Matches 1 - 50 out of 202 1 2 3 4 5 >


Match Document Document Title
8907681 Timing skew characterization apparatus and method  
A timing skew characterization apparatus comprises a coarse timing skew characterization circuit, a fine timing skew characterization circuit and a coarse delay cell calibration circuit. The...
8552740 Method of measuring delay in an integrated circuit  
A method of measuring signal delay in a integrated circuit comprising applying a common clock signal at a circuit input and output, applying a test signal at the circuit input, detecting a...
8542003 Test apparatus to test a data signal and a clock signal output from a device under test  
A first timing comparator TCP1 latches a data signal at a timing that corresponds to each edge of a first strobe signal. A first delay element delays a first strobe signal so as to output a first...
8531177 Timing detection device  
A timing detection device includes a draw back amount acquiring unit and a detecting unit. The draw back amount acquiring unit is configured to acquire a draw back amount of a received signal with...
8248094 Acquisition of silicon-on-insulator switching history effects statistics  
A test structure for gathering switching history effect statistics includes a waveform generator circuit that selectively generates a first test waveform representative of a 1SW transistor...
8159209 Digital signal delay measuring circuit and digital signal delay measuring method  
A digital signal delay measuring circuit for measuring a delay time of a digital signal of a scan-testable digital circuit inside a device to be tested is provided. The circuit includes:...
7671579 Method and apparatus for quantifying and minimizing skew between signals  
Delay associated with each of two signals along respective transmission paths is accurately measured using a delay measurement circuit that is fabricated in situ on the actual device where the...
7635985 Test pattern for analyzing delay characteristic of interconnection line and method for analyzing delay characteristic of interconnection line using the same  
A test pattern for analyzing a delay characteristic of an interconnection line and a method of analyzing a delay characteristic of an interconnection line using the test pattern are provided. The...
7495429 Apparatus and method for test, characterization, and calibration of microprocessor-based and digital signal processor-based integrated circuit digital delay lines  
A circuit board with a processing unit and a delay line with a controllable number of delay elements fabricated thereon includes apparatus for testing and calibrating the delay line elements. In...
7394238 High frequency delay circuit and test apparatus  
A high frequency delay circuit operable to output a high frequency signal delayed for a desired delay time. The high frequency delay circuit includes: a variable delay circuit operable to receive...
7369600 Burst communications apparatus and method using tapped delay lines  
A communications apparatus and method use tapped delay lines as multiplexers and demultiplexers. In one embodiment, a receiver (100) uses a tapped delay line (110) as a demultiplexer to acquire a...
7355380 Methods and apparatus for testing delay locked loops and clock skew  
According to the methods of the invention, a further delayed DLL signal is compared to the reference clock and a delayed reference clock signal is compared to a DLL signal. These two comparisons...
7352826 Analog delay circuit  
An analog delay circuit to impart a group delay to an analog input signal is described. The analog delay circuit may comprise a capacitor to impart at least a portion of the group delay to the...
7308625 Delay-fault testing method, related system and circuit  
A testing approach involves selective application of clock signals to target circuitry. In an example embodiment (300), a target circuit (332) having logic circuitry that processes data in...
7268531 Apparatus for improving stability and lock time for synchronous circuits  
Delay-locked loops, signal locking methods and devices and system incorporating delay-locked loops are described. A delay-locked loop includes a forward delay path, a feedback delay path, a phase...
7123181 Surveillance method and apparatus  
An inexpensive, small, low-power consumption, wide-band, high resolution spectrum analyzer is provided as a listening device for throw-away applications such as surveillance that involve...
6680606 Electrical sampler for non-simultaneous sampling  
An electrical sampler device has a plurality of samplers for sampling an electrical signal. Each of the samplers is responsive to a corresponding sampling point. The electrical sampler device also...
6509729 Multiple simultaneous optical frequency measurement  
A signal processing apparatus for providing concurrent electrical frequency measurements of multiple, time-coincident signal inputs. In one embodiment of the present invention, an input signal is...
6437553 Method for delay line linearity testing  
The present invention provides both differential and integral non-linearity measurement capabilities with a minimum of additional hardware and a test time reduction of several orders of magnitude....
6316944 Effective netlength calculation  
The invention accurately determines propagation delay for a sawtooth pattern. Through measurement, the actual delays added per bend in the sawtooth pattern are determined and the values are then...
6233288 Spectrum analyzer  
A spectrum analyzer having an improved local oscillator for use in a digital step sweep is capable of minimizing a dynamic spurious response which is inverse proportional to a unit step time in...
5825172 Continuous up/down spectrum scaling of signals  
A rotating transmission line for use in spectrum up-scaling or down-scaling of signals. The rotating medium is characterized by different velocity gradients, whereby when a signal propagates in...
5764044 Process for producing time dependent waveforms of positive and negative symmetrical sequence components of a power system's voltages or currents  
A numerical comparator employs numerical techniques based upon the behavior of the cylinder unit to compare phasors in real time. In one application, the torque signal generated by the numerical...
5497161 Angle of arrival (AOA) solution using a single receiver  
A solution to the AOA problem is provided, receiving the data via a plurality of antennas, which uses a switching network to couple the antennas to a single receiver and a single analog-to-digital...
5457637 Flash waveform analyzer method and device  
A flash waveform analyzer (10) includes a transmission line (12) for propagating a signal from an input (14). The transmission line (12) contains a plurality of samplers (16) located at different...
5440228 Simultaneous signals IFM receiver using plural delay line correlators  
A simultaneous signals frequency measurement receiver comprising a number n of delay line correlators, with a complete set of n, delays, a number 2n of digitizers, computational means to define an...
5424631 Hybrid instantaneous frequency measurement compressive receiver apparatus and method  
The present invention hybrid instantaneous frequency measurement (IFM) compressive receiver processes a wide bandwidth of incoming signals in two processing channels, where a small time delay is...
5343207 Real-time wide-band compressive-receiver system  
The input ports (18) of an imaging compressive receiver (20) receive from a tapped delay line (16) progressively delayed versions of a received signal s(t). Because of the delays, a signal...
5327277 Method and apparatus for determining equalization delays in a transmission system and related apparatus  
To determine the equalisation delay of a substation (S3), the main station (C) of a transmission system measures, during an initial coarse measurement, the time interval between the sending of a...
5323103 Frequency measurement receiver with means to resolve two folding frequencies of complex signals  
This is an arrangement to find two folding frequencies that fold into one frequency bin, which will save hardware. The input frequency in down converted into I and Q channels. Each channel...
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...
5220683 Ultra-widebandwidth compressive receiver  
An ultra-widebandwidth compressive receiver includes a power divider for processing a composite input signal consisting of individual input signals. The power divider provides a plurality of power...
5198748 Frequency measurement receiver with bandwidth improvement through synchronized phase shifted sampling  
A technique covered by patent applicaton S.N. 07/672,309 divides power of an input signal to two A/D converters. A processor receives the outputs of the two A/D converters. The input signal is...
5109188 Instantaneous frequency measurement receiver with bandwidth improvement through phase shifted sampling of real signals  
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...
4973898 Digital spectral normalizer  
A digital spectral normalizer for subtracting out the mean of an input sil to be normalized to obtain a normalized output signal. The normalizer comprises a variable gain amplifier which adjusts...
4951219 Method and a circuit for determining the momentary frequency of a signal  
A method and a circuit for determining the momentary frequency of an analog signal s(t) which is variable over time within a given frequency bandwidth Δf, as an N-bit number in an N-bit coding...
4931704 Ultrafast sampling oscilloscope  
A femtosecond sampling oscilloscope includes a femtosecond laser for generating a pulse of light in the femtosecond range and a beam splitter for splitting the pulse of light into pulses traveling...
4918373 R.F. phase noise test set using fiber optic delay line  
A noise test set for analyzing the presence of phase noise in a radar signal. A delay line discriminator using a fiber optic cable and laser light modulated by the radar signal are used. Both...
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...
4859934 Apparatus for measuring the frequency of microwave signals  
A microwave frequency detection receiver utilizing a prescaler comprised of one or a plurality of cascaded analog frequency dividers for down-converting received microwave signals to a...
4859843 Method and apparatus for optical signal analysis using a gated modulation source and an optical delay circuit to achieve a self-homodyne receiver  
An actual optical field spectrum is mixed down to baseband and can be observed directly to measure the optical field spectrum of an optical signal based on a local oscillator approach. This local...
4855969 Dynamic timing reference alignment system  
Disclosed is a test system and a method for providing a timing function that dynamically calculates and adjusts the phase delay between an internal timing reference and an externally derived...
4845691 Group delay time measurement apparatus with automatic aperture value setting function  
A frequency converter receives a signal to be measured and a local oscillation signal supplied from a local oscillator and ouputs an intermediate frequency signal. A phase detector detects a phase...
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...
4806853 High accuracy frequency modulation waveform tester  
The maximum and minimum depth of modulation of a carrier signal frequency modulated by a modulating sine wave is measured by a frequency counter responsive to an external gate. The external gate...
4799165 Level detecting waveform sampling system  
A level detecting waveform digitizer for repetitively sampling an analog waveform and converting analog samples into representative digital data is provided with a predictive time base circuit for...
4771232 Non-interruptive spectrum analyzer for digital modems  
A system and method are provided which allow a user to obtain a plot of the amplitude response of a channel such as a telephone line in the band occupied by a modem signal without interrupting or...
4745356 Method and apparatus for quickly and precisely measuring the frequency of a signal  
In a method for measuring the frequency of a signal, in which counting pulses are counted and the counting result is emitted in the form of a digital signal, the counting pulses are derived from...
4730257 Apparatus for analyzing signals, to obtain parameters of constituents  
An apparatus for analyzing a signal takes the Fourier Transform of both an original signal and a shifted signal, which has previously been subjected to a shift, for example a time shift, relative...
4710705 Noise removal circuit for use in a partial discharge measuring device of a high voltage apparatus  
A noise removal circuit for use in partial discharge measuring device of a high voltage apparatus. The circuit includes a first phase shift/reduction device responsive to an input signal for...

Matches 1 - 50 out of 202 1 2 3 4 5 >