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7532869 |
Automatic power level control circuit for a transceiver device
An automatic power level control circuit provides output power control of a transmitter device as used in wireless LAN applications in that an output signal is detected and a corresponding control...
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7423564 |
Optical signal processing device for A/D converter including optical encoders with nonlinear loop mirrors
An optically sampling device optically samples an optical analog signal using a sampled signal having a predetermined sampling frequency, and outputs control light having a pulse train of an...
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7348908 |
Linearity corrector using filter products
A linearity corrector is provided that reduces distortion in a signal processing system, such as an ADC. The linearity corrector provides a first order signal path having distortion components...
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7312736 |
Trading off visibility for volume of data when profiling memory events
When tracing memory events the required bandwidth may be reduced by forming a logical OR of several memory event signals to determine the location of memory events. A second trace run may be made...
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7212592 |
Digitally programmable gain control circuit
A digitally programmable gain control circuit and method of operating the same is disclosed. The gain control circuit includes a programmable gain amplifier having an amplifier structure...
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6901108 |
Apparatus and method for adaptive control
An adaptive controller generates a sequence of dither signals for each of a plurality of control parameters. Each dither signal sequence is uncorrelated with every other dither signal sequence....
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6897842 |
Nonlinearly mapping video date to pixel intensity while compensating for non-uniformities and degradations in a display
Timing information may be embedded along with other display control information in a signal using a pulse width modulation (PWM) mechanism to controllably drive a display (e.g., a plurality of...
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6778126 |
Structures and methods that improve the linearity of analog-to-digital converters with introduced nonlinearities
Analog-to-digital converter (ADC) structures and methods are provided that reduce an initial converter nonlinearity by introducing an inverse nonlinearity into the converter's response that is...
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6525683 |
Nonlinearly converting a signal to compensate for non-uniformities and degradations in a display
A digital signal directed to a display (e.g., a plurality of display elements forming an array of display elements) may be converted into an analog signal using a nonlinear relationship. In one...
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6507347 |
Selected data compression for digital pictorial information
This invention provides a method and apparatus to selectively compress digital image data for the supply of that information to digital display screens or storage. The invention utilizes a digital...
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6489911 |
Direct digital waveform synthesizer with DAC error correction
A direct digital waveform synthesiser with DAC error correction includes a digital to analog converter system for producing a desired output waveform and having between its digital and analog...
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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...
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6448754 |
BIST method for testing cut-off frequency of low-pass filters
A method and circuitry for implementing a built-in self test (BIST) for determining the frequency characteristics of filter circuits in mixed-signal integrated circuits (ICs). The method comprises...
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6373471 |
Keyboard with interchangeable connection function
A keyboard with interchangeable connection specification, comprises an input/output circuit board for DIN, PS/2 or USB connection specification and replaceably assembled within a main body of the...
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6337643 |
Method and device for generating a random signal and digital-to-analog converting systems using same
A process and device for generation of a random signal, and a digital-analog conversion system using such a random signal. The process includes a first noise generation step, a second noise...
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6043768 |
Device and method for switching between different operating modes of a transducer
A device and method for data transmission between a transducer and a processing unit which are coupled by one or several signal transmission lines, to selectively activate at least two different...
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5822225 |
Self-calibrating data processors and methods for calibrating same
Highly accurate, self-calibrating data processors and methods for calibrating the same use internal analog references with negligible time and temperature drifts. A first input reference signal set...
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5751235 |
System and method for enhancing joystick performance
A joystick system is designed to provide a modified digital representation of the setting of a joystick potentiometer. The system operates to compensate for non-linearities and offsets in the...
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5638073 |
Method of linearizing variations in the transfer characteristic of a D/A converter, as well as an arrangement and use thereof
A method is provided for linearizing variations in a transfer characteristic of a digital-to-analog (D/A) converter to which a digitized input signal is fed for being converted to an analog output...
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5594612 |
Analog-to-digital converter with digital linearity correction
A analog calibration signal including at least one frequency component is generated by a very pure signal source, such as a digital oscillator and a digital-to-analog converter (DAC) that has been...
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5594439 |
Diagnosing problems in an electrical system by monitoring changes in nonlinear characteristics
Abnormal changes in the non-linear characteristics of electronic components are an indication of abnormal conditions such as impending component or system failure. To detect such abnormal changes...
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5196851 |
Linearizing non-linear analog-to-digital process and circuit
A circuit for linearizing analog-to-digital output is shown in FIG. 2, with an analog signal V i transmitted by input circuit 10 is applied to an input port of an analog-to-digital converter 12...
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5121120 |
Programmable digital measuring and control instrument for a vacuum gauge
A digital and programmable measuring and control instrument comprising a digital-analog converter receiving an analog signal from a pressure transducer and converting it into a digital signal and...
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5113188 |
Analog-to-digital converter utilizing devices with current versus voltage characteristics with a plurality of peaks and negative resistance regions between peaks
An analog-to-digital converter circuit is disclosed for receiving an analog input signal and producing a digital output having a plurality of binary bits representative of the input signal. A...
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5061927 |
Floating point analog to digital converter
A floating point analog to digital converter having an exponent converter which divides the input signal successively one-half until the divided signal is within the range of a mantissa linear...
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5047769 |
Methods of correcting data conversion/transfer errors in a vibratory energy imaging system utilizing a plurality of channels
A method for correcting data conversion/transfer errors in each of a plurality N of channels of a vibratory energy imaging system, by: providing an addressable memory having a plurality L=2 M ...
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5047771 |
Apparatus for implementation of desired input/output function in an electronic system having a plurality of channels
Apparatus for providing a desired output signal as a function of a single-valued input signal in an electronic system, includes: an addressable memory, having a plurality L locations, each for...
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5043730 |
Digital-analog conversion circuit with application of voltage biasing for distortion stabilization
A digital-analog converter circuit comprising a current output type digital-analog converter and a current/voltage converter connected to an output terminal of the current output type...
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5023490 |
Analog signal compression circuit
A desired non-linear, monotonic compression function is performed substantially symmetrically upon both polarities of an AC signal by a circuit having a plurality of limiting stages, each having...
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4994803 |
Random number dither circuit for digital-to-analog output signal linearity
Distortion in a digital-to-analog converter (DAC) is eliminated by adding a digital random number to each sample of the digital signal, converting the sum into analog form, and subtracting from...
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4933675 |
Audio digital/analog encoding and decoding
Apparatus and an associated method are described for encoding an analog signal to a digital representation thereof and then decoding the same to reconstruct the original analog signal with reduced...
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4914440 |
Adjustable current source and digital/analog converter with autocalibration using such a source
An adjustable current source comprising a bipolar transistor (BT), the base of which receives a signal adapted to approximately set the current which flows therethrough, and a MOS transistor (MT),...
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4804941 |
Circuit for compensating a linearity of an input/output characteristic of a parallel comparison type analog-to-digital converter
An improved circuit for compensating an input/output characteristic linearity of a parallel comparison type analog-to-digital converter which reduces a wasteful consumption of current in the...
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4800574 |
Digital modulator/demodulator including non-linear analog-to-digital converter and circuitry compensating for the non-linearity of the converter
A low cost analog-to-digital converter having a non-linear conversion characteristic produces an output digital signal non-linearly relative to an input analog transmission signal which is applied...
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4794794 |
Thermal anemometer
A thermal anemometer, including a constant temperature anemometer bridge excitation circuit together with multiple signal comparators and a tapped resistance reference divider, providing a...
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4768208 |
Mid-symbol sampling timing estimator
A timing error estimator which samples a received stream of data symbols at the beginning, end, and a mid-point of a symbol period is disclosed. These samples are used with a model that assumes...
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4764751 |
Method of nonlinear A/D conversion
A non-linear analog-to-digital converter in which an output of a non-linear analog-to-digital conversion circuit is applied to a look-up table memory. The contents of the look-up table are adjusted...
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4716398 |
Linearity control circuit for digital to analog converter
In a circuit utilizing a digital to analog converter, an amplifier receives two voltage levels of a digitally modulated input signal via two different switching circuits. Linearity of output...
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4270177 |
Digital amplitude control for digital audio signal
A digital amplitude control apparatus for a digital audio signal in which the output voltage of a linear-type potentiometer or attenuator connected across a DC power supply is converted into a...
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4217574 |
Analog to digital converter having nonlinear amplitude transformation
An analog to digital converter simultaneously digitizes a gamma corrected analog video signal and removes the gamma correction. The converter has a plurality of parallel analog comparators which...
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4110746 |
A-D converter having nonlinear characteristics
Disclosed is an A-D converter in which a voltage to be measured is subjected to first integration for a certain period of time; a reference voltage of the opposite polarity from the voltage to be...
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4064396 |
Dynamic linearization system for a radiation gauge
The disclosed linearization system and process converts a high resolution non-linear analog input signal, representative of the thickness of an object, into a high resolution linear analog output...
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4064423 |
Digital system and method for generating analog control signals
Digital system and method for generating analog control signals wherein a plurality of straight line segments are fitted to the desired wave form, and signals representative of the changes in...
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4045658 |
Digitized linearizing correction apparatus with frequency modulation
A digitized linearizing correction apparatus has an input from a nonlinear responding thermocouple which produces a signal proportional to a temperature to be measured. An oscillator generates...
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4031530 |
Digital second-order clock linearizer
In order to obtain a very close fit to the characteristic curve of a non-linear sensor, such as a thermocouple, a linearized clock is developed and used to increment a counter during a time period...
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4023159 |
Non-linear analogue-digital converter
A non-linear analogue-to-digital converter having analogue-to-digital conversion relation curves on the basis of which the conversion is carried out and which curves can be freely exchanged. The...
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3979745 |
System and method for linearizing analog measurements during analog-to-digital conversion
An instrument for linearizing a non-linear analog output produced from a sensor such as a thermocouple to obtain a true measurement of the parameter or engineering units of interests. The full...
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3975727 |
Automated calibration and standardization apparatus
New and improved apparatus is provided for the calibration and standardization of the analog output signal level of automated analysis equipment, which level varies as a function of the...
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3953718 |
Digital calculating apparatus
Digital calculating apparatus, which is particularly suitable for linearizing a digitized output signal produced by a non-linear transducer such as a thermocouple, comprises a store connected in a...
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3939459 |
Digital signal linearizer
A digital signal linearizer for obtaining a linear digital output from a non-linear input. The output voltage of a thermocouple is converted to a train of pulses by a dual slope analog to digital...
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