| 摘要 |
An analog signal having a value A is converted into an n-bit digital signal. An optical calculation part performs a part of a calculation shown below for an A/D conversion as below. Ui=[{{ SIGMA (WijxXj)+hi}xV}+A]xSi . . .(1) The calculation of the equation (1) is performed for i=0, 1, . . . , n-1 respectively; the Wij is 0 if i>/=j>/=0, or -(2**j) if j>i>/=0; hi is -(2**i), or -{(2**i)- epsilon }(¦ epsilon ¦</=1); V and Si respectively have any desired positive values and the said SIGMA represents a summation of each expression following thereto for j=0, 1, . . . , n-1. The thresholding compares the result Ui of the calculation of each equation (1) to a threshold value, and then 1 or 0 is selected. The result of the selection is then assigned to Xi. The calculation of the equation (1) is then performed repeatedly until Xi converge on solutions. The solution of each Xi is then provided as digital values of the n-bit digital signal.
|
