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| Number | Title | Issue Date |
| 7436165 | Device for measuring very short current pulses An apparatus adapted to measure of current pulses that are very brief (a few nanoseconds) and of very low amplitude (a few microamps), such as those that can emanate from a photodetector used for the optical transmission of data at very high speed, or from a photode... | 10/14/2008 |
| 7222035 | Method and apparatus for determining changing signal frequency A method and apparatus for estimating the changing frequency of a signal received by a satellite receiver from, illustratively, positioning system satellites is disclosed that enables a more accurate measurement of the change in frequency of that signal due to movem... | 05/22/2007 |
| 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 functional test unit for testing a digital function of a device under test (... | 02/06/2007 |
| 6998850 | Systems and methods for measuring picoampere current levels In one embodiment, a circuit measures picoampere current levels. The circuit comprises: an operational-amplifier that has differential inputs and differential outputs; a switching structure that switchably couples an input line to one of the differential inputs in r... | 02/14/2006 |
| 6762601 | Non-invasive detectors for wells Detector circuitry for detecting magnetic field disturbances resulting from the movement of equipment through a pipe of magnetic material, the detector circuitry comprising a difference circuit fed with the outputs of two longitudinally spaced sensor means via respe... | 07/13/2004 |
| 6717393 | System for difference calculation using a quad slope converter A system for measuring signals in a non-linear network is provided which reduces the reliance on hardware and processing support when correcting for A/D offset by performing a pair of dual slope measurement cycles with an integrating analog to digital converter (ADC... | 04/06/2004 |
| 6690152 | Acceleration of automatic test Integrated circuitry including a clock circuit powered by a first power supply and a secondary circuit powered by a second power supply. The secondary circuit includes a control signal output for supplying a control signal to the clock circuit and a clock... | 02/10/2004 |
| 6681190 | Method and system of harmonic regulation A system and method of harmonic regulation includes a harmonic regulator configured to cancel or inject harmonics into a power conversion system. A resettable integrator is provided to determine at least one harmonic coefficient of the at least one error ... | 01/20/2004 |
| 6664777 | Photometric apparatus and photometric method Photometric apparatus and photometric method measure a wide range of incident light amounts accurately and efficiently. The photometric apparatus includes an optical sensor for delivering a photocurrent; an integrator capacitor for integrating the photocu... | 12/16/2003 |
| 6624623 | Method and apparatus for digitally measuring the frequency of a signal by integration of its signal phase In a method and apparatus for measuring the frequency of a signal by integration of its signal phase, a phase accumulator integrates the signal phase of the signal, at predetermined time intervals. A first intermediate memory reads in a first output value... | 09/23/2003 |
| 6604056 | Method and system of harmonic regulation A system and method of harmonic regulation includes a harmonic regulator configured to cancel or inject harmonics into a power conversion system. A resettable integrator is provided to determine at least one harmonic coefficient of the at least one error ... | 08/05/2003 |
| 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 connected to the first signal processing module. The devic... | 08/20/2002 |
| 6356085 | Method and apparatus for converting capacitance to voltage An apparatus for converting capacitance in a capacitive sensor into a voltage signal. A capacitive sensor monitors a physical parameter. A capacitance of the sensor varies with the physical parameter. A voltage supply applies an alternating voltage to the... | 03/12/2002 |
| 6300776 | Method and device for discrete-time reactance measurement For discrete-time reactance measurement the reactance is activated by a clocked generator device with an electric voltage, an electric current or an electric charge. A clocked analyzer device generates an output signal as a function of the reactance to be... | 10/09/2001 |
| 6300766 | Apparatus sensitive to arc amplitude for envelope detection of low current arcs An arcing fault detector band pass filters the ac current in a protected circuit to generate a sensed current signal with pulses having an amplitude related to the step increases in current produced each time an arc is struck. The envelope of this pulse s... | 10/09/2001 |
| 6265860 | Waveform measuring apparatus and waveform obtaining method Disclosed is a waveform measuring apparatus in which an integration period T can be discretionally set to a value in accordance with the analog voltage cycle of the device being measured with a simple circuit configuration. The waveform measuring apparatu... | 07/24/2001 |
| 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 fixed sampling intervals, monitors the actual period of the w... | 10/27/1998 |
| 5726901 | System for reporting computer energy consumption A circuit for determining and reporting the energy consumed by an electronic device having a microprocessor and power supply lines for supplying power to the device is disclosed. The circuit comprises a voltage divider connected for sensing the voltage ac... | 03/10/1998 |
| 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 |
| 4853639 | Non-contacting voltage metering apparatus A non-contacting voltage metering device for monitoring the electrical potential of a test surface includes a sensing integrator, and a tuning fork mechanism for modulating the capacitive coupling. The integrator input is coupled to the amplifier output a... | 08/01/1989 |
| 4807147 | Sampling wave-form digitizer for dynamic testing of high speed data conversion components A sampling digitizer system which may be expanded for the dynamic testing of high speed data conversion components is provided. The sampling waveform digitizer system comprises a sampling comparator for comparing a sampled input signal with a first signal... | 02/21/1989 |
| 4774682 | Nonlinear statistical signal processor A signal processor is for receiving an input signal y. The input signal y has in it a signal x and has a conditional density function, given that the signal x is present, p(y|x). The signal processor includes a memory for storing the amplitude-density-fun... | 09/27/1988 |
| 4587482 | Digital frequency meter for measuring radiation The present invention relates to a digital frequency meter for measuring radiation comprising a first up/down counter which algebrically integrates frequency differences between pulses to-be-measured and feedback pulses derived from a clock generator, a s... | 05/06/1986 |
| 4563637 | System for measuring amplitude of noise-contaminated periodic signal In order to measure the amplitude of a periodic signal of known frequency which may be heavily contaminated by noise and whose phase is not known at the point of measurement, e.g. at an output end of an optical fiber, two samples are periodically taken in... | 01/07/1986 |
| 4504786 | Signal detector The specification discloses a circuit and method for detecting the presence and phase of a particular frequency in an input signal. The input signal is applied to the inputs of two linear multipliers and the other inputs of the multipliers are the inphase... | 03/12/1985 |
| 4422037 | Storm warning method and apparatus An apparatus and method of detecting, tracking and displaying lightning activity is disclosed. A lightning stroke has associated therewith electric and magnetic field components characterized by maximum rise times and minimum power levels. The field signa... | 12/20/1983 |
| 4408284 | Signal processing system A signal processing system and technique is disclosed for detecting the pence of a desired frequency signal particularly that of a sine wave, in a noisy environment. The signal mixed with noise is received and analyzed by a Fast Fourier Transform spectru... | 10/04/1983 |
| 4344031 | Method and device for verifying signals, especially speech signals The characteristic values are obtained from the signal to be verified, e.g. in the case of a voice signal the total energy in the individual frequency spectrum ranges, and these characteristic values are quantified. The frequency with which the individual... | 08/10/1982 |
| 4322806 | Frequency response analyzer A frequency response analyzer having means for producing a phase modulated test signal for input into the system under test; means for dividing the output signal from the system under test into two channels. Means for multiplying the test signal of each c... | 03/30/1982 |
| 4284351 | Processing of digital signals A method of, and apparatus for, processing a digital electric signal composed of a train of discrete uniformly or non-uniformly shaped pulses to recover spectral information contained in the spacings between the pulses, in which the digital signal is appl... | 08/18/1981 |
| 4238727 | Digitally programmable apparatus for generating a substantially linear ramp signal A digitally programmable ramp generator produces a substantially linear ramp along with an equivalent digital code by use of a multiplying digital to analog converter which drives an integrator which produces a ramp voltage. This ramp voltage is compared ... | 12/09/1980 |
| 4160922 | Method of generating a direct current control signal from a noisy alternating current signal A DC signal is generated having a amplitude related to the amplitude of an AC signal, with minimal delay and low sensitivity to noise in the AC signal.... | 07/10/1979 |
| 4156183 | Method of and means for measuring the level of test signals over selected wide band frequency ranges To measure the level of test signals over a frequency range of variable bandwidth B, bounded by a lower frequency f' and an upper frequency f", these signals are heterodyned with a variable modulating frequency to produce a frequency spectrum encompassing... | 05/22/1979 |
| 4103230 | Apparatus for analyzing electrical signals of variable amplitude An electrical signal analyzing circuit for manually controlling the durational sequencing of an integrator circuit for providing visual readout of test signal divergence and maximum peak voltage levels. The integrator circuit is first time delay activatab... | 07/25/1978 |
| 4074190 | Signal measuring apparatus Apparatus for measuring the time integral of a signal between pairs of time points comprises a ramp voltage generator and a plurality of pairs of potentiometers. A comparator circuit is associated with each potentiometer to provide a switching signal at t... | 02/14/1978 |
| 3940692 | Apparatus for monitoring recurrent waveforms A method and apparatus for monitoring recurrent waveforms such as electrocardiogram (e.c.g.) waveforms. The e.c.g. apparatus comprises integrators and stores for storing integrated segments of a normal, reference waveform complex. A timing circuit derives... | 02/24/1976 |
