465 results about "Arbitrary waveform generator" patented technology

An arbitrary waveform generator (AWG) for producing an analog output current signal includes a random access memory (RAM), a programmable logic device (PLD), a programmable pattern generator, several digital-to analog converters (DACS) and a current multiplexer. The RAM store data sequences representing the analog waveform to be generated. The pattern generator read addresses the RAM causing it to sequentially read out its stored data sequence to the PLD. The PLD routes selected fields of each data sequence word to one or more of the DACs in response to timing signals provided by the pattern generator. Each DAC produces an output current of magnitude determined by its input waveform and range data. The pattern generator also signals the analog multiplexer to sum currents produced by one or more selected DACs to produce the AWG output waveform. The nature of the AWG output waveform is flexibly determined by the nature of the data sequence and the frequency at which it is read out of the RAM, the manner in which the PLD routes the data sequence to the DACs, the value of the range data supplied to each DAC, and the output pattern generated by the pattern generator. The flexible AWG architecture permits the AWG to be appropriately configured for various combinations of output waveform frequency, bandwidth and resolution requirements.

An enhancement that improves the performance of test and measurement equipment such as digital oscilloscopes and arbitrary waveform generators through the use of compression and decompression is described. The present invention is particularly effective for compressing and decompressing high-speed, bandlimited analog signals that are not appropriately or cannot effectively be compressed by prior art speech, audio, image, and video compression algorithms due to various limitations of such prior art compression solutions. The present invention improves digital oscilloscopes by compressing the sampled version of an analog waveform under observation in real time, allowing a significantly longer duration of the waveform to be stored in the oscilloscope's capture memory, when compared with the duration of the same signal's uncompressed waveform stored in the same memory. Similarly, the present invention improves arbitrary waveform generators by storing a compressed version of a desired arbitrary waveform, instead of the uncompressed version of the arbitrary waveform, in the signal generator's waveform memory. During signal generation, the compressed waveform is decompressed in real time. The uncompressed waveform drives a D/A converter that generates the desired analog waveform. The present invention's simplicity, and its ability to be implemented using parallel compression and decompression elements, allows its use at the high sampling rates of test and measurement instruments. Using the present invention, storage elements in test and measurement equipment can hold significantly longer waveforms in a fixed amount of memory. Users of the present invention can also determine the proper balance between the fidelity and the duration of the decompressed waveform by adjusting various compression and decompression control parameters.

A method, device and/or system for generating arbitrary waveforms of a desired shape that can be used for generating a stimulation pulse for medical purposes such as for spinal cord stimulation therapy, where such arbitrary waveforms can also be used for charge balancing purposes.

The invention relates to a radar target intermediate frequency (IR) echo simulation system based on multi-beam amplitude-comparison angle measurement and a control method thereof, relating to the field of radar target echo simulation. The system comprises three target echo simulation boards and an arbitrary waveform generator instrument fixture, wherein the echo simulation boards are designed with a computer module PC104, a field programmable gate array (FPGA), direct digital synthesis (DDS) technique and a simulation circuit as cores; and the arbitrary waveform generator instrument fixture is designed with instrument programming control as the core. According to the invention, simultaneous 6-channel simulated target IR echo simulation of the radar of the multi-beam amplitude-comparison angle measurement system is realized, parameters of the simulated target echo such as distance, delay, echo amplitude, Doppler shift, pattern, direction pattern modulation, noise superposition and the like can be controlled, single-channel switching and output of dual-beam echo is realized, and the test use requirement of the radar signal processor of the system is met. In the invention, the arbitrary waveform generator instrument frock is utilized, thus improving the amplitude precision of the output echo signals; and the control program in the FPGA in the target echo simulation boards is designed by the soft IP core, thus providing convenience for hardware transplanting and clipping.

A transmitter/receiver arrangement comprises a digital arbitrary waveform generator AWG connected to a transmitter. Said waveform generator is configured to generate an arbitrary waveform within a given bandwidth. Said transmitter/receiver arrangement further comprises an antenna arrangement configured to emit a transmitter signal, and to receive an incident signal, a receiver configured to receive a receiver signal, and an analogue isolator connected to said antenna arrangement, said transmitter, and said receiver. Said analogue isolator is adapted to route said transmitter signal from said transmitter to said antenna arrangement, and said incident signal from said antenna arrangement to said receiver, and to isolate said transmitter signal from said receiver signal. Said receiver is adapted to cancel any residual transmitter signal in said receiver signal by means of at least one digital model of at least said isolator, said antenna arrangement, and said transmitter.

This invention relates to one high speed random wave generator based on FPGA, which adopts DDS technique with data sample rate more than 1GHz and comprises CPU, parallel data phase generation part, wave shape memory part, plug and filter part, parallel and series conversion circuit and DAC, wherein, the parallel data phase generation adopts parallel process to generate multiple data phase In one time clock to get multiple data; then it uses FPGA series and parallel conversion circuit to output the data to DAC into virtual volume.

A fast switching arbitrary frequency light source for broadband spectroscopic applications. The light source may operate near 1.6 um based on sideband tuning using an electro-optic modulator driven by an arbitrary waveform generator. A Fabry-Perot filter cavity selects a single sideband of the light source. The finesse (FSR/Δν_FWHM) of the filter cavity may be chosen to enable rapid frequency switching at rates up to 5 MHz over a frequency range of 40 GHz (1.3 cm⁻¹). The bandwidth, speed and spectral purity are high enough for spectroscopic applications where rapid and discrete frequency scans are needed. Significant signal-to-noise advantages may be realized using the rapid and broadband scanning features of this system in many areas of spectroscopy, e.g., process monitoring and control, reaction dynamics, and remote sensing (e.g., greenhouse gas monitoring, biological/chemical agent screening).

The invention relates to the technical field of fiber sensing, and especially to a pre-pumped pulse and Gray code based BOTDA instrument. The BOTDA instrument comprises a narrow-linewidth semiconductor sensor, a coupler, a first erbium doped fiber amplifier, a first polarization controller, a single sideband modulator, a microwave source, an optical isolator, a sensing fiber, an optical annular device, a second erbium doped fiber amplifier, a polarization scrambler, an electro-optical intensity modulator, a second polarization controller, an arbitrary waveform generator, an optical filter, a photoelectric detector and a signal collecting and processing system. On the premise that the high spatial resolution of a BOTDA system is maintained, the BOTDA instrument ensures the sensing distance and the measuring precision of the system, and improves the sensing performance of the system.

The invention relates to the field of optical fiber sensing, specifically a phase-light time domain reflection device and method based on heterodyne detection phase demodulation. The device consists of a narrow linewidth laser, an optical fiber coupler with a coupling model of 1*2, a polarization controller, a sound-light modulator, an erbium-doped optical fiber amplifier, a narrow-band optical fiber filter, a first variable optical attenuator, a three-port circulator, a sensing optical fiber, an optical fiber coupler with a coupling model of 2*1, a photoelectric detector, a signal collection and processing module, an arbitrary waveform generator, a power amplifier, and a second variable optical attenuator. The device and method enable the heterodyne detection phase demodulation to be combined together, achieve external vibration sensing through direct phase demodulation, and are higher in sensitivity. In addition, the device and method employ a brand new direct phase modulation method to sense the external vibration, so the positioning method, compared with a conventional method, of each vibrating point is different.

An integrated circuit (IC) tester includes a separate arbitrary waveform generator (AWG) for each input terminal of an IC to be tested. Each AWG generates a test signal input to the IC terminal that linearly ramps between discrete levels to approximate a smoothly varying waveform. Each AWG includes a digital-to-analog converter (DAC) formed by a set of N ramp generators, with each ramp generator producing output currents that ramp at adjustable rates between discrete levels in response to a change in state of an input waveform data bit. The output currents of all N ramp generators of the DAC, which have separately weighted magnitude levels, are summed and converted to a proportional voltage to produce the AWG's test signal.

The invention discloses a device for compensating a non-linear damage of optical fiber, belongs to an optical fiber communication device, solves the problem of limitation on transmission speed rate or higher complexity of the conventional restraint device, and guarantees the transmission speed rate of an optical fiber system during compensation of the non-linear damage of the optical fiber. The device comprises an arbitrary waveform generator, a driving amplifier, a first electro-optical phase modulator, a dispersion medium and a second electro-optical phase modulator, wherein a clock signal is input to a trigger end of the arbitrary waveform generator; the arbitrary waveform generator outputs a periodic parabola type waveform signal, and the periodic parabola type waveform signal is amplified by using the driving amplifier into an electric driving signal and sent to driving ends of the first electro-optical phase modulator and the second electro-optical phase modulator at the same time; an optical transmitter outputs a data signal to an input end of the first electro-optical phase modulator; and an output end of the second electro-optical phase modulator is connected with an optical fiber link. The invention has the advantages that: an adopted optical device is simple; the bit error rate of signal receiving reaches 10<-7> to 10<-9>; optical power cost is reduced by about 3 dB; and the device is applicable to a long-distance high-capacity and ultra-high-speed optical fiber communication system of all kinds of modulation formats and transmission speed rate.

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) and a data acquisition system (DAS) that monitors the status of the DUT/CUT. The AWG and DAS connect to the DUT/CUT through a feedback loop where the AWG outputs the test waveform to the DUT/CUT, the DAS monitors the DUT/CUT parameters, and the DAS analyzes and communicates changes to the AWG to effect changes in the output waveform, when desired. The AWG builds the output waveform in small slices (or segments) that are assembled together through a process of selection and calibration. The feedback architecture facilitates a number of changes in the output waveform, including a change in the original order of the preassembled slices, and changes in the magnitude/shape of the output waveform.

Jitterless transition of the programmable clock waveform is generated employing a set of two coupled direct digital synthesis (DDS) circuits. The first phase accumulator in the first DDS circuit runs at least one cycle of a common reference clock for the DDS circuits ahead of the second phase accumulator in the second DDS circuit. As a phase transition through the beginning of a phase cycle is detected from the first phase accumulator, a first phase offset word and a second phase offset word for the first and second phase accumulators are calculated and loaded into the first and second DDS circuits. The programmable clock waveform is employed as a clock input for the RAM address controller. A well defined jitterless transition in frequency of the arbitrary waveform is provided which coincides with the beginning of the phase cycle of the DDS output signal from the second DDS circuit.

A system based on envelope microvesicle for perfusion imaging and ultrasonic controlled release is composed of ultrasonic imaging probe, fully digitalized ultrasonography B, RF data output port, high-speed data acquisition card, PC as main controller, any waveform generator, 3D moving unit, moving controller and single-cell transducer. On the basis of fully digitalized ultrasonography B, a blood perfusion imaging algorithm is used for making a decision to obtained original RF data and performing real-time imaging. Under the guide of perfusion image, the release of envelope microvesicles is controlled.

The invention discloses an ultrasonic guided wave device for detecting a defect at the rail bottom of a steel rail at a long distance, which comprises a computer, a data acquisition card, a detection signal amplifier, an arbitrary waveform generator, a power amplifier, a change-over switch and a guided wave array probe. The ultrasonic guided wave device is characterized in that: the computer serves as a control center of the device, and controls the arbitrary waveform generator to generate a single-audio frequency signal of which central frequency is selected detection frequency; the single-audio frequency signal is transmitted to the guided wave array probe after passing through the power amplifier to excite guided waves of a vertical bending mode in the rail bottom of the steel rail; and under the regulation and control of the change-over switch, the guided wave array probe receives a defect reflection echo signal which is transmitted to the computer for processing and display after passing through the detection signal amplifier and the data acquisition card. The ultrasonic guided wave device realizes the rapid nondestructive detection of the defect at the rail bottom of the steel rail.

The invention relates to the field of signal generator, and specifically relates to an arbitrary waveform generator based on a PXIe bus. The generator comprises a waveform generation part and a waveform conditioning part. The waveform generation part comprises an FPGA and a crystal oscillator. The waveform conditioning part comprises a 16-bit DAC, an operational amplifier, an SPI program control amplifier, a filter circuit, an SPI program control DAC, a differential operational amplifier, and a subtracter. The generator employs the PXIe bus as a channel which is used by an upper computer for transmitting waveform data. The FPGA continuously process the waveform data transmitted by the upper computer in a waveform generation process, so as to guarantee the integrity of high-frequency signal quality. In a waveform conditioning process, the generator respectively employs a Bessel filter and an elliptic filter according to the frequency characteristics of signals and the difference of anti-noise capabilities, and meets the filtering requirements of different types of signals. For a signal with the amplitude being less than 50mV, a small signal processing branch circuit is designed, thereby guaranteeing that a signal with a small amplitude value cannot be flooded by noise. The generator employs a mode of internal and external synchronization adjustment for signal amplitude and bias, and guarantees the accuracy of a signal.

An Arbitrary Waveform Generator has a controller programmed to generate a sequence of test waveforms using previously-defined waveform data files. The controller generates this series of test waveforms by direct synthesis to cause said each waveform to contain a respective different predetermined amount of Rj, Sj and ISI jitter components. In this way, the Arbitrary Waveform Generator produces a sequence of waveforms incorporating varying amounts of ISI to sweep said ISI jitter components from a an initial amount of ISI, for example, zero ISI, and continually increment said amount of ISI to a full unit interval of ISI in predetermined increments, for example, 0.1 UI steps.

The present invention provides an apparatus and a method for generating and applying an electric field according to a user configured arbitrary waveform pulsing train. A control module allows the user to input operation parameters and configure the arbitrary waveform pulsing train for the electroporation process. A micro-controller unit coupled to the control module controls an arbitrary waveform generator unit and a customized power module. During the electroporation process, the arbitrary waveform generator unit produces the arbitrary waveform pulsing train that is amplified by the customized power module. The customized power module is coupled to at least two electrodes, wherein the at least two electrodes will produce an electric field across a target media.