The comparator is basically a 1 bit analog to digital converter.
													
																	Design 1 bit comparator circuit. 
									
	
		
	
																	The logic circuit of a 2 bit comparator how to design a 4 bit comparator. 
																	A comparator is shown as figure 2 1. 
																	Consider one bit number a and b trust table is shown below. 
																	We will compare each bit of the two 4 bit numbers and based on that comparison and the weight of their positions we will draft a truth table. 
															
													
									
	
		
	
																	2 logic design for 4 bit comparator 2 1 logic design procedure magnitude comparator is a combinational circuit that compares to numbers and determines their relative magnitude. 
																	In general a comparator is a device which compares two currents or voltages and produces the digital output based on the comparison. 
																	So we will do things a bit differently here. 
																	For a comparator circuit a high gain amplifier is needed so that even small changes on the input result in the output level firmly switching. 
															
													
									
	
		
	
																	We logically design a circuit for which we will have two inputs one for a and other for b and have three output terminals one for a b condition one for a b condition and one for a. 
																	The output of comparator is usually 3 binary variables indicating. 
																	Circuits that compare two voltages and give a digital output dependent upon the comparison of the two voltages are often used within electronic circuit design. 
																	The truth table for a 4 bit comparator would have 4 4 256 rows.