Designing leading-edge systems (e.g., communication systems) requires knowledge about the technological limits. Jitter is the limiting effect in wideband ADCs with a digitization bandwidth between 1 MHz and 1 GHz. The effects of aperture jitter and clock jitter have been investigated previously. However, some very important aspects are still missing, in particular investigations on the spectral distribution of the jitter induced error. This gap is filled by this article.