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7613538 |
Compensation for distortion in contact lithography
A method of contact lithography includes predicting distortions likely to occur in transferring a pattern from a mold to a substrate during a contact lithography process; and modifying the mold to...
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7519489 |
Determination of a jitter property of a signal
Determining a jitter property of a signal with a repetitive bit sequence of a plurality of bits includes setting a sample point at a first sampling position relative to a first transition within...
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7443173 |
Systems and techniques for radio frequency noise cancellation
Various embodiments for radio frequency (RF) noise cancellation are described. In one embodiment, an apparatus may comprise an RF noise cancellation system arranged to sense platform noise observed...
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7405574 |
Signal detector
A signal suppression filter ( 22 ) that inhibits high-frequency signals contained in power voltage and a signal separation filter ( 23 ) that prevents transmission of the high-frequency signals are...
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7386070 |
Hardware assisted adjacent channel leakage ratio measurement
A tester module is used to perform an adjacent channel leakage ratio measurement. The tester module includes a translation block, a first filter, a re-sampler, a memory, a router, a second filter...
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RE40322 |
Tests for non-linear distortion using digital signal processing
A system for determining a composite signal level at which a signal path begins to generate non-linear distortion . A uses a reference test signal , which is preferably a short-duration burst...
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7333051 |
Methods and devices for determining the linearity of signals
A method (for example, machine-implemented, e.g., via a receiver), for determining whether a transmitted pulsed-signal is a linear or non-linear frequency modulated (FM) signal, includes:...
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7265557 |
Method and circuit for measuring characteristic parameters of intermodulation distortion
An arrangement is for measuring characteristic parameters of intermodulation distortion of a device under test. The arrangement may include a generator of at least two tones at different test...
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7259569 |
Calibration circuit and method thereof
A calibration circuit and method thereof. In the example method, a common-mode voltage may be detected at an output port of a mixer. At least one common-mode feedback voltage may be generated...
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7218122 |
Power disturbance generator
An apparatus selectively generates a disturbance in a three-phase supply voltage provided to a load. The apparatus includes input connections for receiving a first phase voltage, a second phase...
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7208955 |
Power relay or switch contact tester
Embodiments of the invention include a test circuit having an auxiliary low power test signal generator, filters, and a detector to test a power switch. The generator sends an auxiliary low power...
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7200825 |
Methodology of quantification of transmission probability for minority carrier collection in a semiconductor chip
A method for computer aided design of semiconductor chips which minimizes sensitivity to latchup is provided. The method evaluates electron transmission, reflection and absorption at geometric...
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7151379 |
Techniques to test transmitted signal integrity
Briefly, a system that may facilitate system and line loop back diagnostic operations. In one possible implementation, a first transceiver may transmit test signals to a second transceiver. The...
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7116114 |
Power supply noise measuring device
According to one embodiment, a signal from a power supply line is caused to pass through a high pass filter, and a first signal is generated by adding a voltage-divided signal to the signal. In...
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6950764 |
Arrangements to detect and respond to disturbances in electrical power systems
A control arrangement and method is provided for detecting and responding to disturbances in electrical power systems. In a preferred arrangement, an integration is initiated that is based on a...
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6898535 |
Method and apparatus for decomposing signal jitter using multiple acquisitions
A method and apparatus for analyzing jitter in a signal. The signal is buffered to form a sequence of signal vectors and a time interval error function is calculated for each the signal vector. A...
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6882947 |
Discrete fourier transform (DFT) leakage removal
A technique for measuring spectral components, such as noise and distortion, of a non-coherently sampled test signal containing at least one tone of known frequency includes modeling the spectral...
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6861846 |
Distortion measurements with a vector network analyzer
A distortion measurement method uses alternative measurements to determine the distortion of a DUT, depending on the ratio of the distortion at an output of the DUT to distortion of a source...
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6795496 |
Jitter measuring device and method
A signal under measurement is transformed into a complex analytic signal using a Hilbert transformer and an instantaneous phase of this analytic signal is estimated. A linear phase is subtracted...
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6640193 |
Method and system for measuring jitter
According to one embodiment of the present invention, a system ( 100 ) for measuring overall jitter is disclosed that includes a data converter ( 102 ) that measures a signal to generate a first...
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6622117 |
EM algorithm for convolutive independent component analysis (CICA)
In connection with blind source separation, proposed herein, inter alia, are: expectation-maximization equations to iteratively estimate unmixing filters and source density parameters in the...
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6566891 |
Measurement system and method of determining characteristics associated with a waveform having distortion associated therewith
The present invention provides a measurement system and a method of determining characteristics associated with a waveform that compensate for distortion associated therewith. In one embodiment,...
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6545487 |
System and method for producing an amplified signal with reduced distortion
A distortion reduction system uses upstream signal information from carrier frequencies in a signal to be amplified, to determine at least one frequency for the distortion generated by an amplifier...
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6518741 |
Modulation analyzing apparatus with balance/imbalance converter
An inversion in-phase component and a non-inversion in-phase component of a modulation signal inputted from a quadrature modulation section of a sample machine captured in a pair of signal lines,...
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6344749 |
Test system for measuring frequency response and dynamic range on cable plant
A test system for measuring a frequency response of a signal path 148 by transmitting a short duration burst test signal 234 from a remote point 152 , capturing an impaired burst test signal ...
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6208945 |
Harmonic component measuring method for power system
Frequencies fx between the measurement harmonic (mth-degree harmonic) and the (m±1)th-degree harmonics are determined from an expression of fx=(fs*m)±{(fs/n)*k)} where n and k are each an...
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6140822 |
System for signal path characterization with a reference signal using stepped-frequency increments
A system that utilizes a reference signal for testing signal paths for complex frequency response (linear distortion), and non-linear distortion. This reference signal, which is also known as a...
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6014027 |
Current and voltage probe for measuring harmonic distortion
A non-contact probe provides information as to relative amplitudes of harmonics of a current or voltage waveform as well as total harmonic distortion. The probe includes a non-contact sensor with...
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5974361 |
Waveform reconstruction from distorted (saturated) currents
A method employed in a condition monitoring unit (CMU) for monitoring a circuit breaker or interrupter to obtain a substantially undistorted version of a waveform suffering from saturation...
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5818240 |
Method and system for measuring signal transfer characteristics in the presence of WOW, flutter and intermodulation distortion
A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a...
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5789927 |
Baseband measurement of RF power amplifier distortion
An RF power amplifier distortion measurement system measures amplitude and phase distortion of a microwave/RF power amplifier by phase quadrature down-conversion of each of an RF amplifier's input...
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5789928 |
Circuit and method for discriminating the source of waveform distortion in an electric power generation and distribution system
A circuit to discriminate the source of harmonic distortion of the output voltage comprises voltage sensors coupled to the output terminals of a source of electric power and to a point of...
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5748001 |
Method and apparatus for fast response and distortion measurement
A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a...
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5698985 |
Cross-talk measurement instrument with source indication as a function of distance
A pulse-based LAN cable test instrument that processes time-domain cross-talk measurement information in order to troubleshoot and quickly locate sources of cross-talk as a function of distance...
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5644495 |
Method and apparatus for wow and flutter analysis
Wow and flutter of a tape player is measured by playing a recording of a constant frequency test tone, digitally sampling and storing each period of the tone over a test interval, subtracting the...
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5629703 |
Method for reducing harmonic distortion in an analog-to-digital converter system
A spectrum analyzer (10, 70) employs a method of reducing the amplitude of harmonic and spurious signals (102, 104, 112) introduced into a frequency-domain output spectrum by, for example,...
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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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5570029 |
Cable crosstalk measurement system
A cable crosstalk measurement system provides fault diagnostic information to locates faults in addition to providing a crosstalk versus frequency function to test and troubleshoot LAN cables. In a...
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5559440 |
Method and apparatus for testing telecommunications equipment having both analog and digital interfaces
A line interface circuit (12 1 ) having a digital interface (18) and an analog interface (20) coupled to the digital interface by a transmission path (23, 26) may be tested by launching a digital...
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5465050 |
Dynamic range tester
A dynamic range tester which simultaneously generates two signals, each of hich is composed of a clean signal plus an excess quantity of independent and isolated random noise is disclosed for use...
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5394120 |
Device for testing an amplifier
A device for testing an amplifier. A plurality of PN modulators are provided corresponding to a plurality of oscillators at stages preceding or following them, or fluctuation is given to division...
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5250907 |
Digital signal measurement apparatus
In this digital signal measurement apparatus, an approach is employed to deliver a measurement signal from a measurement signal generator to a measured circuit to transform the signal on the time...
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5113139 |
Low-distortion waveform generating method and waveform generator using the same
Waveform data read out of a memory is converted by a D/A converter into an analog waveform, and amplified by an amplifier to generate a waveform signal. To cancel a distortion generated in the...
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5089782 |
Vector network analyzer for swept frequency harmonic and mixer conversion loss measurements using either an internal or external signal source
A vector network analyzer for performing swept frequency measurements on non-linear RF devices, using either an internal or external signal source. This simplifies and speeds linear and non-linear...
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5072187 |
Method and apparatus for determining the total harmonic distortion and power factor of a non-linear load circuit
A method and apparatus for determining the total harmonic distortion and the power factor of a non-linear load circuit coupled to an a.c. power source generating a.c. current and a.c. voltage, the...
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4977376 |
Method for disturbance reduction in measurement systems for analysis of emission or transmission processes
For the reduction of noise signals, and particularly crosstalk signals, in measurement systems for analyzing emission or transmission processes and composed of a serial arrangement of a signal...
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4937520 |
Instrument to measure the errors of apparent power meters
An instrument to determine, under actual field conditions, which type of VA demand meters are most appropriate for a particular consumer. The type of electrical load that the consumer places on an...
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4792751 |
Apparatus for field testing the performance of a feedforward amplifier
An apparatus for field testing a feedforward amplifier includes a source of an RF signal and a source of an audio frequency signal. Both of these signals are applied to the feedforward amplifier...
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4344028 |
Testing device for low-frequency amplifiers
Disclosed is a testing device for low-frequency amplifiers, comprising two sets of circuits connected to the output of the amplifier being tested. The first set of circuits is intended for...
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