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| Number | Title | Issue Date |
| 7271579 | AC signal level detection circuit An AC voltage generated by an AC power source 1 is rectified by a full-wave rectifying circuit 2, which generates a rectified voltage. An internal regulator 33 performs waveform shaping of the rectified voltage. A comparator 42 compares t... | 09/18/2007 |
| 7253737 | Automated antenna trim for transmitting and receiving semiconductor devices A radio frequency communication device and methods of testing and tuning an antenna attached thereto are disclosed. A radio frequency communication device comprises internal circuitry and an antenna having a plurality of antenna segments associated therewith. Each a... | 08/07/2007 |
| 7250773 | Circuit for detecting difference in capacitance A circuit for detecting a difference in capacitance between a first capacitor and a second capacitor provided in a sensor includes an oscillator configured to generate an oscillating signal, a phase comparator coupled to the oscillator to output a signal responsive ... | 07/31/2007 |
| 7219270 | Device and method for using a lessened load to measure signal skew at the output of an integrated circuit A device and method are provided for testing the timing of an output signal from a circuit. The output signal can be sent from a circuit contained within a portion of an integrated circuit, and represents a response to a test pattern or stimuli applied to that circu... | 05/15/2007 |
| 7096443 | Method for determining the critical path of an integrated circuit A method of determining the critical path of a circuit includes first determining the paths, their mean path transit times and their path transit time fluctuations. Paths having similar statistical parameters are combined to form one path group. For each path group,... | 08/22/2006 |
| 7015597 | Power regulator for power inverter A power inverter includes a regulator circuit that controls real and reactive power output by the inverter. The regulator measures real and reactive output power by calculating x-phasor components of the inverter's voltage and current output waveforms. Phasor calcul... | 03/21/2006 |
| 6985824 | Frequency measuring device A frequency measuring device can measure the frequency of a noisy power system at high speed. The system voltage is measured at timings obtained by equally dividing one reference-wave period. Voltage vectors are calculated which have tip ends, each voltage vector co... | 01/10/2006 |
| 6919727 | Accurate time measurement system circuit and method Disclosed is a method of measuring the time signal of an electronic device including steps for measuring a true signal and an inverted signal. The measured true path signal and inverted path signal are combined to reduce measurement error and provide an accurate mea... | 07/19/2005 |
| 6806812 | Automated antenna trim for transmitting and receiving semiconductor devices A radio frequency communication device and methods of testing and tuning an antenna attached thereto are disclosed. A radio frequency communication device according to the present invention is disclosed comprising internal circuitry and an antenna having a plurality... | 10/19/2004 |
| 6759838 | Phase-locked loop with dual-mode phase/frequency detection A phase-locked loop with dual-mode phase/frequency detection is provided. The phase-locked loop circuit includes a dual-mode phase/frequency detector, a loop filter, a voltage-controlled oscillator, and a frequency converter. In addition, the dual-mode phase/frequen... | 07/06/2004 |
| 6737852 | Clock skew measuring apparatus and method A clock skew measuring apparatus for measuring a clock skew between a plurality of clock signals to be measured in a device under test, includes: a clock signal selecting element for receiving clock signals and outputting them by selecting one of the clock signals o... | 05/18/2004 |
| 6008663 | Eliminating phase shift in an integrated circuit tester An integrated circuit (IC) testing apparatus automatically detects and eliminates a phase difference between signals. A signal selection circuit 30 selects two test signals from a test pattern applied to a test device and outputs two test signals as a sta... | 12/28/1999 |
| 5710710 | Frequency counter with reduced false correlations An improved frequency counter for more reliably reading the frequency of low level signals by employing a method of separating the desired signal from undesirable noise related signals, wherein the frequency counter comprises signal input amplifier circui... | 01/20/1998 |
| 5703489 | Timing calibration circuit and method for test signals A timing calibration circuit includes a plurality of variable delay circuits each of which is assigned to one of test signal paths to regulate a phase delay time for a signal passing therethrough, a multiplexer for selecting one of the test signal paths w... | 12/30/1997 |
| 5539655 | Apparatus for detecting out of phase of power systems and method for detecting the same An out of phase detecting apparatus according to the present invention includes a measurement unit for measuring an effective power and a current effective value at a tie point of power systems at a predetermined cycle, a power trend detection unit for de... | 07/23/1996 |
| 5471402 | Frequency counter An improved frequency counter for detecting and distinguishing a main input signal from amplifier generated self-oscillating signals, wherein the frequency counter generally includes an input circuit having an amplifier and Schmitt-Trigger, a microprocess... | 11/28/1995 |
| 5452320 | Method for detecting fine frequency deviation A method for detecting a fine frequency deviation generated in a transmission line such as a general public telephone switching network. The method includes the steps of transmitting test signals to a transmission channel to be tested, receiving the test ... | 09/19/1995 |
| 4843328 | Apparatus for using a time interval counter to measure frequency stability Apparatus for measuring the relative stability of two signals is disclosed comprising means for mixing the two signals down to a beat note sine wave and for producing a beat note square wave whose upcrossings are the same as the sine wave. A source of ref... | 06/27/1989 |
| 4810947 | Digital error detector for IFM receiver A process and means for identifying erroneous frequency measurements made by an IFM receiver using a multi-channel delay line discriminator. Expected phase codes are compared with measured phase codes. An error signal is generated when the magnitude of de... | 03/07/1989 |
| 4694263 | Frequency modulation monitor circuit and method A method and apparatus for monitoring a frequency modulated signal including harmonically mixing the modulated signal with a significantly lower reference frequency, dividing the mixed signal, filtering out the reference frequency, rectifying and integrat... | 09/15/1987 |
| 4672308 | Enhanced frequency determination for spectrum analyzers or the like An arrangement is provided for enhancing the accuracy of frequency determination in a spectrum analyzer or the like having a local oscillator heterodyned with and locked to a frequency comb, by providing a determination of whether the local oscillator fre... | 06/09/1987 |
| 4661769 | Measurement of magnitude and phase angle of voltage and current phasors and frequency deviation in power systems Methods for determining magnitude, phase angle and frequency deviation in the sinusoid waveform output of electrical power generation equipment are disclosed. The first method uses a two-state linear Kalman filter to calculate the magnitude and phase angl... | 04/28/1987 |
| 4636716 | Device for testing units containing electrical circuits For the purpose of testing units which contain electrical circuits, an interpretation circuit and a load circuit are connected to the output of the unit being tested by way of a line. A load circuit is provided which contains two constant current sources ... | 01/13/1987 |
| 4628253 | Clock signal test circuit An integrated circuit which has serially connected clock drivers for generating sequential clock signals further includes test circuitry for testing for the occurence of the clock signals. The test circuitry includes a current source for each of the seque... | 12/09/1986 |
| 4547726 | Means and method for measuring power system frequency Samples from a first and second cycle of a system signal are used to generate discrete Fourier transforms for the respective first and second cycle. Multiplication of the discrete Fourier transform of the second cycle by the complex conjugate of the discr... | 10/15/1985 |
| 4484291 | Comparison circuit for determining the statistical equality of two analog signals Signal comparison arrangement for comparing a first and a second analog signal with each other. For each of these signals the number of zero-crossings occurring within each measuring interval of a sequence of N consecutive measuring intervals T(1), T(2), ... | 11/20/1984 |
| 4412299 | Phase jitter detector A phase jitter detector that is ideally suited for use in combination with tone receivers (e.g., tone-to-pulse converters) to provide a speech immune tone detection system or in a measuring instrument to provide a direct measurement of the signal-to-noise... | 10/25/1983 |
| 4405897 | Frequency deviation testing and adjusting system for frequency modulated oscillators Deviation of a frequency modulated oscillator (FMO) is set by applying a square wave test signal to the input of the oscillator so as to generate a predetermined amount of symmetrical periodic frequency shift above and below the rest frequency, i.e., the ... | 09/20/1983 |
| 4399409 | Apparatus for testing the linearity of a frequency modulated oscillator A linearity test signal generator alternately provides a burst of a modulation frequency and no modulation to the modulation input of the frequency modulator oscillator (FMO) under test. A programmable divider is connected to the output of said frequency ... | 08/16/1983 |
| 4399408 | Apparatus for testing the linearity of a frequency modulated oscillator An APC (automatic phase control) circuit is utilized to measure the linearity of an FMO (frequency modulated oscillator). In accordance with a common APC concept a programmable divider is connected to an output of said frequency modulatable oscillator to ... | 08/16/1983 |
| 4370650 | Tone detection circuitry Tone detection circuitry including tone decoder providing a free running frequency determined by timing resistance and timing capacitance connected to it. A control means including a programmable microprocessor establishes a retrieval record based on the ... | 01/25/1983 |
| 4350950 | Frequency measuring method and apparatus The frequency of a pulse signal is measured with the aid of a reference signal generated in an oscillator (11). Both the pulses of the frequency to be measured and the pulses of the reference frequency are counted by separate counters (12, 13) and the cou... | 09/21/1982 |
| 4319329 | Frequency measuring and monitoring apparatus, methods and systems Waveform frequency measuring apparatus and methods utilizing zero-crossing triggered analog-to-digital conversion apparatus combined with Discrete Fourier Transform (DFT) digital computing apparatus accomplish measurement of waveform fundamental frequency... | 03/09/1982 |
| 4317223 | RF Generator monitor circuit An RF generator monitor circuit is provided for checking for variation in frequency of an RF generator outside predetermined limits. The circuit includes means for sampling the output of an RF generator, means for clamping the sample signal to prevent dam... | 02/23/1982 |
| 4313212 | Electrical circuit arrangements, for example for use with communications receivers A fully digitally-controlled system is disclosed which employs synthesized communications receivers to measure received signal frequency with greater resolution than that provided by the receiver alone. Variable frequency I.F. translation is used to provi... | 01/26/1982 |
| 4303979 | Frequency spectrum variation monitoring system In a frequency spectrum variation monitoring system, the values of two parameters including the root mean square (RMS) value of each of the output signals from various detectors disposed at several locations in a nuclear power plant and the RMS value of t... | 12/01/1981 |
| 4258436 | Multichannel RF signal generator A device for generating a plurality of RF signals, all possessing identical odulation characteristics. A clock source triggers an oscillator to produce a precise pulse train that is filtered and fed to a first double balanced mixer for mixing with the outp... | 03/24/1981 |
| 4254505 | Normalization method and apparatus used when quantitatively measuring the reception quality of a received frequency-modulated ultrashort-wave signal A frequency-modulated ultrashort-wave signal is received, but due to wave-reflection phenomena from physical bodies reflecting towards the receiving antenna is amplitude modulated, this amplitude modulation being dependent upon frequency. Derived from the... | 03/03/1981 |
| 4249257 | Radio frequency signals analyzer An analyzer for analyzing radio frequency signals from an FM/PM transmitter ithout prior knowledge of the transmitting frequency. The RF signal is sampled and fed to a mixer where it is mixed with the output from a comb generator having a PRF equal to the ... | 02/03/1981 |
| 4236110 | Digital frequency deviation meter A digital frequency deviation meter for measuring the deviation of an FM signal from a center frequency is disclosed. An incoming FM signal is applied to a counter which is cycled through a series of sequential nonambiguous cyclical states. A storage memo... | 11/25/1980 |
