6. Filtering options

Although this was largely behind the major technological efforts in favor of charge transfer devices in the 1970s, with a view to major "time-based" telephony projects, developments in this type of application came to a halt around 1985. Advances in digital technologies and the very high integration capacity achieved by electronic component technologies rendered these analog processing applications obsolete.

Based on the properties of charge sharing between two parts of the electrodes, and reading under a floating grid, it is possible to obtain the electrical result of successive weighting operations (= multiplication by a coefficient) on the information carried by the same charge packet, without affecting it, as it moves through a channel. This is a powerful process, and we'll remind you of a few figures that are still striking today, 20 years after the start of...