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7602324 |
A/D converter and method for converting analog signals into digital signals
A method for converting analog signals into digital signals includes the steps of: superimposing a dither value on an analog input signal; sampling the superimposition of the analog input signal...
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7580157 |
High-pass dither generator and method
A method and circuit for generating an M-bit digital dither signal with a substantially uniform probability density function and high-pass spectrum are disclosed. The circuit includes a linear...
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7561085 |
Systems and methods for improving data converters
Systems and methods for improving efficiency of a data converter. An example method generates a noise signal, alters the spectrum of the noise signal based on operation of an associated data...
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7554471 |
System and method for improving linearity of a DAC
A system and method for improving the linearity of a digital-to-analog converter (DAC) is provided. In one embodiment, the system comprises a digital waveform generator that generates a digital...
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7548177 |
Multiple FM dither
Multiple noise-FM dither. An analog dither signal is generated by summing two or more noise-FM signals, each noise-FM signal being a carrier modulated by a noise source.
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7539276 |
Method of processing a sampled spread spectrum signal stream
In accordance with the present invention, a method of processing a sampled signal stream containing at least one spread spectrum signal is provided together with a receiver, computer,...
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7538701 |
System and method for improving dynamic performance of a circuit
A system and method for improving the dynamic performance in an analog-to-digital converter (ADC) by randomizing the differential mismatch. The differential mismatch in an input analog signal is...
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7535391 |
Analog-to-digital converter having random capacitor assignment and method thereof
An analog-to-digital converter (ADC) includes a multiplying digital-to-analog converter (MDAC) having a plurality of capacitors and a plurality of capacitor positions. The ADC generates a random...
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7504978 |
Digital-analog converter capable of easily extending resolution
There is provided a digital-analog converter capable of easily extending the resolution that can easily extend the resolution by a simple circuit implementation when a 10-bit digital-analog...
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7504972 |
Method for increasing the resolution of analog to digital conversion
A method for increasing the resolution of analog to digital conversion made by a microcontroller. A resistive-capacitive network is connected between an input/output port of the microcontroller and...
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7498963 |
Method for generating a modulator input signal and premodulator
A method for generating at least one modulator input signal from at least one regulator signal is provided. The method comprising: generating at least one dither signal based on the periodic output...
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7486213 |
Method and system for increasing resolution and accuracy of an analog to digital converter
According to one embodiment, a method for increasing resolution and accuracy of an analog to digital converter receiving an input voltage includes dithering a number of digital output values from...
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7479909 |
Suppression of even-numbered harmonic distortion in a non-linear element
In a method for suppression of even-numbered harmonic distortion which occurs in a non-linear element 4, a signal x(n) is linked to a pseudo random noise sequence r(n), and is thus spread, before...
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7471223 |
Delta-sigma modulator circuits in which DITHER is added to the quantization levels of methods of operating the same
A delta-sigma modulator circuit includes an n-level quantizer circuit that is configured to generate a quantized output signal responsive to an input signal. The n-level quantizer circuit includes...
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7456766 |
Sigma-delta modulation with offset
Techniques for performing ΣΔ modulation with offset in order to reduce out-of-band quantization noise are described. In an exemplary oversampling DAC that implements ΣΔ modulation with offset,...
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7446691 |
Methods and apparatus for multiplexed signal sources using an analog-to-digital converter
A multiplexing circuit uses parallel-configured pairs of resistors and signal sources in a voltage divider network in such a way that a single analog-to-digital input can be used to specify the...
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7443328 |
Apparatus and method of using spread pulse modulation to increase the control resolution of an electronic device
An apparatus and method are described to increase the control resolution of an electronic device. In one embodiment, the invention includes a spread pulse modulation module to generate a first set...
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7443324 |
Apparatus and method for dithering a sigma-delta modulator
A signal processor includes a sigma-delta modulator. The input signal to the signal-delta modulator may contain a dc component that generates spurious tones in the modulator output. An input signal...
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7425911 |
Signal-to-noise ratio when using fewer bits than the number of output bits of an analog to digital converter
Improving signal-to-noise ratio (SNR) when using fewer bits than the number of output bits of an ADC as digital representation of the strength of the samples of an input signal. In an embodiment,...
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7411534 |
Analog-to-digital converter (ADC) having integrator dither injection and quantizer output compensation
An analog-to-digital converter (ADC) having integrator dither injection and quantizer output compensation reduces the probability of unchanging code sequences that occur when the input signal and...
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7408489 |
Method and system for mixed analog-digital automatic gain control
Aspects of the invention provide a method and system for a mixed analog-digital automatic gain control. The received analog signal is amplified by the analog amplifier and then converted to a...
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7394418 |
Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator
A method of generating a quantized signal in a Sigma-Delta modulator ( 25 ) comprises the steps of feeding a modulator input signal to a quantizer ( 15 ) via at least one integrator ( 12, 13 );...
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7385537 |
Linear feedback shift register first-order noise generator
A first-order signal generator ( 135 ). The generator comprises a shift register ( 210 ′) having a number N of bit positions. Each bit position is operable to store a binary value, the shift...
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7382296 |
System for mixed analog-digital automatic gain control
Aspects of the invention provide a system for a mixed analog-digital automatic gain control. The received analog signal is amplified by the analog amplifier and then converted to a digital value by...
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7362250 |
Dynamic dither for sigma-delta converters
A sigma-delta converter having dynamic dithering that reduces or removes idle-channel tones and increase linearity of the converter. The dither is differentiated in multiple orders before being...
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7348906 |
INL curve correction in a pipeline ADC
The present invention relates to a method and system for reducing integral non linearity errors in a pipeline Analog to Digital Converter (ADC). The invention provides in a first embodiment a...
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7324028 |
Self-calibrating continuous-time delta-sigma modulator
A self-calibrating continuous-time delta-sigma modulator determines whether time constants of its internal integrators are too large or too small by injecting a calibrating sequence into the...
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7317411 |
Delta-sigma modulator having quantizer code pattern detection controlled dither
A delta-sigma having quantizer code pattern detection controlled dither reduces the probability of “stuck” code sequences that occur when the input signal and feedback signal are equal and thus...
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7317410 |
System and method for spectral shaping of dither signals
A digital modulator includes a quantizer and a mapper. The quantizer converts a dithered signal value to a voltage. The mapper provides a modulated signal based on the voltage received from the...
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7307563 |
Apparatus and method for performing dithering in communication system using orthogonal frequency division multiplexing scheme
Disclosed are an apparatus and a method for performing dithering in a communication system using an orthogonal frequency division multiplexing scheme. A method for adding dithering noise in a...
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7301489 |
Dithering noise cancellation for a delta-sigma modulator
In an embodiment, a delta-sigma modulator is constructed from one or more stages of a first order low-pass filter, which has a modest gain compared to the integrator used in other embodiments of...
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7301488 |
Digital PWM controller for preventing limit cycle oscillations
An apparatus and method for minimizing limit cycle oscillations within a switched power supply includes providing a programmable dither signal as an input to the digital control loop connected...
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7277033 |
System and method for subtracting dither reference during analog-to-digital conversion
A system and method directed to using a dither signal during conversion of an analog input signal to a digital output signal without summing the dither signal to the analog input signal. Such...
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7277032 |
Low-pass filter based delta-sigma modulator
In an embodiment, a delta-sigma modulator is constructed from one or more stages of a first order low-pass filter, which has a modest gain compared to the integrator used in other embodiments of...
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7248195 |
Methods and apparatus for multiplexed digital inputs using an analog-to-digital converter
A multiplexing circuit uses parallel-configured switch/resistor pairs in a voltage divider network in such a way that a single analog-to-digital input can be used to specify the state of more than...
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7224305 |
Analog-to-digital modulation
A supplied analog signal is modulated by comparing the supplied analog signal with a noise signal. As a result of each comparison, an output signal is generated having a first value if the supplied...
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7224299 |
System and method for adjusting dither in a delta sigma modulator
A delta sigma modulator is provided. The delta sigma modulator comprises quantitizer circuitry configured to generate a digital signal using a first analog signal and dither control circuitry...
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7221724 |
Precision timing generation
A precision timing generator and an associate method provide a precise clock signal based on a reference clock signal. Using the reference clock signal in a phase locked loop or delay locked loop,...
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7221302 |
Delta-sigma modulator coefficient calibration method and apparatus
A delta-sigma modulator coefficient calibration method and apparatus provides for adjustment of the modulator coefficients, and thus the modulator noise transfer function (NTF), in operational...
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7221301 |
Method and system for mitigating background noise for a Sigma-Delta digital-to-analog converter
A sigma delta digital-to-analog (D/A) converter system ( 10 ) includes a summing device ( 35 ) at an input of a D/A converter ( 30 ), and a low frequency low amplitude wave signal ( 31 ) injected...
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7221299 |
Method and apparatus for an ADC circuit with wider input signal swing
An analog-to-digital converter (ADC) system that converts an analog input signal into a digital output circuit uses a method of shaping a pseudo-random signal such that the ADC system can be used...
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7215267 |
Analog-to-digital converter with dither control
An analog-to-digital converter system comprises an analog-to-digital converter and a dither generator. The analog-to-digital converter receives an analog input signal and generates a digital signal...
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7176821 |
Reduced area digital sigma-delta modulator
A digital sigma-delta modulator requiring minimal die area and dissipating minimal power is formed with a plurality of integration stages coupled in tandem between an input node and an output node....
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7164979 |
Data transmission system and occupant protection device
A G sensor 31 generates a measuring value by measuring an impact acceleration applied to a vehicle. An A/D converter 32 converts the measuring value into a digital value with a resolution of K...
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7107175 |
Continuous digital background calibration in pipelined ADC architecture
Disclosed are new methods and systems for achieving calibration in a pipelined ADC system. The methods and systems may be used to provide continuous digital background calibration in a pipelined...
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7106232 |
Analog multiplexer and variable gain amplifier for intermediate frequency applications
A diversity receiver circuit system ( 10 ) including a primary channel ( 20 ) and a diversity channel ( 22 ), where analog input signals are converted to differential signals in both channels ( 20,...
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7098824 |
Apparatus and method for dithering image signals in combination with offset
An apparatus and method for masking interference noise contained in a signal source. According to the present invention, the apparatus comprises: a pseudo random binary sequence generator for...
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7088779 |
Method and apparatus for reducing the word length of a digital input signal and method and apparatus for recovering a digital input signal
A method and signal processing apparatus for reducing the number of bits of a digital input signal (M i ), includes adding a pseudo-random noise signal (N a ) to the digital input signal (M i ) to...
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7075466 |
System and method for improving performance of an analog to digital converter
The present invention provides an ADC apparatus and method for improving effective bit resolution and suppressing digital reconstruction artifacts with an anti-aliasing filter and an over-sampled...
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7071860 |
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...
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