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6501401 Means for compensating a data-dependent supply current in an electronic circuit  
Electronic circuitry comprising a data processing circuit for processing a digital signal (DS), such as a digital to analog converter (DAC), and a current compensation circuit (CMP). Both the...
6501400 Correction of operational amplifier gain error in pipelined analog to digital converters  
A pipeline analog to digital converter that includes a main pipeline including a plurality of analog to digital converter stages and a shadow pipeline for compensating the output of the main...
6498998 Method and apparatus for testing a semiconductor device  
Method and apparatus for testing a semiconductor device having an A-D converting unit, capable of generating a highly accurate test waveform of high speed. The semiconductor testing apparatus...
6498572 Method and apparatus for delta modulator and sigma delta modulator  
According to the invention, oscillating signals are generated from analog signals by providing an analog signal having a variable slope or amplitude to a circuit with a variable operating point and...
6496124 System and method for compensating for codec DC offset through a DC blocking channel and modem incorporating the same  
A system for, and method of, compensating for codec DC offset and a modem incorporating the system or the method. In one embodiment, the system includes: (1) a DC offset compensator that develops...
6492929 Analogue to digital converter and method of analogue to digital conversion with non-uniform sampling  
An analogue to digital converter generating at least two threshold levels and a comparator for comparing each of the levels with the input signal and generating a primary digital output signal to...
6492924 Circuits, systems, and methods for signal processors that buffer a signal dependent current  
A signal processor circuit that buffers a ground-referred, signal-dependent, current. A ground-referred node in the circuit is preferably maintained at a ground level. The ground-referred,...
6492923 Test system and testing method using memory tester  
A memory tester including an algorithmic pattern generator (ALPG) for generating a test pattern as a digital signal based on vector data is provided with a digital-to-analog converter built in the...
6492922 Anti-aliasing filter with automatic cutoff frequency adaptation  
An anti-aliasing filter with adaptable cutoff frequency. In various embodiments, the filter includes a calibrator/adaptor section and an anti-aliasing filter section. Both sections include a...
6492798 Method and circuit for testing high frequency mixed signal circuits with low frequency signals  
A method of testing an analog, or mixed analog and digital, circuit designed for operation at a clock frequency multiplexes a plurality of low frequency stimulus signals using a high frequency...
6489914 RSD analog to digital converter  
A RSD analog to digital converter has an RSD stage that in turn has a switched capacitor integrator (SCI). The SCI uses an operational amplifier. A capacitor, which operates as a offset...
6489912 Analog-to-digital converter for monitoring VDDQ and dynamically updating programmable Vref when using high-frequency receiver and driver circuits for commercial memory  
A memory subsystem package has a memory controller interface ASIC (application specific integrated circuit) and a plurality of memory modules. The ASIC has a bi-directional serial protocol i2C...
6489908 Wireless local loop terminal and system having high speed, high resolution, digital-to-analog converter with off-line sigma-delta conversion and storage  
A wireless local loop apparatus and corresponding system having an improved DAC operable at higher speed than heretofore achievable which exploits the sigma-delta principle in a different way. More...
6489905 Segmented DAC calibration circuitry and methodology  
A segmented digital-to-analog converter (DAC) has been described that uses a two-step calibration process to calibrate current sources to a single primary reference source. In one embodiment, the...
6489904 Pipeline analog-to-digital converter with on-chip digital calibration  
A multi-stage pipeline analog-to-digital converter employs an internal digital domain error detection and calibration algorithm to eliminate accumulated digital truncation errors to thereby improve...
6486807 A/D converter calibration  
A pipeline stage in a multi-bit/stage pipeline A/D converter is calibrated by switching a set of D/A converter unit-segments in the stage to predetermined states to produce a first digital signal....
6486806 Systems and methods for adaptive auto-calibration of Radix<2 A/D SAR converters with internally generated stimuli  
An auto-calibrating companion bit successive approximation system uses sampling and balancing capacitors in a charge redistribution digital-to-analog converter having multi-valued capacitors of...
6486805 Frequency to digital converter  
According to an embodiment of the present invention, an input signal is provided to an oscillator, which creates a count signal with a greater frequency than the input signal. The input signal...
6483449 Digital-analog converter comprising a third order sigma delta modulator  
A digital-analog converter having a sigma delta cascade modulator with two outputs, particularly a third order sigma delta modulator 2+1. The digital-analog converter includes a sigma delta...
6480137 Method of generating matched capacitor arrays  
An algorithmic procedure automatically generates layout of matched capacitor arrays used in A/D converters, D/A converters and programmable gain amplifiers, among other types of devices, using...
6480127 Input sub-ranging converter system for sampling semiconductor temperature sensors  
A converter system for a temperature sensor includes a programmable current source, a digital-to-analog converter, a summer, and an analog-to-digital converter. The temperature sensor provides a...
6476932 Digital resolution translator  
A method and system for digital resolution translation. An input frequency is received, as is a desired output frequency. The desired output frequency is measured directly and compared with the...
6476751 Low voltage analog-to-digital converters with internal reference voltage and offset  
An A-to-D converter system having programmed reference signal levels using only supply signal provided by a power supply is disclosed. The converter system includes a comparator configured to...
6476742 Evaluation system for analog-digital or digital-analog converter  
There is provided an evaluation system for an A-D converter or a D-A converter capable of evaluating factors of a compounded fault and measuring an effective number of bits with a high accuracy and...
6476741 Method and system for making optimal estimates of linearity metrics of analog-to-digital converters  
A method and system for making optimal estimates of linearity metrics of analog-to-digital converters. A model building phase and a production test strategy are employed. During the model-building...
6473015 Current-steering D/A conversion with current source mismatch compensation  
The present invention refers to a method for using a current-steering N-bit D/A converter and to the D/A converter, said converter comprising N binary weighted current sources SI k , k=0, 1, . . ....
6473013 Parallel processing analog and digital converter  
In one aspect, the present invention is directed to a converter for converting a signal from a first format to a second format. The converter includes a decomposition section, a converter array...
6473012 A/D converter background calibration  
A background calibrated A/D converter includes a random time interval generator that initiates background calibration at randomly selected time instants to increase the spurious-free dynamic range...
6469650 Method and system for selecting implementation of a filter controller between a single conversion mode that ensures a fully-settled converted output and a continuous conversion mode  
A method and system for selecting implementation of a filter controller between a single conversion that ensures a fully-settled converted output and a continuous conversion of an input signal are...
6466153 Highspeed, high spurious-free dynamic range pipelined analog to digital converter  
A method for shuffling capacitors, for application in a stage of a pipelined analog-to-digital converter that samples an input voltage at each of a sequence of sample times and provides a sequence...
6463093 METHOD AND APPARATUS TO REDUCE SPURIOUS AND INTERMODULATION PRODUCTS IN WIRELESS BROADBAND MULTI-CARRIER DIGITAL TRANSCEIVER EQUIPMENT THROUGH STATIC NON-LINEARITY CORRECTION OF DIGITAL CONVERSION COMPONENTS  
Apparatus and method to perform the real-time correction of differential non-linearities in a broadband wireless transceiver system using a digital look-up table. Initially, the values for the...
6462684 Advanced self-calibrating, self-repairing data acquisition system  
An improved self-calibrating and self-repairing Data Acquisition System (DAS) for use in inaccessible areas, such as onboard spacecraft, and capable of autonomously performing required system...
6462683 Circuit configuration and method for setting the switching points of a decision maker  
A circuit configuration for calibrating the switching points of a decision module that is controlled by an analog input signal, in dependence on a direct component contained in the input signal in...
6459394 Multi-bank flash ADC array with uninterrupted operation during offset calibration and auto-zero  
A system and method is disclosed for calibrating comparators of an ADC while the ADC continues to operate in an uninterrupted fashion. Groups (banks) of interleaved comparators may be calibrated at...
6456212 Using single lookup table to correct differential non-linearity errors in an array of A/D converters  
Generation of a single look-up table for performing DNL correction on an array of analog-to-digital converters (ADCs) is disclosed. Initially, the analog input voltages to the array of ADCs are...
6456211 Method and system for calibrating a data converter  
A system ( 100 ) for calibrating data converters ( 101 ) includes a data converter ( 101 ) that receives an input signal and generates one or more pre-digital error correction codes from the input...
6452522 Delta Modulator  
An adaptive delta modulator has an A/D-converter controlled by a digital control signal, which is also supplied to a drift compensation logic circuit, which generates a drift compensated digital...
6452519 Analog to digital converter utilizing a highly stable resistor string  
A successive approximation ADC is provided. Contacts to a resistor string may be placed outside of the current path of the resistor string to provide a highly stable resistor string having a very...
6452518 A-D converting apparatus, and calibration unit and method therefor  
Analog-to-digital (A-D) converting apparatus ( 100, 120, 130 ) for calibrating a time error includes: an analog signal input portion ( 10 ); a plurality of analog-to-digital converters ( 12 ); a...
6449569 Calibration and compensation of delta sigma ADC's and DAC's by correlating noise signals  
The present invention correlates noise from a delta sigma modulator with noise from the same modulator passed through a nonlinear block whose purpose is to isolate the imperfection being measured....
6448919 ADC sharing for keypad and tough panel of a phone  
A keypad that produces a voltage level indicative of a key pressed and a touch panel that produces a voltage level indicative of a location on the touch panel that has been pressed are both coupled...
6448918 Digital/analog converter  
It is object to provide a digital-to-analog converter capable of generating an output waveform having less distortion without increasing the operating speed of components. A D/A converter comprises...
6448911 Circuits and methods for linearizing capacitor calibration and systems using the same  
A switched capacitor circuit includes a plurality of capacitor arrays coupled to a node, including an input array, a trim array associated with a selected capacitor of the input array and an offset...
6445330 Capacitively coupled references for isolated analog-to-digital converter systems  
The present invention provides an alternative to Prior Art isolation techniques by providing a capacitively coupled reference voltage and a capacitively coupled gain calibration. The isolation...
6445329 High speed analog to digital converter  
An analog to digital converter having a group of subrange analysis blocks and reference voltage and offset voltage selection blocks. Each subrange analyses block produces an output representative...
6445324 Method for dynamic matching of the elements of an integrated multibit digital-to-analog converter with balanced output for audio applications  
A method for digital-to-analog conversion of a digital input code into a first output analog signal and a second output analog signal to be supplied to a first terminal and a second terminal,...
6445317 Adaptively calibrating analog-to-digital conversion  
A method, arrangement, and system enable adaptive calibration of an analog-to-digital converter (ADC) from reference signals with unknown parameter(s) that may vary (e.g., a varying frequency). An...
6445316 Universal impedance control for wide range loaded signals  
In one embodiment of the present invention, a compensation driving circuit includes a code generator, an enable circuit, and a driver. The code generator generates a driver code from a compensation...
6445315 Calibration of isolated analog-to-digital converters  
Measurement data collected by isolated ADCs in multiple channels may be related. In such a scenario, data may be transmitted to a microcontroller or programmable logic device for centralized...
6442213 Digital isolation system with hybrid circuit in ADC calibration loop  
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...
Matches 451 - 500 out of 958 < 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 >