Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7750618 | System and method for testing a clock circuit A test circuit determines whether a frequency of an output clock signal of a clock circuit is above an output threshold frequency. An input clock signal of the clock circuit is set to an elevated frequency that is higher than a specified frequency. A first counter c... | 07/06/2010 |
| 7429896 | Frequency stability measuring apparatus A frequency stability measuring apparatus for measuring a frequency fluctuation of a signal outputted from a given signal source includes: a reference signal output unit that outputs a reference frequency signal; a mixer that mixes a signal outputted from the signal... | 09/30/2008 |
| 7426368 | Satellite broadcasting converter, control circuit incorporated therein, and detector circuit used in such control circuit In a broadcasting satellite converter adapted to be connected to a BS tuner and fed with a power supply voltage signal from the broadcasting satellite tuner, a receiver circuit includes a mixer, and a plurality of local oscillators connected to the mixer to convert ... | 09/16/2008 |
| 7298130 | Signal detector A circuit for detecting whether an intermittent clock waveform signal of 50 MHz is received or not includes an offset receiver, a charge pump, a capacitor and a hysteresis comparator. A circuit for detecting whether a random data waveform signal of 500 MHz is receiv... | 11/20/2007 |
| 7282937 | On-chip frequency degradation compensation Embodiments of the invention include a trio of reliability oscillators. In one embodiment, an on-chip frequency compensation circuit includes a selectively enabled reliability oscillator to generate a reference oscillating signal, a clocked reliability oscillator to... | 10/16/2007 |
| 7272078 | Efficient clock calibration in electronic equipment A representative measurement indicating a relative oscillation speed of a reference clock during a representative calibration period is ascertained. Multiple calibration periods are defined including first and second calibration periods. The first calibration period... | 09/18/2007 |
| 7191081 | Method for correcting an oscillator frequency A method for correcting an oscillator frequency of in particular a digital transmitter/receiver interface for transmitting measurement signals of a sensor to a control unit. The method includes outputting of a first reference frequency signal by the sensor, the firs... | 03/13/2007 |
| 7144152 | Apparatus for thermal management of multiple core microprocessors An apparatus for managing the temperature of an integrated circuit having a multiple core microprocessor is described. Specifically, thermal sensors are placed at potential hot spots throughout each microprocessor core. A thermal management unit monitors the thermal... | 12/05/2006 |
| 7119452 | Voltage control for wind generators A wind turbine generator control system includes relatively fast regulation of voltage near the individual generators with relatively slower overall reactive power regulation at a substation or wind farm level. The setpoint of the relatively fast voltage regulator i... | 10/10/2006 |
| 7113877 | Signal detection A method, apparatus, and system for detecting a signal of interest. According to some embodiments, a power of a frequency component of a signal is determined. The power is accumulated for a first period and a second period, the second period being shorter than the f... | 09/26/2006 |
| 7066643 | Radio frequency temperature sensor and method of calibrating temperature therefor A radio frequency temperature sensor and a method of calibration temperature therefor are disclosed. An active radio frequency temperature sensor including a ring oscillator, a memory, a frequency counter, a radio frequency transmission interface and a micro-control... | 06/27/2006 |
| 7062164 | Detection of data transmission rates using passing frequency-selective filtering A data receiver, which could be an optical transceiver, a modem, a router hub, is capable of detecting the transmission rate of incoming data. The data is converted to electrical waves appropriate for passive or active bandpass filtering. The frequencies at which th... | 06/13/2006 |
| 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 |
| 7003262 | Method and device for determining sideband ratio of superconduction mixer using comb generator The present invention provides a method and device for determining the sideband ratio of a superconducting mixer using a comb generator. The method includes the steps of: (a) tentatively adjusting the sideband ratio of a mixer for calibration of an output of the com... | 02/21/2006 |
| 6979995 | Frequency measuring circuit and resonant pressure sensor type differential pressure/pressure transmitter using the frequency measuring unit A time difference signal having a pulse width corresponding to the time difference between an output of a resonant pressure sensor and a reference clock is prepared. The pulse width of the time difference signal is expanded by a given magnification. Based on a count... | 12/27/2005 |
| 6977487 | Vehicular alternator failure determination apparatus using commutating device voltage A vehicular alternator failure determination apparatus is capable of making a failure determination accurately. The apparatus includes a maximum voltage detection part (1) for detecting a maximum voltage of an alternator commutating device which commutates an... | 12/20/2005 |
| 6943598 | Reduced-size integrated phase-locked loop A phase-locked loop comprising a comparator generating a control voltage depending on the phase-shift between a reference signal and a feedback signal, an oscillator controlled by the control voltage, generating several phase-shifted signals of same period, one of w... | 09/13/2005 |
| 6941274 | Automated transaction machine The invention relates to an automated transaction machine of the recycling currency type. The machine permits a merchant to both store and withdraw cash. The machine also permits a customer to withdraw cash. The automated transaction machine includes a chest portion... | 09/06/2005 |
| 6941237 | Signal detection A method, apparatus, and system for detecting a signal of interest. According to some embodiments, a power of a frequency component of a signal is determined. The power is accumulated for the long and short term, and a delta integrated power spectrum (e.g., a differ... | 09/06/2005 |
| 6934652 | On-chip temperature measurement technique A temperature monitoring technique that eliminates the need for bipolar devices. In one embodiment of the present invention, a long-channel MOS transistor is configured in a diode connection to sense change in temperature. The diode drives a linear regulator and an ... | 08/23/2005 |
| 6930496 | Range resistors for AC-DC transfer measurements A range resistor, for deployment with a low voltage AC measuring instrument as a voltage range multiplying attenuator, provides increased accuracy in the measurement of high AC voltages at frequencies up to 1 MHz, particularly when large attenuation ratios are neede... | 08/16/2005 |
| 6917191 | Frequency measurement circuit A frequency measurement circuit measures a frequency of an input signal. The frequency measurement circuit includes a frequency measurement unit for counting a reference clock during a counting period having a predetermined number of waves of the input signal. The f... | 07/12/2005 |
| 6867599 | Load-pulled measurement with reference circuit A load-pulled oscillator system in which the oscillator is switched between a distributed measurement section, coupled to a material being monitored, and a constant lumped reference load. ... | 03/15/2005 |
| 6868135 | Method and apparatus for correcting for a phase shift between a transmitter and a receiver A method and apparatus for correcting for a phase shift between a transmitter and receiver comprising the steps of: a) transmitting a signal from a transmitter (14); b) receiving the transmitted signal (1... | 03/15/2005 |
| 6842049 | Method of and apparatus for detecting difference between the frequencies, and phase locked loop circuit An apparatus for detecting a difference between frequencies includes a beat waveform generator which generates a beat waveform signal having a frequency which is equal to a difference between frequencies of a reference clock signal and a target clock signal. A frequ... | 01/11/2005 |
| 6806698 | Quantifying a difference between nodal voltages A method and apparatus that uses the difference between two nodal voltages, such as a temperature-independent voltage and a temperature-dependent voltage, to determine the actual temperature at a point on an integrated circuit is provided. Further, a method and appa... | 10/19/2004 |
| 6788044 | Frequency change measuring device A frequency change measuring device includes frequency divider for frequency dividing a measuring signal to produce frequency-divided signals, first counter for counting the frequency-divides signals to calculate frequency-division numbers, frequency division number... | 09/07/2004 |
| 6750682 | Method of and apparatus for detecting difference between frequencies, and phase locked loop circuit An apparatus for detecting a difference between frequencies includes a beat waveform generator which generates a beat waveform signal having a frequency which is equal to a difference between frequencies of a reference clock signal and a target clock signal. A frequ... | 06/15/2004 |
| 6738269 | Line linkage protective device for electricity generation equipment A device includes a governor for controlling the frequency of the generator of a private power generation equipment, function generating means having a function characteristic for detecting the frequency variation rate of the generator and outputting a large output ... | 05/18/2004 |
| 6717282 | Combined motor and generator dynamometer system A turboshaft or shafted engine, as used in helicopter, aircraft, locomotive, marine engines, and the like, is tested in accordance with a routine maintenance schedule. The turboshaft is drivingly connected to a motor/generator set that also performs the operation of... | 04/06/2004 |
| 6690153 | Method of testing and/or monitoring the system frequency of a microcontroller and a microcontroller A method of testing and/or monitoring the system frequency of a microcontroller, in which the working frequency of a voltage-regulated oscillator or VCO, which is in an operative connection with the microcontroller, is measured, and the system frequency b... | 02/10/2004 |
| 6661217 | Wideband precision current sensor A wideband precision current sensor employs DC-coupled and AC-coupled sensing circuits to generate lower and higher frequency sense signals; which are combined to form a wideband output signal that is proportional to a wideband current of interest. The fr... | 12/09/2003 |
| 6636816 | Vector signal analysis method and apparatus therefor An error-suppression signal measurement system and method therefor is provided. The system transmits a test signal from a first probe, through a device under test, and into a second probe. The probes extract normalization signals from reference signals th... | 10/21/2003 |
| 6597161 | Method and apparatus for spectrum analysis with variable detection latency and multiple layer coherent integrations Provided is a signal detector and method for spectrum analysis and for measuring power of one or more channels of an electrical or optical signal. Each channel may carry a unique modulation tone. A DSP (digital-signal processor) performs DFTs (discrete Fo... | 07/22/2003 |
| 6590376 | Method of deriving a frequency of a pulse signal from alternate sources and method of calibrating same A method derives a frequency of a pulse signal from a line frequency. The method includes measuring a period of a line frequency pulse signal having the line frequency using a measured frequency derived from an oscillator frequency. The method further inc... | 07/08/2003 |
| 6590399 | Measuring parameters of DUT at specified frequency using vector network analyzer A method for taking measurements using a vector network analyzer (VNA) enables a reduction in interference created when the VNA is operated in the presence of external signals. For the method, three measurements are taken, one at a desired measurement fre... | 07/08/2003 |
| 6541951 | Optical measurement of target-light waveform A method for measuring the waveform of light is provided, which makes it possible to synchronize easily the phase of sampling light with the phase of target light even if the target light is ultra-high speed pulsed light and is transmitted by way of long ... | 04/01/2003 |
| 6538517 | Frequency phase detector for differentiating frequencies having small phase differences The invention provides a structure, method and means for receiving a reference frequency and a variable frequency, differentiating the frequencies, and generating a logic pulse in response to a first frequency leading a second frequency, the frequencies h... | 03/25/2003 |
| 6525542 | Apparatus for monitoring the status of devices in electrical protection and control systems A protection and control system incorporates status acquisition apparatus for use in monitoring the status of a device in the protection and control system, such as a protection relay in a high voltage electrical circuit. The status acquisition apparatus ... | 02/25/2003 |
| 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 |
