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PLL NOT WORKING IN TEMPERATURE



		

			

									
					    Jayaprakash
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 11, 2014 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Sir,
    
 
    Pls help to find an unlocking issue in PLL ckt using AD4156 and HMC587 VCO.It became unlock b/w the temperature range of +17 to +20 C.Freq is 5.5GHZ.It is working fine above and below this range.
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		






				

			
    
			
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                                                	 Oct 31, 2014 
						
										
						
												+1
											
        
				
        
				
					
         
        
 
        Sir,
        
 
        Finally I could find out the problem.The pad of LNA detached (very very small portion) from the body.The image attached is taken using a magnifier having 110 zoom.HMC 587 output is divided using…
        
				
			
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        •  Analog Employees  
        
            
			                            
                        
                on Oct 13, 2014 5:40 PM
            
            
					
        
	
        

		
		
        
					
        Can you isolate the problem to see if it is the ADF4156 or the HMC587 that is failing?
        
 
          
  
        • Is there any output from the VCO at these temperatures? Are all the supply pins at the correct voltage?
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        • For the PLL, can you program the various Muxout modes? i.e. when the loop is failing, can you program DVDD and GND on Muxout and measure them with a multimeter?
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													0
							
			
				
									
							        
			
			
			
        •  Analog Employees  
        
            
			                            
                        
                on Oct 13, 2014 5:40 PM
            
            
					
        
	
        

		
		
        
					
        Can you isolate the problem to see if it is the ADF4156 or the HMC587 that is failing?
        
 
          
  
        • Is there any output from the VCO at these temperatures? Are all the supply pins at the correct voltage?
          • 
  
        • For the PLL, can you program the various Muxout modes? i.e. when the loop is failing, can you program DVDD and GND on Muxout and measure them with a multimeter?
          • 
 
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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