I've have some cascaded op-amp stages, each providing +20dB, and worst case DC offset is +-30mV at the output of each stage.
I want to AC couple each amplifier stage with polarized capacitors. I cannot find any documentation recommending the use of polarized capacitors for continuous reversed bias, even when the bias is very small (< 50mV).
However there is the following PDF from kyocera,
basically saying tantalums should never be designed in circuits where a continuous reverse bias exists and since they fail to present a definition of revers biased I find it hard to believe a microvolt is going to do harm them. So whats the truth about using tantalum's in such applications ?