宽带取样示波器校正中的kick-out脉冲研究

对取样示波器采用NTN校准技术中的kick-out脉冲的参数进行了分析;按照二极管时变电导的模式推导了kick-out脉冲参数的数学表达式;分析了影响kick-out脉冲的参数;提出了NTN校正技术应用的带宽范围和条件。仿真实验说明充电电容值越小,kick-out脉冲的频谱带宽越宽;二极管电感参数不对称有利于展宽频带,但增加了超调;由于选通脉冲泄漏,kick-out脉冲的频谱响应图中存在凹槽。

Study of Kick-out Pulse for Calibration of Broadband Oscilloscopes

The kick-out pulse for calibration of sampling oscilloscopes is analyzed by Nose-to-Nose (NTN) method. The mathematic expressions of kick-out pulse parameter are deduced according to diode model of time-varying conductance. The factors influencing the kick-out pulse parameter are discussed. The emulational results show that the weaker the capacity of charging capacitance is, the wider the kick-out pulse spectrum bandwidth is. The asymmetry of diode inductance parameter can widen spectrum bandwidth, but increase overshoot. For the leak of strobe pulse, there exists groove in the kick-out pulse spectral response. Finally, the paper brings forward the requirements of the frequency band and the application condition of the NTN method.