From: pchung705@gmail.com   
      
   It is obvious that with signal frequency increase, impedance of parallel R-C   
   circuit decreases, since impedance of the capacitor decreases with frequency,   
   and capacitor is in parallel with the resistor.   
      
   Read more:   
      
   http://www.cirvirlab.com/index.php/electric/parallel-r-c-circuit-impedance.html   
      
   and calculate   
      
   http://www.cirvirlab.com/simulation/parallel_r_c_circuit_impedan   
   e_calculator.php   
      
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