Understand_Capacitor_Soakage_to_Optimize_Analog_Systems(理解电容浸润效应--翻译版).doc

Understand Capacitor Soakage to Optimize Analog Systems(理解电容器浸润优化模拟系统Dielectric absorption can cause subtle errors in analog applications(在模拟应用中电解质吸收可能导致微妙的错误) such as those employing S/H circuits(例如使用采样保持电路), integrating ADCs (集成ADC)and active filters(和有源滤波器). But knowing how to measure this soakage(但是知道如何测量这些浸润 and compensate for it helps you minimize its effects(并且补偿它能帮助你减小它的影响).? Veteran circuit designers often got a shocking introduction to dielectric absorption (老的电路设计者对电容器浸润when supposedly discharged high-voltage oil-filled paper capacitors reached out and bit them(当很可能是高压油浸纸电容器. Indeed, the old oil-filled paper capacitors were notorious for what was once called soakage(实际上老的油浸纸电容器是因为“浸润 -- a capacitors propensity to regain some charge after removal of a momentary short(浸润. Today, you wont find very many of these capacitors in use(今天你会发现这种电容应用的不是太多), but you will still encounter soakage(但是仍然会遭遇浸润). Do you know how to deal with it??(你知道怎样解决吗？) Nowadays, youre more likely to notice the effects of dielectric absorption in some more subtle way(当今，你更可能在一些更微妙的方式下注意到电介质吸收的影响), perhaps in the performance of an integrator that cant be reset to zero(积分器表现出拒绝复位至0) or a sample/hold that refuses to work correctly(或采样保持器表现出变化不定的误差). But whether you literally feel its effects or merely observe them in a circuits behavior(但是不管你真正感受到它的影响仅仅是观察它们在电路中的, dielectric absorption is an undesirable characteristic that every capacitor possesses to some degree(电介质吸收这种不良特征每种电容或多或少都会有). This characteristic is inherent in the dielectric material itself(这种特征天生存在于电介质材料当中), although a poor manufacturing procedure (即使不良的制造工序)or inferior foil electrodes can contribute to the problem(或者劣质箔电极.? Fig 1 - A simple test fixture?lets you evaluate dielectric absorption at low speeds(一个简单的让你在低速下评估电介质吸收的测试固件). To use the one shown here(举个例子), start with all switches off and throw S1 and S2 on for 1 min(首先将所有开关打到OFF并且S1和S2打到ON一分钟); throw S1 and S2 off and wait 6 sec(S1和S2打到OFF并且等待6S), throwing S3 on dur