
        CMOS XNOR Gate:

	The XNOR gate (sometimes ENOR, EXNOR or NXOR and pronounced as Exclusive NOR) is a digital logic gate whose function is the logical 
        complement of the Exclusive OR (XOR) gate. The two-input version implements logical equality, behaving according to the truth table
        to the right, and hence the gate is sometimes called an "equivalence gate". A high output (1) results if both of the inputs to the 
        gate are the same. If one but not both inputs are high (1), a low output (0) results.
        As part of CIRCUIT DESIGN AND SIMULATION MARATHON USING ESIM,the task was mainly to design the chosen circuit using the open source 
        EDA tool called eSim. It is an integrated tool built using free/libre and open source software such as KiCad, Ngspice and GHDL.
	The add on factor here was that along with simulating the circuit using eSim,we were guided in using the SkyWater 130nm PDK to 
        analyze the result of design. We first started with learning DAC IP IMPLEMENTATION which was a udemy course provided to us at 
        free of cost. The course had in-dept concepts which clarified most of our doubts regarding implementation and use of SkyWater 130.
        After that we started with implementing our circuit on eSim followed by converting the netlist into SkyWater 130.The final aim was
        to get the desired output. Initially some of the problems were faced while implementing circuit.Some of the common problems were 
        basically small errors generated due to some common reasons such as improper connections of ports and creating wrong directories.
        The main challange was to convert the eSim netlist to SkyWater 130.To get the desired output,some of the circuit components and 
        their values were supposed to be rearranged. Finally after referring some resources and with a great support of faculties ,guides 
        and students on slack,I was able to successfully complete the task.
	