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7355537 Built-in self-test apparatus and method for digital-to-analog converter  
A built-in self-test apparatus for a digital-to-analog converter uses a differentiation unit for differentiating a digital-to-analog (DA) signal to obtain the differences between pulses of the...
7298151 Methods and apparatus for reducing thermal noise  
Methods and apparatus for reducing the thermal noise integrated on a storage element are disclosed. One embodiment of the invention is directed to a sampling circuit comprising a sampling capacitor...
7298128 Method of detecting RF powder delivered to a load and complex impedance of the load  
Methods and systems of detecting one or more characteristics of a load are disclosed. One or more characteristics of a first signal may be detected at the output of a Radio Frequency (RF) power...
7292021 Anomaly detector for vibratory angular rate sensor  
In an anomaly detector that detects an abnormal condition of an oscillation signal of a circuit such as a vibratory sensing circuit, the oscillation signal, having AC and DC components, is...
7265694 System and method for successive approximation  
A system and method for providing successive approximation, such as can be used by a successive approximation converter or by a coherent undersampling digitizer. The system comprising a memory...
7246017 Waveform measuring apparatus for measuring waveform data and writing measurement data to acquisition memory  
A waveform measuring apparatus can sequentially and continuously read measurement data from an acquisition memory, where the measurement data has been written by multiple acquisitions, after...
7214868 Acoustic signal processing apparatus and method, signal recording apparatus and method and program  
A highlight portion is detected to a high accuracy from acoustic signals in say an event, and an index is added to the highlight portion. In an acoustic signal processing apparatus 10 , a...
7194365 Method and apparatus for integrated undersampling  
An undersampling system can comprise an IC that has integrated, on the same physically contiguous IC, both an undersampler circuit and a receiver circuit whose input is to be monitored by...
7173443 Semiconductor test system  
A mixed signal test system for testing a semiconductor device having both an analog function and a digital function achieves improved resolution and low cost. The test system is formed of a...
7119530 Motor phase current measurement using a single DC bus shunt sensor  
A method and system for obtaining motor current measurements from a DC bus current of an inverter that drives a pulse width modulated electric machine is disclosed. The method may include sensing a...
6998834 Real-time time drift adjustment for a TDR step stimulus  
A method for reducing drift in a step stimulus from a sampling system, such as an oscilloscope, is described having an initial step of setting a calibration repetition rate. A step stimulus...
6968277 Power line monitoring and interrupt method and apparatus  
In order to detect high-speed transients in the alternating current of a power distribution system, the rate at which the power on the distribution system is sampled is increased so that even...
6965238 Methods and apparatus for analyzing high voltage circuit breakers  
Methods, computer program segment and apparatus for analyzing high voltage circuit breakers are provided. The method includes determining a circuit breaker contact closing time, determining a...
6856924 Mixer-based timebase for sampling multiple input signal references asynchronous to each other  
Sampling is performed. A strobe signal is generated from a first signal. Multiple sampled signals are sampled using the strobe signal. Each of the multiple sampled signals is synchronous with its...
6798185 Method and apparatus for testing analog to digital converters  
A method and apparatus for testing ADC circuitry. The method and apparatus detects infrequently occurring errors by providing a series of waveforms to the ADC that have different amplitude,...
6751566 Sampling digitizer, method for sampling digitizing, and semiconductor integrated circuit test device with sampling digitizer  
A sampling digitizer comprises a sampling head 11, a clock generator 12, a digitizer 13 and a trigger circuit 14. A clock signal from the clock generator is also supplied to a delay element...
6703820 Method and circuit for testing high frequency mixed signal circuits with low frequency signals  
A sampling circuit for use in testing an analog waveform includes a sampling switch for sampling an analog waveform, a sample storage capacitance including a single capacitance and a plurality of...
6680606 Electrical sampler for non-simultaneous sampling  
An electrical sampler device has a plurality of samplers for sampling an electrical signal. Each of the samplers is responsive to a corresponding sampling point. The electrical sampler device also...
6662124 Protective relay with synchronized phasor measurement capability for use in electric power systems  
The relay system obtains voltage and current values from a power line and uses a first sampling element to sample the voltage and current values at selected intervals of time. The resulting sampled...
6650101 Timebase for sampling an input signal having a synchronous trigger  
A timebase establishes the timing of samples acquired by a signal sampler relative to a trigger signal that is synchronous with an input signal applied to the signal sampler. The synchronous...
6614214 Sampling element controlled by photoconductive switch-generated sampling pulses and sampling device incorporating same  
The sampling element comprises a DC sampling voltage source, a threshold sampling circuit and a photoconductive switching element. The threshold sampling circuit includes a signal-under-test input,...
6552524 High speed power system high voltage transient damage assessment  
A method for detecting, in real time, high energy transients in an electrical power system, the method including obtaining real time data defining a power waveform, converting the data to digital...
6509728 Spectrum analyzer having function of displaying amplitude probability distribution effectively  
A spectrum analyzer including a signal receiving and processing unit, a sampling unit, a histogram measuring unit, an arithmetic unit and a display unit. The signal receiving and processing unit...
6437952 Earth protection device sensitive to arc currents, trip device and circuit breaker comprising such a device  
An earth protection device having an input for receiving a first signal representative of an earth fault current, a first signal processing module, and a module for processing protection functions...
6407686 Waveform measuring apparatus  
A reference signal generation portion generates a reference signal independently of a repetition cycle of a signal under test. A frequency measuring portion measures a repetition frequency of the...
5900755 Phase dither of an acquisition clock using a phase lock loop  
The phase of an acquisition clock for a digital oscilloscope is modulated by summing an offset voltage with the output of the phase detector of a phase lock loop. The offset voltage is generated by...
5890097 Apparatus for waveform disturbance monitoring for an electric power system  
A monitor/analyzer for an alternating current (AC) electrical system responds to power line disturbances by generating a trigger signal when a change in voltage with respect to time electrical...
5828983 Method and apparatus for processing a sampled waveform  
A method and apparatus are provided for approximation of integral and RMS values for waveforms of uncertain or unknown period. The technique employed processes values of the waveform sampled at...
5764044 Process for producing time dependent waveforms of positive and negative symmetrical sequence components of a power system's voltages or currents  
A numerical comparator employs numerical techniques based upon the behavior of the cylinder unit to compare phasors in real time. In one application, the torque signal generated by the numerical...
5748303 Light sensing device  
A light sensing device including at least one light sensor is provided. The at least one light sensor is configured to be exposed to a light image. In response to the light image, the at least one...
5706204 Apparatus for triggering alarms and waveform capture in an electric power system  
A monitor/analyzer for an ac electrical system can be programmed through a display on the front panel to respond to selected events by generating triggers signals when selected monitored electrical...
5706203 Waveform measuring apparatus for easily providing pretrigger function by using FIFO memory  
A waveform measuring apparatus having a dummy readout circuit which applies first read signals of a same period as sampling signals to a read clock terminal of a FIFO memory during an interval...
5698984 Adaptive digital filter for improved measurement accuracy in an electronic instrument  
An adaptive digital filter is provided to obtain improved measurement accuracy in an electronic instrument which has a front-end circuit for coupling to an input signal to be measured. An analog to...
5589763 Coherent undersampling digitizer for use with automatic field test equipment  
An apparatus measures a repetitive signal in a coherent manner, including a signal generating circuit to output the repetitive signal in accordance with first clock signals which are generated by a...
5578917 Repetitive digital sampling circuit using two delay lines for improved time accuracy  
A digital sampling circuit is providing for repetitively launching a series of stimulus pulses into a network under test and digitally sampling the resulting response signal. Enhanced time base...
5576618 Process and apparatus for comparing in real time phase differences between phasors  
A numerical comparator is disclosed. The numerical comparator employs numerical techniques based upon the behavior of the cylinder unit to compare phasors in real time. In one application of this...
5491722 Eye pattern margin measurement and receiver stress detection device  
A system and method are provided wherein binary communications signals are received, and sequences of values of like types of these, such as positive ones, positive zeroes, negative ones, and...
5319569 Block averaging of time varying signal attribute measurements  
A method and apparatus for block averaging measurement data from dynamic, repeating input signals, for example, frequency modulated signals, take into account the time variability of the...
5262714 Sinewave frequency measuring apparatus  
This invention relates to sinewave frequency measuring apparatus and method and more particularly such apparatus including a frequency estimator triggered by a zero crossing of a sinewave and means...
5253273 ISDN "S" signal detection and display apparatus  
A ISDN "S" signal detection and display apparatus including a clock signal generator for synchronizing to the "S signal" and for developing a frame sync clock, a signal converter for connection...
5025207 Method for the measurement of a steady level in a noise-infested signal and automatic measuring device for the application of this method  
The disclosure concerns automatic measuring stands. The automatic measurement of the amplitude of an intermodulation line at the output of a TV transmitter is difficult to achieve because this line...
4950999 Self-contained, real-time spectrum analyzer  
A self-contained, real-time spectrum analyzer performs the function of spectrum analysis on one or more analog electrical signals. The analyzer consists of an oversampling analog-to-digital...
4918381 Automated method for determining total harmonic distortion  
The accuracy of an automated THD measurement performed by an FFT signal analyzer is improved by refining the estimate of the signal's fundamental frequency on which the THD analysis is based. This...
4904930 Method of carrier frequency estimation  
A method is provided for searching a wide, high-noise frequency band for a narrow, phase-modulated signal to determine the approximate carrier frequency of a data signal. The method comprises the...
4890055 Compensated chirp fourier transformer  
A method and circuit for compensating a chirp Fourier transformer wherein alignment tones of known frequency are provided in the input signal, and the transforms of the alignment tones in the...
4864522 Process for the sampling of an electric signal varying over time and apparatus for the implementation and application of this process  
In a process for the sampling of an electric signal changing over time, an electron beam (12) is deflected laterally and linearly over time and at the same time modulated in its intensity according...
4862073 Repetitive wave sampler  
A repetitive wave sample suited to monolithic integrated circuit fabrication, comprising a comparator followed by a master/slave latch feeding into an integrator. The inputs of the comparator are...
4860227 Circuit for measuring characteristics of a device under test  
A measurement circuit includes two signal sources, one for generating a test input signal to a DUT and the other for generating a sampling signal. Both sources are coupled to one crystal oscillator...
4858142 Digitizer effective resolution measurement system using sinewave parameter estimation  
A method and apparatus for determining the effective bits of resolution of a digitizer wherein amplitude, frequency, phase angle and offset parameters characterizing a sinewave input signal to the...
4818931 Vector analyzer with display markers and linear transform capability  
A vector analyzer incorporates a set of five types of markers for the display, which facilitate the visual analysis of the magnitude, phase and time relationships of the I and Q components of the...
Matches 1 - 50 out of 181 1 2 3 4 >