In this lab, the students will design a 4-bit adder. Multisim has the option to take one part of the circuit
as a subcircuit or module. Assembling those modules is possible to reduce the number of devices and
the complexity of the circuit. Once that a full adder subcircuit is implemented one can quickly design
and test a 4-bit adder that also can be assembled as a subcircuit. The 4-bit adder module can be used as
a basic element to design a circuit that add and subtract.
1: Implement and simulate a D flip flop in multisim, test it with 5V, ground, switches, leds etc. Show your
tests to the teacher.
2: Implement and simulate the “Full Adder” Circuit in Multisim using: J-K flip flops, AND, OR, or any gate
that be necessary. To test the full adder use 5 V, ground and switches in your input and leds in your
output for your inputs and outputs use timing diagrams. Include in your report both the circuit and
timing diagrams. Use this full adder as a subcircuit. Show these tests to the teacher.
3: Using full-adder subcircuit as a building block, design a circuit module that has two 4-bit inputs, and a
control input C. If C = 0 the output is the sum of the inputs and when C =1 the output is the difference
(see text chapter 6 and use 2’s complement to subtract). Your design requires having the flexibility to do
both addition and subtraction depending on the value of C.
Your work should include several simulation results including at least one example each of the
eight combinations (number1 (6 decimal): positive or negative; number2 (4 decimal): positive or
negative; operation: addition or subtraction) showing the correct operation of the circuit. Make a table
showing the numbers for each case and compare the theoretical the experimental results. Use 5 V,
ground and switches in your input and led in your output. Show these tests to the teacher. In your
report show the circuit with switches positioned according to the numbers in each of your examples.
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