5. a 2-bit encoder is a circuit with four input lines, exactly one of which is high at every instant, and two output lines whose 2-bit binary value tells which input is high. only one of the input lines will ever be active at the same time. you do not have to consider the cases if more than one is active. a. draw the truth table for a 2-bit encoder. there will be four input variables and two output variables. only one of the input variables can be 1 at a given time, so there are only 4 possible combinations for valid input variables. b. draw the circuit for the 2-bit encoder. c. draw the circuit for a 3-bit encoder. there will be 8 input lines and 3 output lines.