Stabilized charge injector for charge coupled devices with means for increasing the speed of propagation of charge carriers
US4112456A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1975 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Oct 24, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/891
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A stabilized charge injector for charge coupled devices (CCD) includes a diffusion and two or more gate structures in a CCD channel wherein the diffusion alternately acts as a source and drain of the minority-type signal carriers. D.C. signals are applied to the gates immediately adjacent the diffusion and the next successive adjacent gate to provide a charge injection which is proportional to the difference between the signal voltage applied to the one of the two gates and a DC reference voltage applied to the other thereof. Low noise performance is achieved through utilization of a quasi-static operation in which neither of the aforementioned gates adjacent the diffusion is pulsed. Moreover, the use of a gate injector presents at the input, a true capacitance defined as a function of the gate oxide layer. Hence, the value of capacitance is constant and independent of the signal voltage applied. A stabilized charge injector structure is disclosed providing a large value of capacitance for minimizing noise in the injection operation, and wherein problems otherwise arising out of the large size of the capacitance as to adequate speed of propagation of charges from the capacitance to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.