Method and apparatus for simultaneous processing of multiple functions
Electronic logic gates that operate using N logic state levels, where N is greater than 2, and methods of operating such gates. The electronic logic gates operate according to truth tables. At least two input signals each having a logic state that can range over more than two logic states are provided to the logic gates. The logic gates each provide an output signal that can have one of N logic states. Examples of gates described include NAND/NAND gates having two inputs A and B and NAND/NAND gates having three inputs A, B, and C, where A, B and C can take any of four logic states. Systems using such gates are described, and their operation illustrated. Optical logic gates that operate using N logic state levels are also described.
1. A logic gate comprising:
a decoder;
a plurality of Boolean gates; and
an encoder;
where the logic gate:
determines a logic level selected from at least three input logic levels based on a first voltage scale of a received input signal using the decoder;
determines a Boolean output by transmitting the logic level through the plurality of Boolean gates; and
determines an output logic level selected from at least three output logic levels based on a second voltage scale using the Boolean output transmitted to the encoder.
2. The logic gate of claim 1 , wherein the decoder decodes the logic level into a set of binary values.
3. The logic gate of claim 1 , wherein the first voltage scale is the same as the second voltage scale.
4. The logic gate of claim 1 , wherein the first voltage scale is not the same as the second voltage scale.
5. The logic gate of claim 1 , wherein the first voltage scale is a sequence of monotonically increasing voltage levels.
6. The logic gate of claim 1 , wherein the first voltage scale is a sequence of equally spaced voltage levels.
7. The logic gate of claim 1 , wherein the second voltage scale is a sequence of monotonically increasing voltage levels.
8. The logic gate of claim 1 , wherein the second voltage scale is a sequence of equally spaced voltage levels.
9. The logic gate of claim 1 , wherein the at least three input logic levels have four states.
10. The logic gate of claim 1 , wherein the Boolean gates simultaneously determine the Boolean output.
11. The logic gate of claim 1 , wherein the logic levels are transmitted to the plurality of Boolean gates on a plurality of separate channels.
12. The logic gate of claim 11 , wherein each channel in the plurality of separate channel transmits a portion of the Boolean output to the encoder.
13. The logic gate of claim 1 , wherein the Boolean gates are selected from the group consisting of AND, OR, XOR, NAND, NOR, and NAND3.