Features of 1DPO
Digital phosphor oscilloscope DPO (DigitalphosphorOscilloscopes) is a new oscilloscope platform introduced by Tektronix. It has various traditional advantages of digital storage oscilloscope DSO (DigitalStorageOscilloscopes). From data storage to advanced triggering functions, everything is available. At the same time, it It also has the bright and dark display and real-time characteristics of the analog real-time oscilloscope ART (Analyzed Real Time), which can produce a chemical fluorescence effect in digital form that is superior to the gradual change in brightness of the analog oscilloscope CRT (CathodeRayTube).
DPO has a new breakthrough in oscilloscope technology, which can display, store and analyze complex signals in real time, and fully display the signal by using three-dimensional information (amplitude, time and multi-level brightness, and displaying the frequency of amplitude components with different brightness). The characteristics of the digital fluorescence technology, especially the use of multi-level brightness or color, can show the history of signal changes over a long period of time.
DSO's automatic measurement and waveform storage functions have amazed many engineers, but it was soon discovered that when DSO measures high-frequency signals with low-frequency modulation, it can't overcome the problem of aliasing distortion due to its insurmountable aliasing distortion. Reminiscent of the benefits of ART oscilloscope.
DPO not only has the real-time brightness and darkness without aliasing display capability of the ART oscilloscope, but also has the automatic measurement and waveform storage functions of DSO. There is still a great improvement in avoiding the shortcomings of the two. Mainly manifested in:
(1) Fast waveform capture rate and super display capability
The application of digital fluorescent display technology enables DPO to display multiple images of signals simultaneously in different grayscales or colors. The DPO can record 200,000 waveforms per second, and its signal data is 1000 times more than that of the general DSO. It can capture 500,000 waveforms at a time. This fast waveform capture rate combined with superb display capabilities enables DPO to analyze any details of the signal. .
(2) Continuous high-speed sampling capability
Usually DSO has a dead time of 8ms between the two waveforms due to the processing of the display data. Even the DSO with instavuTM sampling technology can only be reduced to 1.7μs, and the ART oscilloscope cannot capture the waveform information during the retrace time. DPO can continuously sample hundreds of thousands of waveforms at the highest sampling rate, which overcomes the stagnation of other oscilloscopes. The sampling rate of DPO is generally several 109 times per second. Such a high sampling rate allows the oscilloscope to have a larger bandwidth.
How 2DPO works
The principle block diagram of a digital fluorescent oscilloscope is shown in Figure 1. The core component is a DPX wave imaging processor composed of an application specific integrated circuit (ASIC).
Like the DSO, the input signal is first amplified and A / D converted to obtain the sampled value of the signal. The sampled value is processed by the DPX waveform imaging processor to form a complete streamer waveform diagram with 500 * 200 pixels and containing waveform 3D information In the case of an uninterrupted capture process, the DPX imaging processor sends 30 waveforms to the waveform display memory every second. Under the control of the microprocessor, the acquired waveforms are obtained on the display according to the content of the display memory . Realize such a waveform display mode as "signal digitization → graphization → display". At the same time, the microprocessor performs automatic measurement and calculation functions in parallel.
Since the DPO's data acquisition and display systems operate independently, the oscilloscope can maintain the highest waveform capture rate while processing the data required for display, which means that the oscilloscope can continuously capture all details of the waveform.
DPX is composed of a data collector and a dynamic three-dimensional database called a digital phosphor. It combines the rasterization function (wave imaging) and the fast waveform capture rate together, and accumulates signal information in a 500 * 200 integer array. Each integer in the array represents a pixel in the DPO display. The different values ​​of the pixels result in different brightness or color of the display pixels. As the signal is continuously sampled, this array is constantly updated, but unlike DSO, After a display cycle (a waveform graph) is completed, the sampling value of the new display cycle does not wash out the data of the previous display cycle. If the two sampling plants have the same display point, only the duty of the corresponding array point is changed. Multiple waveforms can be displayed cumulatively. When the display points caused by multiple waveform graphs are different, the data of each point in the array is different, so the waveform display brightness is the highest, and other waveform information that occasionally appears will be displayed with a lower brightness.
During the DPO construction period, continuous sampling is performed at the maximum rate, and the minimum time interval between samples is used to send and generate a waveform diagram, like an ART oscilloscope (because DPO uses a deep three-dimensional database to store gray information, past waveform information Lost), you can observe the signal changes over a long period of time.
3DPO application
The powerful DPO can complete the capture, display, and analysis of complex signals, plus the flexible corner hair style and automatic digital measurement function make it a leader in the field of measurement. The commonly used sampling rate of TDS3000 series is 1.25-5GS / s, the bandwidth is 100 ～ 500MHz, the sampling rate of TDS500 / 700 series is 2 ～ 4GS / s, and the bandwidth is 0.5 ～ 2GHz. DPO has such superior performance, of course not Low prices. In order to give full play to the performance of DPO, it is mainly used for the detection of complex signal bombs.
(1) Signal detection in video application environment
This type of measurement field is faced with a long "frame signal" composed of fast pulses. In order to capture the entire signal envelope, DSO can only use a slower sampling rate. The slower sampling rate will be generated due to the lack of waveform data. Aliasing distortion: ART oscilloscope can display wave profile, but does not have measurement and analysis functions, DPO is particularly suitable for the detection of such signals. Similar signals are read signals from magnetic disks, optical disks, etc.
(2) Detection of complex digital modulation signals in wireless communication equipment
The complexity of this type of signal is expressed as a non-periodic signal. Only an unrecognizable vague light band can be obtained on the ART oscilloscope. DSO is difficult to provide valuable information due to the limited storage depth. Amplitude capture capability.
(3) Detection of repetition frequency of rare events
This is the outstanding performance brought by DPO's digital fluorescence technology. By observing the display brightness of rare events in multiple waveforms, we can know the frequency of occurrence within a certain period of time, and even directly call up the waveform data in the three-dimensional database if necessary. Detailed statistics.
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