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| Number | Title | Issue Date |
| 8164322 | Phase-difference-corresponding-value measurement device, gain imbalance measurement device, method, program, and recording medium A modulation error measurement device according to the present invention receives a demodulated signal containing a demodulated I signal and a demodulated Q signal from a quadrature demodulator receiving an RF signal output by a quadrature modulator and applying the... | 04/24/2012 |
| 8067932 | Advanced real-time grid monitoring system and method This invention deals with an advanced Real-time Grid Monitoring System (RTGMS) suitable for both single-phase and three-phase electric power systems. This invention provides an essential signal processing block to be used as a part of complex systems either focused ... | 11/29/2011 |
| 7378854 | Dual sine-wave time stamp method and apparatus A time of an event can be determined by acquiring an amplitude, at the time of the event, of at least two periodic timing signals that are out of phase with each other. The time of the event within a cycle of at least one of the timing signals can be determined as a... | 05/27/2008 |
| 7339365 | Phase detector and method of phase detection In order to provide a phase detector and a method of phase detection which are distinguished by greater sensitivity and simple implementability, at least one differential signal of two input signals (Ua; Ub) may be formed over at least one pred... | 03/04/2008 |
| 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 |
| 7227346 | Two channel digital phase detector The invention is directed to a digital phase detector that comprises a splitter and phase shifter to receive a signal of a device under test and produce a first signal that is substantially identical to the received signal and a second signal that is phase shifted r... | 06/05/2007 |
| 7222055 | High bandwidth real-time oscilloscope A method and apparatus for digitizing a signal. The method comprises the steps of receiving an input analog signal, splitting the received input analog signal into a plurality of signals and frequency converting at least one of the signals in accordance with a prede... | 05/22/2007 |
| 7219037 | High bandwidth oscilloscope A method for improving bandwidth of an oscilloscope involves, in preferred embodiments, the use of frequency up-conversion and down-conversion techniques. In an illustrative embodiment the technique involves separating an input signal into a high frequency content a... | 05/15/2007 |
| 7146146 | Systems and methods for coherent adaptive calibration in a receiver An improved calibration system for a receiver is configured to calibrate the I and Q paths to correct for gain mismatch and quadrature phase errors. In a preferred embodiment, the calibration system calibrates the I and Q paths by using a calibration signal and a re... | 12/05/2006 |
| 7139684 | High bandwidth real time oscilloscope A method and apparatus for digitizing a data signal, the method comprising the steps of receiving an input analog data signal, splitting the received input analog data signal into a plurality of split signals, and mixing at least one of the split signals with a pred... | 11/21/2006 |
| 7135896 | Output buffer circuit and semiconductor integrated circuit Replica output buffers, having the same input/output characteristic as that of an output buffer, respond to the rise of a TEST signal generated by a test pulse generating circuit and causes an output signal to rise at a through rate according to voltage of an SL_SET... | 11/14/2006 |
| 7130359 | Self calibrating receive path correction system in a receiver A receiver (50) includes a self-calibrating receive path correction system for correction of I/Q gain and phase imbalances in a radio frequency signal. The system includes a signal-processing block (53), an I/Q phase imbalance detection and correction ... | 10/31/2006 |
| 7110899 | Phase measurement in measuring device Methods and apparatus for determining the phase of a signal in a measurement device having a digital signal processor are described. The signal is digitised and the digitised signal, or a signal derived therefrom, is numerically correlated with a numerically generat... | 09/19/2006 |
| 7106064 | Method and apparatus for quadrature detection and MRI system A method of eliminating unnecessary frequency components using a quadrature detector. The method includes converting an analog input signal into a digital signal f1(t), and the signal f1 (t) is delayed by a sampling time τ to form a signal f2 (... | 09/12/2006 |
| 7076698 | Vector monitor, related method of controlling a transmitter and transmitter employing the same The present invention is directed to a vector monitor for use with a transmitter employing in-phase and quadrature phase input and feedback signals, and a method of controlling a transmitter. In one embodiment, the vector monitor includes an error detection circuit ... | 07/11/2006 |
| 7069284 | Apparatus and method for correcting signal imbalances using complex multiplication A complex multiplier is described for filtering a signal in the frequency domain. In one embodiment, additional, independent frequency coefficients are supplied by the complex multiplier so that gain and/or phase of the signal may be independently modified (i.e., ga... | 06/27/2006 |
| 7058548 | High bandwidth real-time oscilloscope A method and apparatus for digitizing a data signal. An input analog data signal, is received and split into a plurality of split signals. At least one of the split signals is mixed with a predetermined periodic function with a predetermined frequency. The split sig... | 06/06/2006 |
| 7053626 | Device and method for monitoring the connection of an electrical supply unit The invention relates to a device and a method for monitoring the connection of an electrical supply unit comprising voltage detection (32) detecting phase voltage (14), current detection (32) detecting phase voltages (38), a transformati... | 05/30/2006 |
| 7012420 | Measuring device to record values, in particular angles or linear segments A measuring device for the recording of values, in particular angles or linear values, includes a measured value processor and a sensor arrangement, which supplies two phase-shifted signals. Connected in series to the sensor arrangement is an adjustment unit, which ... | 03/14/2006 |
| 6999528 | I/Q demodulator device with three power detectors and two A/D converters The present invention relates to a method and a device for the I/Q demodulation of modulated RF signals. The I/Q demodulator (60) has a first input for the RF signal (61) to be demodulated and a second input for a RF signal (62) originating from... | 02/14/2006 |
| 6949958 | Phase comparator capable of tolerating a non-50% duty-cycle clocks A method and circuit for achieving minimum latency data transfer between two mesochronous (same frequency, different phase) clock domains is disclosed. This circuit supports arbitrary phase relationships between two clock domains and is tolerant of temperature and v... | 09/27/2005 |
| 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 |
| 6909270 | Phase detector capable of detecting an accumulated value of phase displacement at a high speed and frequency stability measuring apparatus for arbitrary nominal frequency using the same A phase region detector receives in-phase signal I representing in-phase component and quadrature signal Q representing quadrature component of a first signal and second signal respectively, equally divides an angle range of 2 π into a plurality M of three or more ... | 06/21/2005 |
| 6903556 | Method and apparatus for testing laminated cores of electrical machines There is provided an apparatus and associated method for the testing of a laminated core (100) for an electrical machine. The apparatus supplies an excitation signal to the winding (102) of the electrical machine which is of a frequency higher than the... | 06/07/2005 |
| 6803776 | Current-comparator-based four-terminal resistance bridge for power frequencies A current comparator technique is applied to four-terminal resistance measurements for obtaining a highly accurate AC resistance bridge at power frequencies of 50 Hz to 60 Hz. Active circuits are used to establish equal voltage drops between the potential terminals ... | 10/12/2004 |
| 6794857 | Apparatus and method for measuring a phase delay characteristic A phase delay characteristic measuring apparatus includes an in-phase component calculating means for outputting a correlation value between input sampling data of the input signal and the output signal and ideal sine waveform data as a baseband I signal (in-phase c... | 09/21/2004 |
| 6794858 | Receiving level measuring circuit A receiving level measuring circuit, which is capable of improving measuring accuracy of a receiving level by correcting phase rotation caused by a frequency error between oscillators included in a transmitter and a receiver and by inhibiting an inappropriate correc... | 09/21/2004 |
| 6700366 | Very fast swept spectrum analyzer Analyzing a swept spectrum signal formed by mixing a ramping local oscillator and an input signal to generate an IF signal, the resulting IF signal having a phase change with respect to the input signal, the phase change including a quadratic portion. For... | 03/02/2004 |
| 6590377 | Narrow band frequency detection circuit A frequency detection circuit is disclosed that employs a phase lock loop circuit in operative cooperation with a microprocessor. The microprocessor provides a control signal to an oscillator of the phase lock loop circuit so as to control its free-runnin... | 07/08/2003 |
| 6586922 | Phase shift circuit and FM detector circuit Transistors (12a, 12b) turn on and off with mutually opposite phase input signals. Capacitors (16a, 16b) discharge when the transistors (12a, 12b) turn on, and capacitors (16a, 16b) are charged by constant current from constant current sources (18a, 18b) ... | 07/01/2003 |
| 6483288 | Engagement detection circuit An engagement detection circuit for a clock recovery circuit consisting of a phase detector (3), a counter element (6) and a flip-flop (8). By employing a low-pass element (12) and a trigger element (13) connected downstream, a preliminary and a final eng... | 11/19/2002 |
| 6340883 | Wide band IQ splitting apparatus and calibration method therefor with balanced amplitude and phase between I and Q The present invention provides a wide band IQ splitting apparatus suitable for using in a spectrum analyzer. A quadrature oscillator 30 generates a pair of quadrature signals. An amplitude and phase adjuster 32 receives the quadrature signals and adjusts ... | 01/22/2002 |
| 5808463 | Method and apparatus for measuring adjacent channel power using complex fourier transform A method for measuring an adjacent channel power of a device under test (DUT) such as a radio transmitter. The method comprises the steps of performing a frequency conversion to convert a transmitting signal of the DUT to an intermediate frequency signal;... | 09/15/1998 |
| 5789927 | Baseband measurement of RF power amplifier distortion An RF power amplifier distortion measurement system measures amplitude and phase distortion of a microwave/RF power amplifier by phase quadrature down-conversion of each of an RF amplifier's input signal and amplified output signals to baseband in-phase (... | 08/04/1998 |
| 5241173 | Readhead for producing signals when travelling along a scale having a set-up detector for detecting alignment of quadrature signals A readhead 10 traverses along a scale 12, producing square wave signals in quadrature on lines 24,26. These are counted by an external counter 28 to indicate the position along the scale. The square waves cannot be used to monitor the orientation and stan... | 08/31/1993 |
| 5235287 | Frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals using sampling rate selection This is a technique for extending the frequency range which employs a power divider having two outputs, one output being supplied to a first A/D converter, and the other output being supplied via a delay device to a second A/D converter. A processor recei... | 08/10/1993 |
| 5218289 | Electronic device for the measurement of time lags The disclosure relates to the measurement of small time lags between a signal edge and a reference instant defined by another signal edge. It consists of the use of a signal edge for the prompting, by means of shock-excited resonating filters, of the appe... | 06/08/1993 |
| 5128609 | Setting up of quadrature signals A device to assist in setting up the pitch, roll, yaw and standoff of a read head relative to a scale, so as to improve the quadrature relationship of its outputs. Two superimposed Lissajous figures are produced on an oscilloscope screen. One of these fig... | 07/07/1992 |
| 5001419 | Method of deriving an AC waveform from two phase shifted electrical signals The voltage between two objects is measured utilizing an electro-optic crystal exhibiting birefringence in two axes (slow and fast) mutually orthogonal to an optic axis extending between the two objects. Two collimated light beams polarized at an angle to... | 03/19/1991 |
| 4901255 | Method and apparatus for evaluating quadrature encoders A method and apparatus for evaluating the performance of a device, such as a quadrature encoder, which generates at least two electrical wave train signals, each varying between first and second states and the two normally being out of phase one with the ... | 02/13/1990 |
