Electronics Handbook/Devices/Filter/Low Pass Filter

Configuration

 * Low_pass_filter.svg

Characteristics

 * $$\frac{V_o}{V_i} = \frac{\frac{1}{j\omega C}}{R + \frac{1}{j\omega C}} = \frac{1}{1 + j\omega T}$$
 * $$T = RC$$
 * $$\omega_o = \frac{1}{T} = \frac{1}{RC}$$


 * Low-pass_filter.png

Characteristics

 * $$\frac{V_o}{V_i} = \frac{R}{R + j\omega L} = \frac{1}{1 + j\omega T}$$
 * $$T = RC$$
 * $$\omega_o = \frac{j\omega L}{R + j\omega L} = \frac{1}{1 + j\omega T}$$

Summary
The two configurations above can be used for /Low Pass Filter/ which has stable voltage which does not change with frequency over low range of frequencies