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7073113 |
Adaptive sigma-delta modulation with improved dynamic range
An adaptive sigma-delta modulation and demodulation technique, wherein a quantizer step-size is adapted based on estimates of an input signal to the quantizer, rather than on estimates of an input...
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7068068 |
Re-configurable mixed-mode integrated circuit architecture
An analog portion of a mixed-mode integrated circuit system includes a plurality of analog input cells, a plurality of analog output cells, and an interconnect array. The input cells are configured...
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7068197 |
ADC with reduced quantization noise and programmable bit resolution
An improved sigma-delta converter includes a post converter filter portion that receives digital data streams. The post converter filter portion is programmable to receive digital data streams of...
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7068198 |
Double-sampled integrator system and method thereof
A double-sampled feedback integrator system includes a sampling module having multiple switched capacitors. The switched capacitors of the integrator system are opened and closed based upon a...
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7064697 |
Photonic sigma delta analog-to-digital conversation employing dual heterojunction thyristors
Interference caused by the propagation of a transmit signal transmitted from a transmit antenna to a receive antenna is effectively cancelled by an improved signal cancellation system. The system...
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7065142 |
ADSL encoder and decoder
The present invention is an ADSL encoder and decoder. Wherein, the ADSL encoder comprises a digital signal processor, a buffer, a bit extractor and a constellation point mapper. The digital signal...
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7064698 |
Circuit arrangement and method for sigma-delta conversion with reduced idle tones
The circuit arrangement has a sigma-delta converter ( 2 ) for converting an analog input signal into a digital output signal. The sigma-delta converter ( 2 ) contains a loop filter, a comparator...
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7061416 |
Adaptive-type sigma-delta A/D converter
A sigma-delta A/D converter includes an A/D converter configured to output a digital signal, a signal-magnitude detecting circuit coupled to the output of the A/D converter to output a control...
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7061415 |
Word length reduction circuit
The present invention relates to noise shaping, especially although not exclusively for digital audio signal processing; and in particular for PCM-PWM converters in a digital amplifier. The present...
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7062340 |
Audio data processing systems and methods utilizing high oversampling rates
A method of processing digital audio data includes receiving an input stream of audio data having a first quantization and a high oversampling rate. The input stream is requantized in a first...
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7061989 |
Fully digital transmitter including a digital band-pass sigma-delta modulator
A digital transmitter ( 20 ) that may be advantageously used in a high-frequency transceiver, such as a wireless telephone handset, is disclosed. The transmitter ( 20 ) includes digital upconverter...
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7058463 |
Method and apparatus for implementing a class D driver and speaker system
An audio path is constructed to include a multi-bit sigma-delta converter for converting an N-bit digital input to an n-bit output representing an over-sampled, lower resolution n-bit version of...
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7057541 |
Delta-sigma modulator using LC resonators
A bandpass continuous-time delta-sigma modulator. The filters of the modulator are LC resonators directly connected in series. Direct connection of the resonators eliminates the need for active...
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7057540 |
Sigma-delta (ΣΔ) analog-to-digital converter (ADC) structure incorporating a direct sampling mixer
A sigma-delta analog-to-digital converter-offers advantages such as noise shaping and high frequency operation. However, a sampling circuit needed to provide a highly oversampled discrete-time...
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7053807 |
Apparatus and method for controlling the state variable of an integrator stage in a modulator
An apparatus for controlling the state variable of an integrator stage in a modulator including a detector circuit for generating an overload signal when the modulator is overdriven, a control...
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7049990 |
Single loop feed-forward modulator with summing flash quantizer and multi-bit feedback
A sigma-delta modulator includes a summing junction that receives an input signal. A plurality of integrators are arranged in series, the integrators output an integrated signal value to a...
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7049991 |
Semiconductor device, digital-analog converter and display device thereof
A semiconductor device having a voltage-current conversion function, a digital-analog conversion function, and a gamma correction function is provided. A digital input signal (voltage) is input...
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7046046 |
Switched capacitor signal scaling circuit
A signal scaling circuit for accurately reducing the effective amplitude of an input signal by a rational factor N/M, where N and M are integers and N<M, is disclosed. An input, reference, bias...
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7046177 |
Servo system, apparatus comprising a servo system, sigma delta modulator, and integrated circuit comprising a sigma delta modulator
A servo system comprising an analog sigma delta modulator for generating a normalized digital error correction signal from first and second analog control signals. The sigma delta modulator...
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7046173 |
Method and device for converting a quantized digital value
The invention concerns a method and a device for converting an input digital value quantized in accordance with a first quantization factor and encoded on at most n1 bits, into an output digital...
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7046181 |
2n-1 Shuffling network
A 2 n −1 shuffling network includes a shuffle exchange network for receiving 2 n −1 data inputs and a dummy input and providing 2 n outputs; a replacement set of 2 n −1 data switches for...
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7046183 |
Method and apparatus for alias suppressed digitizing of high frequency analog signals
A method and apparatus for sampling an analog input signal and storing digital values in a memory, wherein a sequence of clock pulses is generated at a predetermined frequency and a pseudo-random...
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7042377 |
Analog-to-digital sigma-delta modulator with FIR filter feedback
An analog-to-digital sigma-delta modulator for converting analog input signals to digital output signals comprises a feedback path ( 1, 101, 201 ) for producing analog feedback signals that are a...
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7042375 |
System and method using dither to tune a filter
A system and method is used to tune filters, for example, analog filters in a sigma-delta modulator ADC. A known dither signal is used, for example a digital dither signal. Through adding of the...
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7038606 |
Digital signal processing device and audio signal reproduction device
An audio signal reproduction device of the invention has a seventh-order delta-sigma modulation circuit that receives a PCM signal and that performs delta-sigma modulation on the PCM signal, a PWM...
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7038604 |
Superconducting multi-stage sigma-delta modulator
There is provided a superconducting multi-stage sigma-delta modulator including a first superconducting sigma-delta modulator having a first integrator and a first comparator and outputting a...
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7038607 |
Modulation circuit having improved performance in the audio band
A modulator circuit receives a modulator input signal and produces a mapper output signal. The modulator circuit includes a filter circuit that generates an output that is a function of the...
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7034727 |
Bandpass sigma-delta modulator
A bandpass sigma-delta modulator using acoustic resonators or micro-mechanical resonators. In order to improve resolution at high frequencies, acoustic resonators or micro-mechanical resonators are...
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7034726 |
Data converter
A data converter comprises a discrete-time sigma delta modulator e.g. for driving a Class-D power amplifier. The low-pass filter of the sigma delta modulator is modified by adding a suitably...
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7034725 |
Method for self-calibrating a phase integration error in a modulator
A method of self-calibrating a modulator includes at least one integrator likely to incur a phase error may include reading a pulse response of the modulator, calculating a phase error parameter of...
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7034730 |
Pipelined delta sigma modulator analog to digital converter
A pipelined delta-sigma modulator (PDSM) analog to digital converter (ADC) architecture is disclosed where each stage of the pipelined ADC includes a delta sigma modulator with a digital low pass...
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7034728 |
Bandpass delta-sigma modulator with distributed feedforward paths
A delta-sigma modulator. The novel delta-sigma modulator includes one or more filter stages arranged in cascade, wherein each filter stage includes a first circuit for generating a first output...
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7034731 |
A/D converter apparatus and D/A converter apparatus including a digital filter
An A/D converter apparatus for converting an analog signal output from an anti-aliasing filter into a digital signal, a sinc filter for removing a frequency component corresponding to an aliasing...
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7034729 |
Adding circuit suitable for sigma-delta modulator circuits
An adding circuit includes storage capacitors and a a switch mechanism, the storage capacitors being charged up via voltage signals to be added during a first clock phase. During a second clock...
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7030798 |
State-delayed technique and system to remove tones of dynamic element matching
A filter structure used with a dynamic element matching encoder for a sigma-delta digital-to-analog converter is presented. A sampled input sequence having undesired frequency tones is divided into...
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7030792 |
Suppressing digital-to-analog converter (DAC) error
A digital-to-analog converter (DAC) error suppression arrangement suppresses DAC error arising from mismatched elements contained in a DAC ( 640 and/or 645 ) that is part of a modulator (FIG. 6...
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7030797 |
Broadband sigma-delta modulator
A sigma-delta modulator converting digital input signals x(k) includes a first feedback loop of a spectrally formed output signal y(k) of the sigma-delta modulator and a second feedback loop of a...
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7026970 |
Method and system for a multi-rate analog finite impulse response filter
Provided are a system and method for implementing a multirate analog finite impulse response (FIR) filter. A system of the present invention includes a modulator having a first adder and a...
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7023369 |
Multiplexed-input-separated sigma-delta analog-to-digital converter design for pixel-level analog-to-digital conversion
An image-sensing element has an array of photodiodes or other photodetecting elements and performs sigma-delta analog-to-digital conversion on the outputs of the photodetecting elements. The...
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7019675 |
System and method for minimizing crosstalk between signals of photoconductive elements
An array of photoconductive elements comprises an array of radiation detectors; an electrical lead connected to the array of radiation detectors; at least one amplifier receptive of an output...
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7015843 |
Sigma-delta converter with noise suppression
A digital input signal passes through a principal path, containing at least one sigma-delta modulator having a transmission function and a digital-to-analog converter, and at least one parallel...
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7015850 |
Bandwidth limited sampling circuit of high linearity
A bandwidth limited sampling circuit of high linearity may be implemented by using a first circuit portion to limit the bandwidth of the input signals, and using a second circuit portion to sample...
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7016421 |
Time-interleaved delta sigma analog to digital modulator
A Delta-Sigma Analog-to-Digital Converter (ADC) that can have a very high sampling rate (over 100 GHz) and which is preferably optically sampled to help achieve its very high sampling rate. The...
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7015844 |
Minimized SAR-type column-wide ADC for image sensors
An improved analog-to-digital converter wherein a minimal amount of circuitry is provided for conversion of an analog signal to a series of digital bits. A comparator is provided for generating...
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7009541 |
Input common-mode voltage feedback circuit for continuous-time sigma-delta analog-to-digital converter
A novel circuit is used to monitor the common-mode voltage at the summing junctions of the first integrator in a continuous-time ΣΔ ADC, wherein the circuit produces a control voltage which...
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7009540 |
Method for designing a noise shaper with a single loop distributed feedback delta-sigma modulator
A method for designing a noise shaper with a single loop distributed feedback delta-sigma modulator includes following steps: (a) determining a delta-sigma modulator comprising a plurality of...
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7009539 |
Modulator providing only quantization error component to delta sigma modulator
A ΔΣ modulator modulates only an error component separated by a component separating portion. Therefore, even if the number of order of the ΔΣ modulator increases, an amplitude of an output of...
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7009543 |
Multiple non-monotonic quantizer regions for noise shaping
A signal processing system having a multiple non-monotonic regions quantization transfer function can improve overall delta sigma modulator performance. The non-monotonic quantization transfer...
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7006022 |
System and method for enhancing data correction capability using error information obtained from demodulation procedures
A signal processing system that comprises a sampling device for converting a continuous signal into a discrete signal, a quantizing device for converting the discrete signal into a first bit...
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7006024 |
Variable modulus interpolator, and a variable frequency synthesiser incorporating the variable modulus interpolator
An indirect variable frequency synthesiser for synthesising selectable frequencies from a reference frequency including a multi-divisor programmable frequency divider located in a feedback loop of...
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