delta analog-to digital converter (ADC)
A method for reducing the resolution of a digital-to-analog converter in a multi-bit sigma-delta ADC is described. With the addition of digital sigma-delta modulators in the feedback path of a...
|
|
|
6977601 |
Low power current input delta-sigma ADC using injection FET reference
A low power delta-sigma analog to digital converter 10 for converting current mode signals without an amplifier includes an integration capacitor 26, a comparator 30, and a first switch 24 ...
|
|
|
6975257 |
Sigma-delta modulation
Sigma-delta modulation is provided, comprising feeding an input signal to a first SDM, subtracting the output of the first SDM from the input signal, filtering the output of the subtracting to...
|
|
|
6975255 |
Random interleaving dither for sigma-delta analog-to-digital converters
A dithering method is provided for sigma-delta converters in a deep-submicron process. The dither is a random interleaving of quantizer thresholds levels. The random interleaving dither is more...
|
|
|
6975258 |
Circuit for direct digital delta-sigma conversion of variable electrical capacitance
An electronic circuit for the direct conversion of a capacitive transducer signal to a digital delta-sigma bit stream is disclosed. The electronic circuit is comprised of two functional blocks, in...
|
|
|
6972704 |
Sigma-delta modulator with PWM output
The present invention relates to a method for providing an improved generated arbitrary waveform using a sigma-delta modulator with pulse width modulation, said method comprising the steps of...
|
|
|
6972705 |
Signal processing system having an ADC delta-sigma modulator with single-ended input and feedback signal inputs
Signal processing systems described herein include an analog-to-digital delta sigma modulator to process a single-ended input signal using a single-ended analog feedback reference signal. The delta...
|
|
|
6970123 |
Inductorless architecture for a switching amplifier
A switching circuit for generating first and second output signals for differentially driving a load is described. The switching circuit is operable to enforce a minimum pulse width on each of the...
|
|
|
6970126 |
Variable capacitance switched capacitor input system and method
A variable capacitance switched capacitor input system and method includes a differential integrator circuit having first and second input summing nodes and a variable sensing capacitor; one...
|
|
|
6970753 |
Storage and transmission of one-bit data
Apparatus for storing or transmitting a one-bit digital signal comprises an input inverter for inverting a subset of the data bits of an input one-bit digital signal, to generate a bit-inverted...
|
|
|
6970503 |
Apparatus and method for converting analog signal to pulse-width-modulated signal
A circuit for converting an analog signal to a discrete pulse-width-modulated (PWM) signal uses a delta-sigma amplifier and a discrete PWM stage to produce a discrete PWM output signal having lower...
|
|
|
6967608 |
Sigma-delta analog-to-digital converter (ADC) with truncation error cancellation in a multi-bit feedback digital-to-analog converter (DAC)
A method for reducing the complexity of a multi-bit DAC in a sigma-delta ADC. The DAC resolution can be made to be less than that of the quantizer by canceling truncation error present in multi-bit...
|
|
|
6967607 |
Data converters with digitally filtered pulse width modulation output stages and methods and systems using the same
A digital to analog converter including a noise shaping modulator for modulating an input digital data stream, a plurality of output elements for generating a plurality of intermediate data streams...
|
|
|
6967606 |
Loop filter for a continuous time sigma delta analog to digital converter
A loop filter for a continuous time sigma delta analog to digital converter which converts an analog input signal into a digital output signal, said loop filter comprising an active analog filter...
|
|
|
6965336 |
Systems and methods of bidirectional communication across an isolation barrier
A bi-directional isolation scheme is described in which digital data, including clock information, may be communicated bi-directionally across a single isolation barrier without requiring a phase...
|
|
|
6965339 |
Method and system for analog to digital conversion using digital pulse width modulation (PWM)
A system and method for analog-to-digital conversion using digital pulse width modulation (PWM) is disclosed. The method and system according to the disclosed invention converts an analog input...
|
|
|
6965333 |
Circuit for using capacitor voltage divider in a delta-sigma digital-to-analog converter to generate reference voltage
An improved circuit for a delta-sigma digital-to-analog converter comprises integrating operational amplifier, sampling capacitors, integrating capacitor, and a voltage divider consisting of a...
|
|
|
6965335 |
Methods for output edge-balancing in pulse width modulation systems and data converters using the same
A method of performing digital to analog conversion includes generating a pulse width modulated data stream and another pulse width modulated data stream, encoding patterns of the pulse width...
|
|
|
6963297 |
Delta-sigma digital-to-analog converter assembly
Systems and methods are provided for converting a digital signal into an analog signal. A digital-to-analog converter assembly comprises a delta-sigma modulator, a digital-to-analog converter, an...
|
|
|
6962436 |
Digitizing temperature measurement system and method of operation
A digitizing temperature measurement system for providing a digital temperature measurement includes an excitation source for providing switched excitation currents to two or three temperature...
|
|
|
6958723 |
Method and apparatus for reducing noise in analog-to-digital converter devices
An analog-to-digital converter apparatus has a plurality of stages. Each stage includes a residue amplifier having a first and second amplifier unit. Each of the amplifier units has a first input...
|
|
|
6956516 |
A/D conversion circuit, temperature-sensor circuit, integrated circuit, and method of adjusting the temperature-sensor circuit
An A/D-conversion circuit is provided that includes: a counter, which outputs a count value CT; a voltage generation circuit, which generates a monotonically increasing or monotonically decreasing...
|
|
|
6956513 |
Error feedback structure for delta-sigma modulators with improved stability
An error feedback circuit includes a first summer receiving an analog input signal and a feedback signal and outputting a summed signal. A quantizer receives the summed signal and outputs a...
|
|
|
6956514 |
Delta-sigma modulators with improved noise performance
An integrator stage for use in a delta sigma modulator includes an operational amplifier, an integration capacitor coupling an output of the operational amplifier and a summing node at an input of...
|
|
|
6954161 |
Cascade delta-sigma modulator
A delta-sigma modulation quantization loop, comprising an integration circuit for integrating the difference between an analog input signal and a feedback reference voltage, a local quantizer for...
|
|
|
6954159 |
Low distortion band-pass analog to digital converter with feed forward
A low-distortion band-pass delta-sigma analog-to-digital converter (ADC), including an odd-phase sample and hold circuit coupled to a even-phase resonator, improves tolerance to mismatches between...
|
|
|
6954160 |
Filter for digitally processing an analog input signal with analog feedback
A filter is described for digitally processing an analog input signal with analog feedback. In one example, the filter uses a topology similar to a second order universal filter block and includes...
|
|
|
6952176 |
Digital-to-analogue converter circuits
This invention is generally concerned with digital-to-analogue converters and more particularly relates to techniques for reducing signal dependent loading of reference voltage sources used by...
|
|
|
6950049 |
Computer program product for performing digital-to-analog conversion
The present invention is directed to a sigma-delta digital to analog converted (DAC) including a digital-sigma delta modulator, a decimation filter, and a multi-bit DAC. The digital sigma-delta...
|
|
|
6946983 |
Digital-to-analog converter having error correction
The values X(n) input to a current-steering digital-to-analog converter ( 49 ) are modified ( 41 ) before the actual conversion to compensate for conversion errors of the digital-to-analog...
|
|
|
6943715 |
Bandpass sigma-delta analog-to-digital converter and mash-sigma-delta converter incorporating same
The invention concerns a passband Sigma-Delta analog-to-digital converter comprising a first resonator and a second order second resonator, preferably of second order, whereof the respective...
|
|
|
6943717 |
Sigma delta class D architecture which corrects for power supply, load and H-bridge errors
A sigma delta class D device that uses a low pass filter to smooth the output waveform and eliminate high frequency switching noise from the feedback value includes: a first summing node having a...
|
|
|
6943716 |
Variable rate sigma delta modulator
A sigma delta circuit is provided having a sigma delta modulator configured to operate according to a first clock signal and a quantizer connected to the sigma delta modulator, where the quantizer...
|