Charge-coupled multiplying digital-to-analog converter

Details Charge-coupled multiplying digital-to-analog converter Charge-coupled multiplying digital-to-analog converter

1978-04-03

1979-07-17

Ruggiero, Joseph F.

Boots, shoes, and leggings

307221D, 340347DA, 340347M, 357 24, 364862, G06J 100, H03K 1302

Patent

active

041617835

ABSTRACT:
A charge-coupled device (CCD) multiplying digital-to-analog converter mullies a bipolar analog signal, representing as a charge, by a digital word, and produces a four-quadrant analog product, also represented as a charge. An analog signal S is added to or subtracted from a bias, resulting in signals S+B and -S+B, which are converted into corresponding positive charges, Q.sub.S +Q.sub.B and -Q.sub.S +Q.sub.B, which are transferred into potential wells at X.sub.i and Y.sub.i, respectively. A digital word may be represented as b.sub.1 b.sub.2 b.sub.3 . . .b.sub.N, where N is the word length. The CCD converter comprises N parallel devices, each of which performs the function of multiplying the signal S by either 0 or 1/2.sup.i. A gate between X.sub.i and Y.sub.i is controlled by the binary bit b.sub.i. Equilibration occurs or does not occur depending on whether b.sub.i equals 0= or 1. The charges left in X.sub.i and Y.sub.i are then transferred to two other potential wells, which have channel stops diffused into them. The charges in the outer portions in each well are dumped to ground, while the remaining charges in each of the N devices are summed in a common potential well, to form a product as a sum of terms.

REFERENCES:
patent: 3956624 (1976-05-01), Audaire et al.
patent: 4032767 (1977-06-01), Lagnado
patent: 4052606 (1977-10-01), Heller et al.
patent: 4084256 (1978-04-01), Engeler et al.

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