CCD Analog and digital correlators
US4267580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Jan 8, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06G7/1907
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A charge-coupled device (CCD) analog and digital correlator comprises identical modules, each of which is a simple analog CCD correlator with digital input and output. Circuits are included: PA1 (1) for injecting charges proportional to the voltage sequences s(n) and r(n), where s(n) refers to the input signal, and r(n) relates to a reference signal, against which the input signal is correlated; PA1 (2) for non-destructively sensing and tapping each sample s(n) and r(n); PA1 (3) for forming the summation s(n)+r(n); PA1 (4) and finally for squaring s(n), r(n), and [s(n)+r(n)] in simple, floating gate MOSFET amplifiers. The amplifiers operate in their saturation region, and have outputs proportional to s.sup.2 (n), r.sup.2 (n), and [s(n)+r(n)].sup.2, which are then fed into a differential amplifier to produce s(n)r(n).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.