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Level Control Loop with AD8314 RF Log Detector



		

			

									
						avilla
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on May 1, 2013 
				
			
			
		


				
		

		    		    
		    
		    	
			
I am designing an RF level controller with the AD8314 Logarithmic RF Detector, using it's non-inverted output (V_UP, pin 6). 

 
According to the datasheet, the loop filtering capacitor Cf should be placed between pin 4 (FLTR) and pin 6 (V_UP). 

 
Maybe I'm wrong, but if pin 4 (FLTR) is an internal current summing node,  why not connect Cf directly between pin 4 (FLTR) and ground like with the  AD8315?

 
Thank you very much in advance, and best regards.

 
Alberto