Abstract
Abstract In an ideal photo-diode, with external reverse bias, the low frequency impedance presented to the photo-current generator (representing amplitude-modulated incident light) is very high, approaching infinity for moderate reverse voltages ; however, this is not the case for a self-biased photo-diode. It is shown that the low frequency impedance of a photo-diode, self-biased by an r.f. pump, is of the order of the forward resistance of the diode and may become equal to the forward resistance in certain oases. The results are of interest for any photo-parametric circuit in which one is concerned with the low frequency signal impedance
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