There are usually three methods of bandwidth for high - end oscilloscopes
One is the direct realization of preamplifier circuit; Second, DSP is used to stretch bandwidth; Third, digital bandwidth reuse.
According to tek, each of the three approaches has its own advantages. At present, preamplifier direct implementation and DSP stretch bandwidth technology are widely used in the market. From the perspective of use, the bandwidth of hardware implementation USES less digital technology, with high signal fidelity, more flexible in use, less restrictions, flatter frequency response and noise spectrum, support equivalent sampling and undersampling, and allow signal beyond the screen, but the cost is relatively high. In contrast, digital technology may cause fluctuation of frequency response or noise spectrum, with low effective bit at some frequencies. Meanwhile, digital technology requires real-time sampling, does not support under-sampling, and waveform distortion will occur when the signal goes beyond the screen, which has relatively high restrictions and higher requirements on users. But the bandwidth achieved by digital technology is relatively cheap due to the low cost of hardware, providing a cheap solution for users at the expense of some performance.In general, preamplifier technology and DSP provide different options for different customers.