# Fundamental Physics/Electronics/Electronics Filter

## Electronics Filter[edit | edit source]

Filter is an electronics device that provide a constant voltage , does not change with frequency , over frequency . It's reponse can be characterized from its Transfer function

There are 5 types of filters Low pass filter , High pass filter , Band pass filter , Resonance tuned bandpass filter . Resonance tuned bandreject filter

## Low pass filter[edit | edit source]

Low pass filter is an electronics device that has a constant voltage over low frequency . Low pass filter can be constructed from LR and RC as shown .

Low pass filter has a transfer function

Frequency response of Low pass filter

Cut off frequency, , frequency at which

## High pass filter[edit | edit source]

High pass filter is an electronics that has a constant voltage over high frequency . High pass filter can be constructed from LR and RC as shown .

High pass filter has a transfer function

Frequency response of High pass filter

Cut off frequency, , frequency at which

## Band pass filter[edit | edit source]

Low pass filter has a constant voltage over a band of frequencies . Band pass filter can be constructed from LPF and HPF

Band pass filter has a transfer function

Frequency band pass that has constant voltage

## Resonance tuned band pass filter[edit | edit source]

Transfer function

Frequency response

- Capacitor opens circuit
- Inductor opens circuit

## Resonance tuned band rejected filter[edit | edit source]

Transfer function

Frequency response

- Capacitor opens circuit, inductor shorts circuit
- Inductor opens circuit, capacitor shorts circuit