The Experts below are selected from a list of 1674 Experts worldwide ranked by ideXlab platform

H E Zhiqiang - One of the best experts on this subject based on the ideXlab platform.

  • design of Digital Storage Oscilloscope based on dsp
    Hebei Journal of Industrial Science and Technology, 2012
    Co-Authors: H E Zhiqiang
    Abstract:

    A Digital Storage Oscilloscope was designed based on DSP and FPGA chip.It consists of the power supply,front-end data acquisition,the FPGA chip control module,interface controller,SDRAM and FLASH Storage systems,DSP chip control module,keyboard and LCD display modules and other components.It has 200 MS/s real-time sampling rate and 40 MHz analog bandwidth dual-channel data acquisition function.

  • design and implement of the Digital Storage Oscilloscope card based on vhdl
    IEEE International Conference on Electronic Measurement & Instruments, 2011
    Co-Authors: H E Zhiqiang, Feng Guonan, Zhang Jingzhi
    Abstract:

    This paper discusses the chief techniques and design principles of a Digital Storage Oscilloscope card based on VHDL, which takes full advantage of high-speed data acquisition technology. FPGA is adopted as the kernel controller, and VHDL design method is utilized to achieve the global logic control. The instrument consists of pre-process circuit, acquisition circuit and FPGA and so on. The test result indicates that the system works stably and the design is successful.

  • the Digital Storage Oscilloscope card based on parallel multi channel data acquisition architecture
    Journal of the Hebei Academy of Sciences, 2011
    Co-Authors: H E Zhiqiang
    Abstract:

    The high-speed data acqu isition technology and method are deeply reseacged.The 4-ch annel parallel data acquisition arch itecture is proposed based on VHDL.The low-speed,low-cost analog/Digital con version devices are adopted to realized the 400MSa/s high-speed data acquisition.The designe d Digital Storage Oscilloscope card has shown high-speed,large capacity data ac quisition and Oscilloscope functions.

  • research in embedded Digital Storage Oscilloscope based on pxa 270
    Hebei Journal of Industrial Science and Technology, 2010
    Co-Authors: H E Zhiqiang
    Abstract:

    This paper discusses the chief techniques and design principles of an embedded Digital Storage Oscilloscope based on PXA 270,using FPGA as logic controller cell.The data acquisition partition consists of pre-process circuit,A/D converter,on-board memories,control circuit integrated in FPGA.In the PB and EVC development environment,developers realized the part of embedded software.Actual test shows that the highest real-time sampling rate of the Oscilloscope is up to 1 GHz/s,which meets the design requirements.

  • an embedded virtual Digital Storage Oscilloscope with 1gsps
    International Conference on Electronic Measurement and Instruments, 2007
    Co-Authors: H E Zhiqiang, Zeng Wenxian, Li Jianke
    Abstract:

    This paper discusses the chief techniques and design principles of an embedded virtual Digital Storage Oscilloscope, which have two working mode: Oscilloscope and data acquisition. The instrument consists of pre-process circuit, A/D converter, on-board memories, high-speed clock generator and control circuit integrated in FPGA. It can concatenate embedded CPU main board through PC/104 bus, and also can achieve 8-bit resolution allowing up to 1 GHz sampling rate with 256KByte/channel on-board real-time memory.

Kuojun Yang - One of the best experts on this subject based on the ideXlab platform.

  • timing skew calibration method for tiadc based 20 gsps Digital Storage Oscilloscope
    Journal of Circuits Systems and Computers, 2016
    Co-Authors: Kuojun Yang, Shulin Tian, Wuhuang Huang, Peng Ye
    Abstract:

    Time-interleaved technique is widely used to increase the sampling rate of analog-to-Digital converter (ADC). However, the channel mismatches degrade the performance of time-interleaved ADC (TIADC). When input signal frequency is very high, timing skews have significant effect on distortion. Therefore, a new timing skew calibration method is proposed in this paper. This method is based on the truth that timing skews are related to the product of the outputs of sub-ADCs. After timing skews are estimated, the Digital controlled delay elements (DCDE) in ADC and phase locked loop (PLL) are utilized to calibrate timing skews. No auxiliary circuit and Digital filter are needed for this calibration method. Simulation results show that the proposed method can estimate timing skew accurately. It is also proved that an accurate estimation can be obtained even the signal to noise ratio (SNR) of input signal is 20dB. The proposed method is employed to calibrate timing skews in a 16-channel TIADC-based 20GSPS Digital Storage Oscilloscope (DSO). The experiment results demonstrate the usefulness of the proposed method. We can see that after timing skews are calibrated, the spectrum spurs have been effectively eliminated.

  • Timing Skew Calibration Method for TIADC-Based 20 GSPS Digital Storage Oscilloscope
    Journal of Circuits Systems and Computers, 2015
    Co-Authors: Kuojun Yang, Shulin Tian, Wuhuang Huang, Peng Ye
    Abstract:

    Time-interleaved technique is widely used to increase the sampling rate of analog-to-Digital converter (ADC). However, the channel mismatches degrade the performance of time-interleaved ADC (TIADC). When input signal frequency is very high, timing skews have significant effect on distortion. Therefore, a new timing skew calibration method is proposed in this paper. This method is based on the truth that timing skews are related to the product of the outputs of sub-ADCs. After timing skews are estimated, the Digital controlled delay elements (DCDE) in ADC and phase locked loop (PLL) are utilized to calibrate timing skews. No auxiliary circuit and Digital filter are needed for this calibration method. Simulation results show that the proposed method can estimate timing skew accurately. It is also proved that an accurate estimation can be obtained even the signal to noise ratio (SNR) of input signal is 20[Formula: see text]dB. The proposed method is employed to calibrate timing skews in a 16-channel TIADC-based 20[Formula: see text]GSPS Digital Storage Oscilloscope (DSO). The experiment results demonstrate the usefulness of the proposed method. We can see that after timing skews are calibrated, the spectrum spurs have been effectively eliminated.

  • information entropy and average based high resolution Digital Storage Oscilloscope
    Mathematical Problems in Engineering, 2014
    Co-Authors: Jun Jiang, Kuojun Yang
    Abstract:

    Vertical resolution is an essential indicator of Digital Storage Oscilloscope (DSO) and the key to improving resolution is to increase Digitalizing bits and lower noise. Averaging is a typical method to improve signal to noise ratio (SNR) and the effective number of bits (ENOB). The existing averaging algorithm is apt to be restricted by the repetitiveness of signal and be influenced by gross error in quantization, and therefore its effect on restricting noise and improving resolution is limited. An information entropy-based data fusion and average-based decimation filtering algorithm, proceeding from improving average algorithm and in combination with relevant theories of information entropy, are proposed in this paper to improve the resolution of Oscilloscope. For single acquiring signal, resolution is improved through eliminating gross error in quantization by utilizing the maximum entropy of sample data with further noise filtering via average-based decimation after data fusion of efficient sample data under the premise of oversampling. No subjective assumptions and constraints are added to the signal under test in the whole process without any impact on the analog bandwidth of Oscilloscope under actual sampling rate.

  • a seamless acquisition Digital Storage Oscilloscope with three dimensional waveform display
    Review of Scientific Instruments, 2014
    Co-Authors: Kuojun Yang, Shulin Tian, Hao Zeng
    Abstract:

    In traditional Digital Storage Oscilloscope (DSO), sampled data need to be processed after each acquisition. During data processing, the acquisition is stopped and Oscilloscope is blind to the input signal. Thus, this duration is called dead time. With the rapid development of modern electronic systems, the effect of infrequent events becomes significant. To capture these occasional events in shorter time, dead time in traditional DSO that causes the loss of measured signal needs to be reduced or even eliminated. In this paper, a seamless acquisition Oscilloscope without dead time is proposed. In this Oscilloscope, three-dimensional waveform mapping (TWM) technique, which converts sampled data to displayed waveform, is proposed. With this technique, not only the process speed is improved, but also the probability information of waveform is displayed with different brightness. Thus, a three-dimensional waveform is shown to the user. To reduce processing time further, parallel TWM which processes several sa...

Peng Ye - One of the best experts on this subject based on the ideXlab platform.

  • timing skew calibration method for tiadc based 20 gsps Digital Storage Oscilloscope
    Journal of Circuits Systems and Computers, 2016
    Co-Authors: Kuojun Yang, Shulin Tian, Wuhuang Huang, Peng Ye
    Abstract:

    Time-interleaved technique is widely used to increase the sampling rate of analog-to-Digital converter (ADC). However, the channel mismatches degrade the performance of time-interleaved ADC (TIADC). When input signal frequency is very high, timing skews have significant effect on distortion. Therefore, a new timing skew calibration method is proposed in this paper. This method is based on the truth that timing skews are related to the product of the outputs of sub-ADCs. After timing skews are estimated, the Digital controlled delay elements (DCDE) in ADC and phase locked loop (PLL) are utilized to calibrate timing skews. No auxiliary circuit and Digital filter are needed for this calibration method. Simulation results show that the proposed method can estimate timing skew accurately. It is also proved that an accurate estimation can be obtained even the signal to noise ratio (SNR) of input signal is 20dB. The proposed method is employed to calibrate timing skews in a 16-channel TIADC-based 20GSPS Digital Storage Oscilloscope (DSO). The experiment results demonstrate the usefulness of the proposed method. We can see that after timing skews are calibrated, the spectrum spurs have been effectively eliminated.

  • Timing Skew Calibration Method for TIADC-Based 20 GSPS Digital Storage Oscilloscope
    Journal of Circuits Systems and Computers, 2015
    Co-Authors: Kuojun Yang, Shulin Tian, Wuhuang Huang, Peng Ye
    Abstract:

    Time-interleaved technique is widely used to increase the sampling rate of analog-to-Digital converter (ADC). However, the channel mismatches degrade the performance of time-interleaved ADC (TIADC). When input signal frequency is very high, timing skews have significant effect on distortion. Therefore, a new timing skew calibration method is proposed in this paper. This method is based on the truth that timing skews are related to the product of the outputs of sub-ADCs. After timing skews are estimated, the Digital controlled delay elements (DCDE) in ADC and phase locked loop (PLL) are utilized to calibrate timing skews. No auxiliary circuit and Digital filter are needed for this calibration method. Simulation results show that the proposed method can estimate timing skew accurately. It is also proved that an accurate estimation can be obtained even the signal to noise ratio (SNR) of input signal is 20[Formula: see text]dB. The proposed method is employed to calibrate timing skews in a 16-channel TIADC-based 20[Formula: see text]GSPS Digital Storage Oscilloscope (DSO). The experiment results demonstrate the usefulness of the proposed method. We can see that after timing skews are calibrated, the spectrum spurs have been effectively eliminated.

K R Karsch - One of the best experts on this subject based on the ideXlab platform.

  • Occurrence, extent, and implications of pressure waves during excimer laser ablation of normal arterial wall and atherosclerotic plaque
    Lasers in Surgery and Medicine, 1993
    Co-Authors: K K Haase, Hartmut Hanke, Andreas Baumbach, Stefan Hassenstein, Stefan Duda, Carsten Rose, Waldemar von M??nch, M. Wehrmann, K R Karsch
    Abstract:

    Ablation of atherosclerotic plaque and normal arterial wall was performed using a Xenon-Chloride Excimer laser with a wave-length of 308 nm and a pulse duration of 115 ns. The light was transmitted via a 600 microns bare fibre and adjusted to an energy density of 3.5J/cm2. The acoustic signals generated by the laser pulse were measured with two types of hydrophones consisting of polyvinylidenefluoride with active diameters of 0.3 mm and 0.5 mm and recorded on a dual channel Digital Storage Oscilloscope using either a 0.5 m coaxial cable or a broadband fibre-optic transmission system. Tissue was retrieved from nine cadaver human aortas and macroscopically classified as either normal or calcified atherosclerotic plaque. Histological analysis (Haematoxylin eosin, elastica van Gieson, and immunohistochemical staining) was carried out after the experiments to verify the macroscopic diagnosis and to correlate the acoustic responses with the tissue characteristics. For normal arterial wall, maximum peak pressure was 1.28 MPa +/- 0.85 MPa, rise time 163 ns +/- 43 ns, and pressure increase 8.2k Pa +/- 5.4k Pa/ns. For calcified, atheromatous segments, a maximum peak pressure of 2.02 MPa +/- 1.16 MPa, a rise time of 69.9 ns +/- 25.8 ns, and a pressure increase of 32.3 kPa +/- 21.3 kPa/ns was found. Statistical analysis showed a significant shorter rise time (P < 0.0001) and a higher pressure increase (P < 0.0001) for calcified tissue in comparison to normal arterial wall, whereas maximum pressures alone did not allow a differentiation of tissue characteristics. Several hundred kPa are generated during Excimer laser ablation.(ABSTRACT TRUNCATED AT 250 WORDS)

  • [In vitro studies of shock wave effects during ablation of normal and atherosclerotic vascular wall by excimer laser].
    Zeitschrift fur Kardiologie, 1993
    Co-Authors: K K Haase, Hartmut Hanke, Andreas Baumbach, Carsten Rose, M. Wehrmann, K R Karsch
    Abstract:

    Ablation of atherosclerotic plaque and normal arterial wall was performed using a xenon-chloride-excimer laser with a wavelength of 308 nm and a pulse duration of 115 ns. The light was transmitted via a 600 micron fiber and adjusted to an energy density of 3.5 J/cm2. The acoustic signals generated by the laser pulse were measured with hydrophones consisting of polyvinylidenefluoride with active diameters of 0.3 mm and recorded on a dual-channel Digital Storage Oscilloscope using either a 0.5 m coaxial cable or a broadband transmission system. From 19 cadavers human aortic tissue segments were excised and macroscopically classified as either normal or calcified atherosclerotic plaque. Approximately 500 measurements were performed in saline and blood each. Histological analysis was carried out after the experiments to verify the macroscopic diagnosis and to correlate the acoustic responses with the tissue characteristics. For "normal" arterial segments, maximum peak pressure was 1.25 MPa +/- 0.85 MPa, rise time 163 ns +/- 43 ns, and pressure increase 8.2 kPa +/- 5.4 kPa/ns in saline. For calcified, atheromatous segments a significantly higher maximum pressure (2.20 MPa +/- 1.16 MPa), a significantly shorter rise time (69.9 ns +/- 25.8 ns), and a significantly higher pressure increase (32.3 kPa +/- 21.3 kPa/ns) was found in saline (p < or = 0.0001). In blood, maximum peak pressure was 1.29 MPa +/- 0.43 MPa, rise time 93.3 ns +/- 27.7 ns, and pressure increase 14.6 kPa +/- 5.2 kPa/ns for "normal" arterial segments. Maximum peak pressure (2.28 MPa +/- 0.63 MPa) and pressure increase (32.8 kPa +/- Pa/ns) were significantly higher for calcified tissue segments.(ABSTRACT TRUNCATED AT 250 WORDS)

Steven Hinckley - One of the best experts on this subject based on the ideXlab platform.

  • Low cost educational video for first year undergraduate students using Oscilloscopes
    2013
    Co-Authors: Daniel Oswald, Steven Hinckley, Graham Wild
    Abstract:

    In this paper, we report the development and application of a multimedia resource designed to complement learning activities in undergraduate engineering and physics laboratories on the setup and operation of a Digital Storage Oscilloscope. The development and design of this resource was kept as simple as possible. Cognitive load theory, in which the learning tool was designed to minimise extraneous cognitive load in students, was used as the guiding design framework. This resource has demonstrated a significant improvement in students’ understanding and confidence in the use of the Digital Storage Oscilloscope and associated test equipment. Student feedback has indicated areas of improvement required, such as in text-to-speech quality.

  • improving engineering students skills using a Digital Storage Oscilloscope using multimedia resources
    23rd Annual Conference of the Australasian Association for Engineering Education 2012: Profession of Engineering Education: Advancing Teaching Researc, 2012
    Co-Authors: Daniel Oswald, Desmond Baccini, Steven Hinckley, Graham Wild
    Abstract:

    Currently, students at Edith Cowan University (ECU) studying engineering utilise a laboratory worksheet with written instructions to follow in all experiments. This can be restrictive as most laboratory sessions are limited by time and the written instructions can be misinterpreted by some students. To overcome this issue, a multimedia presentation was developed to reduce the workload of students during the pre-laboratory phase and the burden on the laboratory demonstrators during laboratory session. Our verbal feedback, from laboratory demonstrators, is that students have traditionally struggled with the basic usage of the Digital Storage Oscilloscope (DSO). A video tutorial has been created with the primary purpose for utilisation in first year engineering courses at ECU where students have the most difficulty, and reusability in later years when students need to review their knowledge and skills.

  • Developing an Educational Video for Utilising an Oscilloscope in First Year Physics
    2012
    Co-Authors: Daniel Oswald, Graham Wild, Steven Hinckley
    Abstract:

    We report the development of a multimedia resource designed to aid undergraduate engineering and physics students in learning the operation and functions of a Digital Storage Oscilloscope.

  • AC Electricity Experiments for Off-Campus Teaching and Learning
    2010
    Co-Authors: Graham Wild, Geoffrey Swan, Steven Hinckley
    Abstract:

    Summary We demonstrate the implementation of a computer based Digital Storage Oscilloscope and Function Generator, using the computer’s sound card, for the off-campus teaching and learning of AC electronics experiments. Keywords-AC electricity; distance education; education; offcampus delivery; teaching and learning