Electronics Handbook/Circuits/Low-pass Filter
Low-pass Filter
editA low-pass filter has a stable voltage at low frequencies and increasing voltage at high frequencies.
Low-pass Filter , LR Configuration
editPicture
Vo/Vi
editFrequency Response
edit- ω = 0 .
- ω = .
- ω = 00 .
LR has a stable voltage at low frequencies and increasing voltage at high frequencies.
Low-pass Filter , RC Configuration
editVo/Vi
edit- với
Frequency Response
editRC has a stable voltage at low frequencies and increasing voltage at high frequencies.
Summary
edit- Low-pass filters have a stable voltage at low frequencies and increasing voltage at high frequencies.
- Low-pass filters can be constructed from RC or LR.
- Low-pass filters have a general formula:
- . T = RC =