[<< wikibooks] Electronics Handbook/Devices/Filter/Tuned Resonance Selected Band-reject
== R - LC ==


=== Configuration ===


=== Characteristics ===

  
    
      
        
          
            
              V
              
                o
              
            
            
              V
              
                i
              
            
          
        
        =
        
          
            
              j
              ω
              L
              +
              
                
                  1
                  
                    j
                    ω
                    C
                  
                
              
            
            
              R
              +
              j
              ω
              L
              +
              
                
                  1
                  
                    j
                    ω
                    C
                  
                
              
            
          
        
      
    
    {\displaystyle {\frac {V_{o}}{V_{i}}}={\frac {j\omega L+{\frac {1}{j\omega C}}}{R+j\omega L+{\frac {1}{j\omega C}}}}}
  

  
    
      
        T
        =
        R
        C
      
    
    {\displaystyle T=RC}
  

  
    
      
        
          ω
          
            o
          
        
        =
        
          
            1
            T
          
        
        =
        
          
            1
            
              R
              C
            
          
        
      
    
    {\displaystyle \omega _{o}={\frac {1}{T}}={\frac {1}{RC}}}
  


== R - LC// ==


=== Configuration ===


=== Characteristics ===

  
    
      
        
          
            
              V
              
                o
              
            
            
              V
              
                i
              
            
          
        
        =
        
          
            
              j
              ω
              C
              +
              
                
                  1
                  
                    j
                    ω
                    L
                  
                
              
            
            
              R
              +
              j
              ω
              C
              +
              
                
                  1
                  
                    j
                    ω
                    L
                  
                
              
            
          
        
      
    
    {\displaystyle {\frac {V_{o}}{V_{i}}}={\frac {j\omega C+{\frac {1}{j\omega L}}}{R+j\omega C+{\frac {1}{j\omega L}}}}}
  


== Summary ==
The two configurations above can be used for Tuned Resonance Selected Band Reject Filter