Non-destructive charge transfer device differencing circuit
US4239983A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1979 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Mar 9, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D44/478
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A circuit is disclosed for obtaining a quantity of electrical charge carriers equal to and representative of the algebraic difference between the values of two original quantities of electrical charge carriers. The circuit includes two charge coupled device input shift registers. Each of the two shift registers incorporates at least three potential well electrodes and interposed transfer electrodes such that charge packets can be shifted from well to well. One potential well in each of the two shift registers is operated in a floating gate electrode mode, and the two potential wells are connected at a common node which services as the input to a third or output charge coupled device shift register. The two original quantities of electrical charge carriers are represented respectively in each of the two input shift registers by a pair of spatially separated charge packets which when sensed by sequencing them into and out of the potential well under the floating gate electrode provide the algebraic value of the associated quantity of electrical charge carriers. By representing each original charge quantity by two spatially separated pairs of charge packets, positive and negative alge…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.