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| Number | Title | Issue Date |
| 7557587 | Control apparatus, semiconductor integrated circuit apparatus, and source voltage supply control system An excluding unit is controlled by a control signal received from a control unit, and based on the control signal a determination is made for each of circuit blocks as to whether either a voltage signal at a position of its corresponding circuit block or a signal in... | 07/07/2009 |
| 7482817 | Method and an apparatus for measuring the input threshold level of device under test A signal including at least one group of a group comprised of two slopes having different gradients and a known temporal position relationship is applied to a device under test, the time intervals between the specific transitions of the logic level produced in the o... | 01/27/2009 |
| 7427867 | Method and system for non-destructive evaluation of conducting structures Method and system for non-destructive evaluation for a conducting structure by measuring the electrical impulse response thereof including applying a PRBS test input signal to the conducting structure, detecting an output signal from the conducting structure and pro... | 09/23/2008 |
| 7395163 | Method of detecting system function by measuring frequency response Real time battery impedance spectrum is acquired using one time record, Compensated Synchronous Detection (CSD). This parallel method enables battery diagnostics. The excitation current to a test battery is a sum of equal amplitude sin waves of a few frequencies spr... | 07/01/2008 |
| 7363563 | Systems and methods for a built in test circuit for asynchronous testing of high-speed transceivers Methods and apparatus provide a transceiver, such as a serializer/deserializer device (SerDes), with enhanced built-in self test (BIST). A built-in self test circuit is provided that decouples a clock signal used for receiving data from a clock signal used in transm... | 04/22/2008 |
| 7323883 | Phase measurement device, method, program, and recording medium When a signal having two or more frequency components is fed to a circuit to be measured, a phase of the signal output from the circuit to be measured is measured. A phase measurement device measures an output when an input signal having two input frequency componen... | 01/29/2008 |
| 7285962 | Method and apparatus for evaluating susceptibility to common mode noise in a computer system A system for injecting noise signals onto power generated by a power source comprising: a voltage source; a device under test having a power input in operable communication with the noise introduction apparatus; and a noise introduction apparatus interposed between ... | 10/23/2007 |
| 7251284 | QAM receiver A QAM receiver is disclosed. According to one aspect, a QAM receiver includes a signal input for receiving an analog input signal. Further, the QAM receiver includes an anti-aliasing filter and a series connected analog/digital converter for converting the received ... | 07/31/2007 |
| 7251225 | Signal splitting method for limiting peak power in a CDMA system The invention is a method for limiting the peak transmit power in a CDMA communication system. At least one of first and second high transmit power regions are separated into a plurality of high transmit power subregions. The high transmit power subregions of the pl... | 07/31/2007 |
| 7245129 | Apparatus for and method of cable diagnostics utilizing time domain reflectometry A novel mechanism for performing high accuracy cable diagnostics. The mechanism utilizes time domain reflectometry (TDR) to detect and identify cable faults, perform estimations of cable length, identify cable topology, identify load and irregular impedance on metal... | 07/17/2007 |
| 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 voltage and a third phase voltage of the three-phase supply voltage. The... | 05/15/2007 |
| 7095264 | Programmable jitter signal generator A programmable jitter signal generator is provided that includes a jitter distribution control unit, a selection unit in signal communication with the jitter distribution control unit, and a delay unit in signal communication with the selection unit; and a correspon... | 08/22/2006 |
| 7072781 | Architecture for generating adaptive arbitrary waveforms A test system having a feedback loop that facilitates adjusting an output test waveform to a DUT/CUT (Device Under Test/Circuit Under Test) on-the-fly according to changing DUT/CUT parameters. The system includes a tester having an arbitrary waveform generator (AWG)... | 07/04/2006 |
| 7061255 | Corrosion monitoring system A system for monitoring corrosion in metal by comparing a test sample exposed to a corrosion causing environment and a reference sample exposed to a protected environment. An AC voltage source generates a square wave signal oscillating between ground and voltage Vcc... | 06/13/2006 |
| 7030627 | Wideband complex radio frequency impedance measurement Impedance of an unknown load is determined by applying a reference signal from a signal generator through a multi-position switch to the unknown load, a first known calibration impedance, and second known impedance, which can be an open circuit, while measuring the ... | 04/18/2006 |
| 7015701 | Highly time resolved impedance spectroscopy A highly time resolved impedance spectroscopy enhances measurement of the dynamics of non-stationary systems with enhanced time resolution. The highly time resolved impedance spectroscopy includes an optimized, frequency rich a.c., or transient, voltage signal is us... | 03/21/2006 |
| 6980116 | Method for failure detection in a radio frequency device A method for detecting a failure in a radio frequency (RF) device (200) that includes a transistor (210) having a first terminal at an RF input (220), a second terminal at an RF output (260), and a third terminal at an RF common (230 | 12/27/2005 |
| 6943712 | Voltage built-in real-time digital non-linearity measurement device and method for analog to digital converters A nonlinearity detection system and method for an analog to digital converter (ADC) includes a triangular wave generator that generates a triangular wave that is output to the ADC. A differentiator module communicates with the ADC and generates an output signal that... | 09/13/2005 |
| 6943561 | Method of and an apparatus for collecting RF input and output and biasing signal data of a device under test Radio Frequency (RF) signal network measurement data of a device under test are acquired by exciting the device using a modulated RF excitation signal, while measuring RF signal data at the signal ports of the device, measuring bias signal data, and processing the R... | 09/13/2005 |
| 6940286 | Electrical impedance tomography Methods and apparatus are provided for obtaining a representation of the distribution of electrical impedance within a multiphase flow with an electrically continuous or discontinuous principle flow contained within an electrically conductive solid ring electrode, i... | 09/06/2005 |
| 6788071 | Method and apparatus for generating a voltage across a membrane A method and apparatus for generating a transmembrane voltage, including a semiconductive substrate having a surface for receiving a membrane thereon, and a light source for illuminating at least a portion of the semiconductive substrate. Measurement of current thro... | 09/07/2004 |
| 6727721 | Method for switching from a first operating condition of an integrated circuit to a second operating condition of the integrated circuit The invention provides a method for switching from a first operating condition of an integrated circuit to a second operating condition of the integrated circuit differing from the first operating condition. To that end, the output signal generated at a circuit outp... | 04/27/2004 |
| 6636722 | Broadband receiver amplitude/phase normalization using a broadband temperature compensated noise source and a pseudo random sequence generator A method of broadband receiver amplitude/phase normalization uses internal normalization sources--a thermally compensated noise source and a pseudo random sequence generator. A calibrated signal is applied to the input of the broadband receiver and proces... | 10/21/2003 |
| 6549019 | Testing device for evaluating the immunity of an electronic device to electromagnetic noise A testing device generates electromagnetic noise such as transients, power interruptions and Radio Frequency Interference (RFI) for application to an electronic device to test the immunity of the electronic device to electromagnetic noise or to test the p... | 04/15/2003 |
| 6396286 | Apparatus and method for testing computer equipment for susceptibility to neutral to ground noise The power supply of equipment being tested for common mode noise problems is connected to a source of power with the power and neutral input terminals of the power supply isolated from the power ground. Recorded common mode noise signals are then inserted... | 05/28/2002 |
| 6373260 | Single cable, single point, stimulus and response probing system and method A single cable, single point stimulus and response probing system allows the measurement of both low impedance stimulus measurements and high impedance response measurements using a single probe cable. Circuitry located within the probe cable receives sti... | 04/16/2002 |
| 6285197 | System and method for generating a jittered test signal A jitter unit converts a stable input test signal into a jittering output test signal used to test the jitter tolerance of electronic equipment. This jitter device allows any test or sample signal (analog or digital, video or audio) to be used for testing... | 09/04/2001 |
| 6268735 | Noise source module for microwave test systems A module for use in automatic test equipment is disclosed. The module is especially useful for measuring noise parameters of high frequency devices. The module includes a noise generator and a plurality of EEPROM's that store reflection coefficients and E... | 07/31/2001 |
| 6177802 | System and method for detecting defects in an interlayer dielectric of a semiconductor device using the hall-effect A system for detecting defects in an interlayer dielectric (ILD) interposed between first and second conductive lines lying adjacent each other along a first plane is provided. A processor controls general operations of the system. A voltage source adapte... | 01/23/2001 |
| 6172507 | Circuit configuration for measuring resistance and leakage A circuit configuration for measuring resistance and/or leakage between two nodes, which includes a current source for feeding a test current into one of the two nodes and a circuit element that detects the voltage resulting between the two nodes. The out... | 01/09/2001 |
| 6064212 | Method for determining the transmission characteristics of an electric line The invention relates to a method for determining the transmission characteristics (H(jf)) of an electric line (2) in an ISDN system, in which a test signal (m(t)) is applied to the line (2) at one end, and at the other end of the line (2) the received si... | 05/16/2000 |
| 5977774 | Method for detecting open circuits with a measurement device A method for determining whether a circuit under test is open is presented. A digital-to-analog converter is dithered to generate a known signal. This known signal is summed with an external attenuation signal which is brought into the system from a probe... | 11/02/1999 |
| 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 memory. The test signal is read out, converted to analog f... | 10/06/1998 |
| 5818905 | Subscriber line impedance measurement method and measuring circuit A measurement method and measuring circuit are described for high-speed measurement of subscriber line impedance without the influence of counter electromotive force of the bell circuit or hum noise. A measurement current is supplied from a controlled-cur... | 10/06/1998 |
| 5760596 | Testing series passive components without contacting the driven node A method of testing series passive components in electronic assemblies. Only one test pin per passive component is required, thereby reducing the cost and complexity of test fixtures and the electronic assemblies. A passive component is connected between ... | 06/02/1998 |
| 5708363 | Liquid conductivity measurement system using a variable-frequency AC voltage A liquid conductivity measurement system is disclosed that accurately measures a liquid's conductivity over a range spanning at least several orders of magnitude using just a single sensor, but minimizing the adverse effects of capacitive and other non-li... | 01/13/1998 |
| 5701082 | Probe for sensing moculated signals and method of using same Apparatus and method for low cost monitoring the level of signal at a test point in a system for susceptibility to electromagnetic fields. A probe, including a detector diode, and a non-metallic, electrically overdamped conductor, which is transparent to ... | 12/23/1997 |
| 5689192 | Method for simulating a controlled voltage for testing circuits for electromagnetic susceptibility Apparatus and method for low cost monitoring the level of signal at a test point in a system for susceptibility to electromagnetic fields. A probe, including a detector diode, and a non-metallic, electrically overdamped conductor, which is transparent to ... | 11/18/1997 |
| 5514969 | Impedance measurement in a high-voltage power system A power monitoring instrument evaluates and displays the source impedance, load impedance, and distribution system impedance of an alternating current power system using voltage and current measurements taken at a source and load of the power system. The ... | 05/07/1996 |
| 5488310 | Return-loss detection for serial digital source A return-loss detector for a serial digital signal source uses a return-loss bridge circuit to exploit the broadband spectral characteristics of a serial digital signal from the signal source to monitor the termination conditions of a system being driven.... | 01/30/1996 |
