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HMC716 Obsolete
The HMC716LP3E is a GaAs PHEMT MMIC Low Noise Amplifier that is ideal for fixed wireless and LTE/WiMAX/4G basestation front-end receivers operating between...
HMC716 on Analog.com

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Stability of Multi-stages of HMC716



		

			

									
					    RHadi
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 23, 2017 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I have a stability problem and positive S11 in the amplifier HMC716. I have fabricated two stages of these amplifiers in one PCB. Between these two stages, I put 4 stages of bandpass filters chips from minicircuits. My question is what is the function of 0-ohm resistor that should be placed in output TL of this amplifier? Can I get the de-embedded S-parameters of HMC716 amplifier?
    
									
			        
		
    

				
						
        

    
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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi,
      
 
      zero ohm on the EVB has no purpose, you do not need to use that in your design.
      
 
      We do not have de-embedded s-parameters, but you can use the spars given on the product page and the gerber files to model the PCB in a software environment for de-embedding.
      
 
      You can also try the same signal chain with some attenuators between the amps and the filters to see if the problem is due to a impedance mis match.
      
 
      Best,
      
 
      Kagan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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