Practical Electronics/Low Pass Filter

From Wikibooks, open books for an open world
< Practical Electronics
Jump to: navigation, search

Low Pass Filter[edit]

LR Network[edit]


Plot three points above we have a graph . From graph, we see voltage does not change with frequency on Low Frequency therefore LR network can be used as Low Pass Filter


RC Network[edit]


Plot three points above we have a graph . From graph, we see voltage does not change with frequency on Low Frequency therefore LR network can be used as Low Pass Filter

Summary[edit]

In general

  1. Low Pass Filter can be constructed from the two networks LR or RC .
  2. Low Pass Filter has stable voltage does not change with frequency on Low Frequency
  3. Low pass filter can be expressed in a mathematical form of
T = RC for RC network
for RL network