Relating wideband DSO rise time to bandwidth: Lose the 0.35!

摘要

Traditionally, oscilloscopes have exhibited a Gaussian frequency response. A Gaussian response results from the scope design's combining many circuit elements that have similar frequency responses. Analog oscilloscopes achieve their frequency response in this manner, thanks to chains of amplifiers from the input BNCs to the CRT display. (Analog oscilloscopes used the input signal to directly deflect the electron beam in a CRT. This architecture required amplifying the input signal by three orders of magnitude and driving the large ca-pacitive load that the CRT deflection plates presented.) The properties of Gaussian-response oscilloscopes are fairly well-taught and-understood throughout the industry.