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ADF4371 Recommended for New Designs
The ADF4371 allows implementation of fractional-N or Integer N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter and...
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ADF4371 on Analog.com

ADMV1017 Recommended for New Designs
The ADMV1017 is a silicon germanium (SiGe), microwave, upconverter and downconverter optimized for 5G radio designs operating in the 24 GHz to 29.5 GHz...
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ADMV1017 on Analog.com

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ADF4371 Phase Noise

		
	
				

			

									
					    Maxplus
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 28, 2022 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is seeking to improve the phase noise of the LO signal (11-11.5 GHz) generated by the ADF4371, which is degraded by the ADMV1017 LO multiplier. The final answer suggests using the ADF41513 with an external VCO (HMC534) for better phase noise performance. The user also explored using the ADF5610, which showed slightly better phase noise at higher frequency offsets due to its lower phase noise floor VCO. The ADF4371 has better in-band phase noise, but the ADF41513 with an external VCO is recommended for overall improvement.
                        	    
    
                
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    Hello
    

    I have simulated the phase noise of AD4371 to output LO signal between 11-11.5GzHz. ADISIM File attached. 
    

    The LO is applied to ADMV1017 which goes through x2 or x4 LO Multiplier which degrades the phase noise. 
    

    I like to improve the phase noise of the LO coming out of ADF4371. Can someone please advise how can I improve the phase noise? 
    

    Thank you.
    
			
    
			
									
		                             
                        

    
    
                                            
                 RF Mixers
                
                                                    
                 I/Q Upconverters/Transmitters
                
                                                    
                 rf & microwave
                
                                                    
                 Fractional-N PLL
                
                                                    
                 admv1017
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
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