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| Number | Title | Issue Date |
| 7598723 | Method and apparatus for detecting resonance in electrostatically driven elements A method and system is disclosed that can be used to directly detect and analyze an electric signal electrostatically induced a semi-conductive or conductive element at resonance. Through detection of the changes in the characteristics of the signal from the element... | 10/06/2009 |
| 7355378 | Source synchronous sampling There is provided a method of source synchronous sampling, where a first clock signal of a first unit is synchronized to a second signal received from a second unit. The method includes determining a timing control signal on the base of the first clock signal and th... | 04/08/2008 |
| 7339985 | Zero crossing method of symbol rate and timing estimation System and method for analyzing communication signals. A digital signal comprising multiple samples is received, representing a plurality of binary symbols. Zero crossings of the signal are determined, each comprising a respective first sample immediately preceding ... | 03/04/2008 |
| 7292170 | System and method for improved time-interleaved analog-to-digital converter arrays System and method for improved time-interleaved analog-to-digital converter arrays which reduces sampling mismatch distortion found in prior art arrays. There may be two causes of non-uniform sampling mismatch in a TI-ADC array, a mismatch due to skew and a mismatch... | 11/06/2007 |
| 7190937 | Method for determining the frequency of a radio signal and monitoring communications with a radio receiver A method and apparatus provide for monitoring radio frequency signals and, in conjunction with the monitoring, determining frequency of a received dominant radio frequency signal. Zero amplitude transitions of the signal are counted in primary and secondary sampling... | 03/13/2007 |
| 7138933 | Time-interleaved signal converter systems with reduced timing skews Time-interleaved signal converter systems are provided that multiplex respective digital sequences of system converters into an interleaved digital sequence before filtering each respective digital sequence with digital filters that apply respective filter coefficie... | 11/21/2006 |
| 7132766 | Method and apparatus for providing a switching signal in the presence of noise A technique for controlling a switching circuit, such as a relay, includes one or more sensing circuits that generate signals based upon the presence of an actuating object and upon a randomly applied strobe signal. The generated signals are sampled and are used as ... | 11/07/2006 |
| 7088275 | Variable clock rate analog-to-digital converter An algorithmic analog-to-digital converter (ADC) includes a sample-and-hold circuit and an ADC processing unit operating in parallel and sharing a single operational amplifier. The ADC processing unit includes an MDAC with a switched capacitor topology and a sub-ADC... | 08/08/2006 |
| 7068202 | Architecture for an algorithmic analog-to-digital converter An algorithmic analog-to-digital converter (ADC) includes a sample-and-hold circuit and an ADC processing unit operating in parallel and sharing a single operational amplifier. The ADC processing unit includes an MDAC with a switched capacitor topology and a sub-ADC... | 06/27/2006 |
| 7058377 | Dual channel downconverter for pulsed radio frequency measurements A dual channel downconverter that includes a two-channel heterodyne receiver architecture for downconverting two frequency-agile, pulsed RF signals to identical fixed IF signals without the use of a tunable local oscillator. This accomplishes downconversion while pr... | 06/06/2006 |
| 7046964 | Method and apparatus for determining the frequency of a radio signal during periods of stability and monitoring communications with a radio receiver A method and apparatus provide for monitoring radio frequency signals and, in conjunction with the monitoring, determining frequency of a received dominant radio frequency signal. Zero amplitude transitions of the signal are counted in primary and secondary sampling... | 05/16/2006 |
| 7043383 | Frequency error detection apparatus and method based on histogram information on input signals A frequency error detection apparatus and method based on histogram information of an input signal. The apparatus includes an A/D converter for and converting an analog signal into digital values; a zero crossing point detector for detecting sign changes of the digi... | 05/09/2006 |
| 7026804 | Sample and hold circuit A method and system for sampling an analog signal that minimizes perturbations caused by noise. In one embodiment, the sample and hold circuit includes a plurality of switches in series between the sampled source and a hold capacitor. A resistor is located in parall... | 04/11/2006 |
| 7006797 | Coherence frequency determining system and associated radio apparatus The invention provides an apparatus and a method for determining the frequency of a radio frequency signal. The coherency of a received signal is determined and only the frequency of a coherent signal is determined. Zero amplitude transitions of coherent signals are... | 02/28/2006 |
| 6922066 | Sampler and method of measuring a waveform of a current with jitters reduced In a sampler for use in measuring a waveform of an electric signal, a measurement target current is given as the electric signal to a sampler chip 11 and is also used to produce a trigger current Itr for determining measurement timing on the sampler chip. A c... | 07/26/2005 |
| 6839657 | Method of and an arrangement for characterizing non-linear behavior of RF and microwave devices in a near matched environment A method of and an arrangement for characterizing non-linear behavior of RF and microwave devices under test in a near matched environment. The method comprises the steps of exciting the device by an RF signal under different load conditions, measuring signal data a... | 01/04/2005 |
| 6545454 | System and method for testing an integrated circuit device using FFT analysis based on a non-iterative FFT coherency analysis algorithm A system tests analog and mixed signal IC devices using an FFT algorithm, supported by a non-iterative Fast Fourier Transform (FFT) coherency analysis algorithm to establish FFT sample-set coherency. A test signal is input into the IC device, and an outpu... | 04/08/2003 |
| 6541952 | On-line cancellation of sampling mismatch in interleaved sample-and-hold circuits The present invention relates to a high speed sample and hold circuit having a plurality of sample and hold subcircuits coupled in parallel between an input and an output. The circuit also having a calibration sample and hold subcircuit coupled to the plu... | 04/01/2003 |
| 6483287 | Waveform measuring apparatus A frequency synthesized signal generator outputs a frequency synthesized signal having a frequency equal to a repetition frequency of a signal under test by employing a reference signal. A phase comparator detects a phase difference between a phase of the... | 11/19/2002 |
| 6344735 | Spectrum analyzer and spectrum measuring method using the same A power spectrum waveform is obtained by logarithmically amplifying a signal received by a frequency-sweep operation, detecting the amplified output of each frequency sweep, converting the detected output into a digital signal value in decibels, and conve... | 02/05/2002 |
| 6329806 | Process for determining the harmonic oscillations of the fundamental component of an electrical signal The present invention relates to a process for determining harmonic oscillations of a fundamental component of an electrical signal, wherein the signal is sampled with a sampling frequency corresponding to a multiple of the fundamental component's frequen... | 12/11/2001 |
| 6246223 | Method for use on a parametric tester to measure the output frequency of a ring oscillator through voltage sampling A method is provided for use on a parametric tester that allows the parametric tester to more effectively and precisely measure the output frequency of a periodic pulse signal generating means. The first step is to down convert the output frequency of the... | 06/12/2001 |
| 5932998 | System for determining fundamental frequency of an AC signal A system for determining the fundamental frequency of a digitized AC signal is disclosed. Each signal zero crossing is detected, and in response to each zero crossing, two discrete impulses are generated. In response to the train of generated impulses, th... | 08/03/1999 |
| 5889398 | Process for determining the harmonic oscillations of the fundamental component of an electrical signal The present invention relates to a process for determining harmonic oscillations of a fundamental component of an electrical signal, wherein the signal is sampled with a sampling frequency corresponding to a multiple of the fundamental component's frequen... | 03/30/1999 |
| 5834930 | Device for sensing the period of a digitized signal including noise evaluation and averaging over a plurality of zero crossing A real time sensor for signal periods includes a zero crossing sensor for sensing a period of a signal and a noise evaluation circuit. If the noise of the signal is smaller than a predetermined value, the output of the zero crossing sensor is averaged ove... | 11/10/1998 |
| 5714876 | In-service serial digital source signal-level and cable-length measurement An in-service cable length and source signal level measurement system uses a simple, zero-IF superheterodyne receiver tuned to only two reference frequencies to generate samples of a serial digital signal at each of the two frequencies. The samples at the... | 02/03/1998 |
| 5631553 | High precision RF vector analysis system based on synchronous sampling The signals to be measured are transformed in the system to discrete time digital signals by synchronous sampling. These digital signals are then processed by a digital signal processor for vector detection and for computing digital feedback sent to the s... | 05/20/1997 |
| 5602709 | High impedance fault detector A method and apparatus for detecting high impedance faults and other arcing phenomena in an electrical distribution system. Electrical signals on the distribution system are monitored and a number of frequency components isolated, such as zero-sequence cu... | 02/11/1997 |
| 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 first clock circuit. A sampling circuit samples the repet... | 12/31/1996 |
| 5545976 | Gated spectrum analyzer A narrowband spectrum analyzer separates and analyzes a chosen segment of a periodic signal. The signal to be analyzed is digitized by an A/D converter. A gate generator is configured to trigger on a particular portion of the signal waveform and to identi... | 08/13/1996 |
| 5508605 | Method for measuring RF pulse frequency A method for measuring the frequency of a stream of RF pulses using multi-purpose, commercial-off-the-shelf test devices, such as an RF signal down converter, a digitizer and a signal processor. The method is based on digital signal processing and determi... | 04/16/1996 |
| 5373236 | Highly accurate zero crossings for frequency determination The technique to measure the frequency very accurately for electronic warfare (EW) applications, and is simple in hardware, and which can accomplish this goal with a signal with real data (in contrast to complex data). It uses trigonometric identities to ... | 12/13/1994 |
| 5359533 | Method for determining a frequency/time profile of hits, and device for carrying out the method In a method for determining a frequency/time profile of hit sequences and the corresponding device, a measuring window is opened after an external starting signal has been locked. As long as the measuring window is open, the clock periods are counted. If ... | 10/25/1994 |
| 5323104 | Method and arrangement for demodulating a frequency modulated signal The invention relates to a method and to an arrangement for demodulating a signal (f) preferably frequency modulated with digital information, and then particularly a frequency shift modulated signal, with a frequency counter detector (16) which directly ... | 06/21/1994 |
| 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 for producing sample signals at a constant rate; and a me... | 11/16/1993 |
| 5198750 | Extremely wide range frequency measurement method This invention discloses a digital frequency measurement system, providing high accuracy and a fast dynamic response over an extremely wide frequency range. This measurement system provides for double buffering of pulse count and pulse period, so that dat... | 03/30/1993 |
| 5019823 | Frequency measurement An apparatus for measuring the frequency of an input signal is described. The apparatus uses a quadrature sampling system to obtain values of the instantaneous phase of the signals at a succession of time intervals, the values being converted into cumulat... | 05/28/1991 |
| 4928251 | Method and apparatus for waveform reconstruction for sampled data system Representations of signal edges of a repetitive signal are sampled without triggering, then sorted out based on frequency and sequence and then superimposed along a common time base of one period in order to reconstruct a signal. In a specific embodiment ... | 05/22/1990 |
| 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 connected to (a) an unknown repetitive waveform having a kn... | 08/29/1989 |
| 4789950 | Pre-interpolation adaptive filter An adaptive filtering procedure reduces overshoot which may be present on a waveform having infinite slopes displayed on a digital oscilloscope as a result of interpolation between samples at the location of the infinite slopes. An adaptive filtering proc... | 12/06/1988 |
