An efficient waveform averaging method based on FPGA in oscilloscope

In recent years, with the rapid development of the electronic information industry, the capture of high-speed signals has become a hot issue in the field of time domain testing. As a universal test instrument, oscilloscopes are widely used in various industries. In order to eliminate the noise superimposed on the input signal, the average capture mode is added to the digital oscilloscope. This mode averages the acquired multiple waveforms to make the waveform smoother. At present, the common practice needs to transmit the acquired waveform to the host computer, and the host computer performs the shift operation after the accumulation, so the average times can only be 2
ⁿ
. This method requires more storage resources and the waveform refresh rate is low. For this reason, this paper proposes an efficient waveform averaging method based on FPGA. The method performs the arithmetic operation in the FPGA, so the average times is any integer from 2 to 65536, which improves the overall performance of the oscilloscope.