Digital Storage Oscilloscope Fundamentals
Digital oscilloscope is in accordance with the sampling principle, the use of A/D conversion, the continuous analogue signal into a discrete digital sequence, and then restore the reconstruction of the waveform, so as to achieve the purpose of measuring the waveform.
Input buffer amplifier (AMP) will be the input signal for buffer conversion, play the role of the measured body and oscilloscope isolation, the oscilloscope working state of the change will not affect the input signal, while the amplitude of the signal will be switched to the appropriate level of the range (the oscilloscope can handle the range), that is, different amplitude signals in the input buffer amplifier will be converted to the same voltage range of signals after the input buffer amplifier.
The role of the A/D unit is to transform the continuous analogue signal into a discrete digital sequence, and then reconstruct the waveform in accordance with the sequence of the digital sequence. So the A/D unit plays a sampling role, it is under the action of the sampling clock, the sampling pulse arrives at the moment of the magnitude of the signal amplitude is converted into a digital representation of the numerical value, this point we call the sampling point. This point is called the sampling point.A/D converter is the key component of waveform acquisition.
DEMUX (DEMUX) will be arranged in accordance with the sequence of data, that is, the A/D converter data in accordance with its analogue waveform on the successive order into the memory, that is, to arrange for the address of the data, the order of the address is the order of the sampling point in the waveform, the sampling point of the time interval between the neighbouring data is the sampling interval.
Data Acquisition Memory (Acquisition Memory) is a storage unit that stores the sampling points, and he stores the sampling data in accordance with the arranged address, and then sends it to the post-processing level when the data in the Acquisition Memory is sufficient to recover the waveform, for recovering the waveform and displaying it.
Processor (μP) and Display Memory. The processor is used to control and process all the control information, and recover the sampling points into waveform points, which are stored in the display memory area and used for display. The display unit (Display) displays the waveform points in the display memory, and the data in the display memory and the points on the LCD display panel are one-to-one correspondence.
