Electronics Handbook/Circuits/Low-pass Filter

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Low-pass Filter[edit | edit source]

A low-pass filter has a stable voltage at low frequencies and increasing voltage at high frequencies.

Low-pass Filter , LR Configuration[edit | edit source]

Picture

Vo/Vi[edit | edit source]

Frequency Response[edit | edit source]

ω = 0 .
ω = .
ω = 00 .

LR has a stable voltage at low frequencies and increasing voltage at high frequencies.

Low-pass Filter , RC Configuration[edit | edit source]

Vo/Vi[edit | edit source]

với

Frequency Response[edit | edit source]

RC has a stable voltage at low frequencies and increasing voltage at high frequencies.

Summary[edit | edit source]

  1. Low-pass filters have a stable voltage at low frequencies and increasing voltage at high frequencies.
  2. Low-pass filters can be constructed from RC or LR.
  3. Low-pass filters have a general formula:
. T = RC =