Products In This Thread

LTC5548 Production
The LTC5548 is a high performance, microwave double balanced passive mixer that can be used for frequency upconversion or downconversion. The device is...
Datasheet
LTC5548 on Analog.com

  • State Verified Answer
  • +1 person also asked this people also asked this
  • Replies 2 replies
  • Subscribers 68 subscribers
  • Views 529 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
LTC5548 IF current on Disabled



		

			

									
					    giomate
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 3, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    On my application , i want to increase the signal streng of IF using a Trafo... something like that:
    

    

     , On operation  would be periods, when the mixer is deactivated. Is that mean, that during disabled or PowerDown , Is--> could be (3.3V/25Ohm) ~ 130mA?
    

    So in short..is there current control or limitation  during disabled?
    

    

    i appreciate your comments sugestion or references
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Feb 8, 2022 3:14 AM
            
            
					
      
	
      

		
		
      
					
      Hi,
      

      From the schematic,
      

      I can see a cap(c1) which will be shorting Vp to ground using transformer.
      

      Also, I see you are using ADR16-6T transformer which is 1:16 core and wire transformer. Which means you are performing a step down conversion to a very low level(from 50ohms to 50ohms/16) which is completely mismatched.
      

      All the current is going to the LO amplifier alone and when disabled, no current control is available to start with.
      

      Thanks,
      

      Namratha
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 

	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Feb 8, 2022 1:30 PM
            
            
												
						in reply to Namratha
					
									
        
	
        

		
		
        
					
        Hi Namratha,
        

        

        thanks for the reply , but  my question is about the impedance of IF on disabled state... 
        

        Let say, i use an standar 1:1, 50Ohm ,matched transformer,. On Disabled Vs could be positive? o needs to be 0 when the mixer is disable?.. 
        

        

        I appreciate if you go tru this point
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        •