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Multiplying DAC question



		

			

									
					    chin.and
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 8, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    What is the difference between a 2 quadrant and 4 quadrant multiplying DAC? 
    
 
    From what I gather, a 2 quadrant can take a bipolar signal (provided the other input is not below 0), but only have an output above the 0V bias reference. So this means that while a DAC could have a -10 to +10V swing, the output will only be able to produce a 0 to 10V swing.
    
 
    A 4 quadrant, on the other hand, can take a bipolar signal (even with the other input negative). Also, the output is bipolar, so you can get a wave centered around 0 with the full -10V to 10V swing. Is that right?
    
									
			        
		
    

				
						
        

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 8, 2014 2:48 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      You are correct. Although in a sense, the DACs would require external components to do the 2- and 4-quadrant multiplication. Multiplying DACs are based on the concept of multipliers (please refer to MT-079 for more info.). 
      
 
      
 
      When talking about DACs, 2-quadrant multiplying operation would be literally translated to a unipolar output voltage swing while the 4-quadrant multiplying operation is referred to as bipolar output swing. Also, it is usually the reference voltage that is either positive or negative. You may be interested in AD5405 and how it could perform a 2- or 4-quadrant multiplication.
      
 
      Regards,
      
 
      Mark
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on May 8, 2014 2:48 PM
            
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      You are correct. Although in a sense, the DACs would require external components to do the 2- and 4-quadrant multiplication. Multiplying DACs are based on the concept of multipliers (please refer to MT-079 for more info.). 
      
 
      
 
      When talking about DACs, 2-quadrant multiplying operation would be literally translated to a unipolar output voltage swing while the 4-quadrant multiplying operation is referred to as bipolar output swing. Also, it is usually the reference voltage that is either positive or negative. You may be interested in AD5405 and how it could perform a 2- or 4-quadrant multiplication.
      
 
      Regards,
      
 
      Mark
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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