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ADF4382 Recommended for New Designs
The ADF4382 is a high performance, ultra-low jitter, fractional-N phased-locked loop (PLL) with an integrated voltage controlled oscillator (VCO) ideally...
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ADF4382 on Analog.com

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ADF4382 EVK and Simulation difference

		
	
				

			

									
					    JonathanWL
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Mar 9, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user observed an 8-10 dB difference in phase noise at 1k, 10k, and 100kHz offsets between ADSimPLL simulation and ADF4382 EVK results, despite using the same 10MHz reference and loop filters. The support engineer acknowledged the issue and offered to discuss it offline.
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  ADF4382 

    		        		    		    

		    		    
		    			

			    
Hello, 


I found out ADSimPLL and ADF4382 EVK results has difference in Phase noise in the 1k, 10k and 100kHz offset by 8 to 10dB. And, I use the same reference of 10MHz and phase noise table in the comparison which I changed from the original 125MHz Ref.. Also, I used the same loop filters in the simulation value and EVK for my 10MHz Ref. design. 


Could someone help checking where I might be wrong between the simulation Vs. EVK results?  




Thanks!

			

			
									
		                             
                        

    

                                            
                 hardware
                
                                                    
                 ADF4382
                
                                                    
                 Fractional-N PLL
                
                                                    
                 Phase Locked Loop (PLL) Synthesizer & Translation Loop