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| Number | Title | Issue Date |
| 8174418 | Inexpensively improving resolution and reducing noise of low-noise signals Systems and methods for improving resolution of low-noise signals in an analog-to-digital conversion circuit. A simple, low cost pseudo-noise generating circuit is disclosed that, when connected to the signal conditioning circuitry of A/D conversion circuit, adds ps... | 05/08/2012 |
| 8085176 | Method and apparatus for dithering in multi-bit sigma-delta digital-to-analog converters A multi-bit (M-bit, M>1) Sigma-Delta digital-to-analog converter (DAC) with a variable resolution multi-bit quantizer that has its digital value inputs that are truncated or rounded to a resolution that follows a random or pseudo-random sequence to provide automatic... | 12/27/2011 |
| 8068045 | Calibration methods and structures for pipelined converter systems Calibration methods and structures are provided for pipelined analog-to-digital converter systems. They are arranged to process samples of the digital codes with an algorithm that is preferably configured to repeatedly update an estimate of the transfer function wit... | 11/29/2011 |
| 8004436 | Dithering technique for reducing digital interference The invention is directed to a circuit and method for equalizing digital interference. A digital interference equalizing circuit may include a signal clipping unit, receiving a digital signal and clipping the digital signal based upon a clipping function, and a dith... | 08/23/2011 |
| 7982643 | System and method for reducing pattern noise in analog system processing An analog-to-digital conversion system includes an analog-to-digital converter (ADC), a plurality of receivers, each for capturing input analog signals, a multiplexer having inputs coupled to each of the receivers and an output coupled to the ADC, the multiplexer es... | 07/19/2011 |
| 7961125 | Method and apparatus for dithering in multi-bit sigma-delta digital-to-analog converters A multi-bit (M-bit, M>1) Sigma-Delta digital-to-analog converter (DAC) with a variable resolution multi-bit quantizer that has its digital value inputs that are truncated or rounded to a resolution that follows a random or pseudo-random sequence to provide automatic... | 06/14/2011 |
| 7961126 | Method and apparatus for dithering in multi-bit sigma-delta analog-to-digital converters A multi-bit (M-bit, M>1) or multi-level (nlev levels, nlev>2, encoded on M bits where M=Floor(log 2(nlev))) sigma-delta analog-to-digital converter (ADC) with a variable resolution multi-bit quantizer having its resolution (number of distinct output levels) and asso... | 06/14/2011 |
| 7956778 | Analog-to-digital converter There is provided an analog-to-digital converter capable of performing analog-to-digital conversion with good accuracy. The analog-to-digital converter in accordance with the present invention includes a dither generation circuit 11 which generates dither; an... | 06/07/2011 |
| 7920082 | D/A converter circuit and digital input class-D amplifier The present invention provides a D/A converter circuit which enables D/A conversion with a high precision and can prevent occurrence of a limit cycle component in the case where an input signal is low, and can also prevent the effect of dither signal from occurring ... | 04/05/2011 |
| 7876247 | Signal dependent dither A new technique on the dithering of one-dimensional signals is presented. The novel technique determines whether dither is needed when reducing the bit depth and evaluates whether the total error of the un-dithered quantization is white noise. If this is the case, t... | 01/25/2011 |
| 7868798 | Methods and apparatus for whitening quantization noise in a delta-sigma modulator using dither signal Methods and apparatus are provided for whitening quantization noise in a delta-sigma modulator using a dither signal. An input signal is quantized using a predictive delta-sigma modulator by quantizing the input signal using a quantizer; adding a dither signal at a ... | 01/11/2011 |
| 7859440 | Increased resolution 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 the analog to digital converter to generate a number of dithered value... | 12/28/2010 |
| 7847714 | ΔΣ-type A/D converter There is provided a technique for reducing the adverse effect of idle tones in the channels in a ΔΣ-type A/D converter including a plurality of channels for converting analog input signals into digital signals. The ΔΣ-type A/D converter includes an L channel for... | 12/07/2010 |
| 7830287 | Analog to digital converter having digital correction logic that utilizes a dither signal to correct a digital code An analog to digital converter is provided. The converter comprises a dither gain generator, a first stage, an adder, a second stage, and a digital error correction logic. The dither gain generator generates a dither gain. The first stage receives a first voltage to... | 11/09/2010 |
| 7825839 | Measuring device and measuring method for measuring the power of a high-frequency signal A measuring device for measuring the power of a high-frequency signal including a detector for detecting the high-frequency signal and for generating an analog detector signal, an analog/digital converter for generating a digital signal and an evaluation device for ... | 11/02/2010 |
| 7800522 | A/D converter and method for enhancing resolution of digital signal A method for enhancing resolution of digital signals converted from analog signals is provided. An analog input signal is converted into N-bit digital outputs, where N is a positive integer. The N-bit digital outputs are interpolated to add one or more least signifi... | 09/21/2010 |
| 7786910 | Correlation-based background calibration of pipelined converters with reduced power penalty A device and method for correlation-based background calibration of pipelined converters with a reduced power penalty. A pipelined analog-to-digital converter (ADC) utilizes a random or pseudorandom signal to reduce the quantization error of subconverting stages. St... | 08/31/2010 |
| 7764208 | Clock dithering process for reducing electromagnetic interference in D/A converters and apparatus for carrying out such process A process and apparatus for generating an output signal whose frequency varies according to a modulation scheme, the process including the steps of providing a dither generator for receiving a first input signal representative of a clock frequency and for generating... | 07/27/2010 |
| 7719452 | Pipelined converter systems with enhanced linearity Signal converter system embodiments are provided to substantially reduce symmetrical and asymmetrical conversion errors. Signal-processing stages of these embodiments may include a signal sampler in addition to successively-arranged signal converters. In system embo... | 05/18/2010 |
| 7696910 | Dither circuit and analog digital converter having dither circuit According to one aspect of the present invention, there is provided a dither circuit including a dither generating circuit generating a plurality of complementary signal pairs, and a dither input circuit generating a plurality of dither signals from the plurality of... | 04/13/2010 |
| 7663518 | Dither technique for improving dynamic non-linearity in an analog to digital converter, and an analog to digital converter having improved dynamic non-linearity An analog to digital converter comprising a conversion engine having redundancy therein; and a dither device for applying a dither to the conversion engine; and a controller adapted to operate the conversion engine to perform a successive approximation conversion of... | 02/16/2010 |
| 7649481 | Blue-noise-modulated sigma-delta analog-to-digital converter A sigma-delta ADC (200A) uses blue-noise (random, pseudo-random) modulation (202) to reduce the effect of the substrate noise. Pairs of blue-noise multipliers (202) are placed before and after each non-delayed integrator (106). In the cas... | 01/19/2010 |
| 7633417 | Device and method for enhancing the human perceptual quality of a multimedia signal A device is described herein that performs a digital-to-analog conversion on a digital multimedia signal in a manner that enhances the human perceptual quality of the resulting analog multimedia signal (e.g., musical passage). In one embodiment, the device operates ... | 12/15/2009 |
| 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 with the dither value to obtain a sampling signal; converting the sampl... | 10/13/2009 |
| 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 converter, and supplies the altered spectrum noise signal to the associated... | 07/14/2009 |
| 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 sequence associated with a desired analog waveform and a pseudo-random n... | 06/30/2009 |
| 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. ... | 06/16/2009 |
| 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 randomized by flipping the input signal and output signal randomly.... | 05/26/2009 |
| 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 number for a conversion cycle. The ADC configures each capacitor of the... | 05/19/2009 |
| 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 a sense voltage to be converted. The sense voltage is measured (i.e.... | 03/17/2009 |
| 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 of elements of a discrete dither sequence of the basic form DF=0, 1,... | 03/03/2009 |
| 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 the analog to digital converter to generate a number of dithered value... | 02/03/2009 |
| 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 passing through the non-linear element 4. After passing ... | 01/20/2009 |
| 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 n adder circuits that are configured to add a dither signal to n quan... | 12/30/2008 |
| 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, an interpolation filter performs upsampling and interpolation filteri... | 11/25/2008 |
| 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 of bits based on a second set of bits that is larger than the first s... | 10/28/2008 |
| 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 to the signal processor is multiplied by an output of a waveform gen... | 10/28/2008 |
| 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, an ADC generates digital values of H bits by sampling an input signal ... | 09/16/2008 |
| 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 feedback signal are equal and thus no quantizer output change occurs. ... | 08/12/2008 |
| 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 digital value by an ADC. A clamp reference level of the converted signal i... | 08/05/2008 |
