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通常,大家习惯地只用正向快沿方波来检验放大器或示波器的过渡特性(包括上升时间、上冲量、阻尼等),其实,这种传统的检验方法并不十分全面。因为放大器过渡特性的好坏,它与放大器选用晶体管的导电形式,与放大器动态范围是密切相关,在选用NPN管的放大器中,如果它的工作状态选取得不适当,或输出动态范围不够,其正向快沿特性比负向快沿特性好,同样,在选用PNP管的放大器中,如果它工作状态取得不适当,或输出动态范围不够,其负
In general, it is customary to verify the transient characteristics of an amplifier or oscilloscope (including rise time, impulse, damping, etc.) only with a positive fast square wave. In fact, this traditional test method is not comprehensive. Because the transition characteristics of the amplifier is good, it and the amplifier used in the transistor conduction form, and the dynamic range of the amplifier is closely related to the selection of NPN tube amplifier, if its working conditions are not properly selected, or output dynamic range is not enough, the output dynamic range is not enough Positive fast forward characteristics along the fast than the negative good, the same, select the amplifier in the PNP tube, if it is not working properly made, or output dynamic range is not enough, the negative