Design and Construction of 3 x 3 Bits Programmable Logic Array (PLA) Circuit

A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logic circuits. The PLA has a set of programmable AND gate planes, which link to a set of programmable OR gate planes, which can then be conditionally complemented to produce an output. It has 2N AND gate s for N input variables and for M outputs from PLA, there should be M OR gates, each with programmable inputs from all of the AND gates. This layout allows for many logic functions to be synthesized in the sum of products canonical forms. The Programmable Logic Array (PLA) has a programmable AND array followed by a programmable OR array. Programmable Logic Array (PLA) circuit is built by using AND gates and OR gates. The 3x 4 bits data can be stored in this circuit. The large storage data bits of PLA circuit store by a using large AND-OR array with lots of inputs and product terms, and programmable connections. Programmable Logic Array circuit functions as ROM circuit.

Design and Implementation of Programmable Logic Array Using Quantum Dot Cellular Automata

Quantum Dot Cellular Automata (QCA) is an alternative to CMOS technology. The other technologies proposed by researchers are FINFET, CNTs and MTJ to reduce scalability of CMOS devices. Using Quantum Dot Cellular Automata, the low power, extremely dense circuits are designed. QCA cell is the fundamental unit in building logic gates. These cells are powered using specific clock. QCA cells are used to design basic gates and to realize Boolean expressions. QCA Designer tool is used to carry out simulations. The simulation results are same as theoretical results. The complexity and size of circuits are reduced using QCA. The paper includes design of Programmable Logic Array (PLA).