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TX Monitor High and Low Gain

		
	
				

			

									
					    fischer
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 19, 2017 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    I have a question regarding the TX monitor gain. I write in the TX Monitor High and Low Gain register (0x067 and 0x068) the same gain value, eg. 20 dB gain.
    
 
    Then I control with the value in register TX Atten Threshold 0x078, which gain register is used. Is the attenuation written in register 0x073 above the threshold value in 0x078, the High gain is used, elsewhere the Low gain is used.
    
 
    Have I understood this correctly? Now my question: When switch between the Low and High gain by setting the threshold in 0x078 one time below and one time above the TX attenuation in 0x073, I get different signal amlifications. But I wrote the same gain value in the High and Low gain registers.
    
 
    Are there different gain stages used for High and Low gain, or is there only one gain stage choosing between those to gain registers?
    
			
    
			
									
		                             
                        
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 21, 2017 3:16 PM
            
            
						
			            		
      
		
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      We tested the issue but we were not able to find any problem. When same gain value is entered into High and Low Gain registers, no change in RSSI value was observed with change in Tx attenuation values. Can you give more clarity on how you tested It ?
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on May 23, 2017 8:04 AM
            
            
						
			            		
        
		
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        I have written in register 0x067 and 0x068 the same gain value of 20 dB. In register 0x073 and 0x074 I have written a attenuation value of 3dB. Now one time I have written in the TX attenuation threshold register 0x078 a attenuation threshold value of 148 dB (0x94) and the other time I have written a attenuation threshold value of 0 dB (0x00).
        
 
        Now when the threshold is 0x94, the low gain value should be used. But additionally the RX TIA settings are changed. E.g. the TIA 1 RF value in register 0x1DC is 0b11. When the threshold is 0x00, the high gain value should be used. Now the TIA 1 RF value is 0b01. The TIA  capacitor settings are changed too.
        
 
        My own TIA RF settings are overwritten by the monitor high and low gain setting. I cannot overwrite the TIA setting afterwards to my own settings again. So the monitor high and low gain setting must have same differences in gain, even when the same gain value has been chosen for both registers.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Aug 2, 2018 11:48 AM
            
            
						
			            		
          
		
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          This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

          Thank you,
          EZ Admin
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
				
						
						
				
				
		
		
          
			
		
          
	
          

          

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