摘要:
正 一 當被測量的物理量正比于某一非周期三角形脈沖的峰值時,為了讀取被測量值,通常采用二極管峰值保持電路。非周期的三角形電壓脈沖,記為u1(t),如圖1所示。Um是脈沖的幅值,t1和t2分別是脈沖的前沿和后沿寬度,1和2是脈沖前沿和后沿的斜率,那么 1=Um/t1,2=Um/t2。 常用的二極管峰值保持電路,如圖2所示,圖中BG1是射極跟隨器,D是開關二極管,C是存儲電容器,BG2是源極跟隨器。為了便于分析,用R0表示前級的輸出阻抗
Abstract:
When an input signal is a non-periodic triangular pulse, an analysis is made of the relation between the input and the output signals. On the basis of the analysis, calculations are made of the trapping time, trapping error and attenuation of the output signal.The non-linear characteristic of the diode is considered according to two different conditions, in the case where the volt-ampere characteristic can be represented in exponential form. The author proposes an iteration form to solve the intermediate region of the two conditions.
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