# Active notch filter

Canonical URL: https://eloragrid.ai/symbols/active-notch-filter
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: NOTCH
Drawing use: Schematic
Reference families: Manufacturer

Attenuates a defined frequency region while retaining the intended content outside it.

## What it represents

Attenuates a defined frequency region while retaining the intended content outside it.
On a schematic, identify the rejection-frequency reference, bandwidth and active circuit supplies and trace the filtered output and measurement use. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
The notch response does not identify the actual frequency or depth without the selected filter design.
The preview is an independently drawn educational functional reference. Add the selected component’s actual power pins, terminal numbers, timing or analogue reference details when producing a construction drawing.

## How to read it

- Identify the rejection-frequency reference, bandwidth and active circuit supplies.
- Trace the filtered output and measurement use.

## Information to show or reference

- Label the rejection-frequency reference, bandwidth and active circuit supplies.
- Cross-reference the filtered output and measurement use.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.

## Important distinction

The notch response does not identify the actual frequency or depth without the selected filter design.

## Facts

- Common schematic mnemonic: NOTCH — descriptive only; project/device documentation defines reference designations.
- Terminal / interface focus: The rejection-frequency reference, bandwidth and active circuit supplies
- Artwork scope: Original educational functional/circuit reference; not a selected product pinout.

## Public references

- [Basic Linear Design, Chapter 8: analogue filter response families](https://www.analog.com/media/en/training-seminars/design-handbooks/Basic-Linear-Design/Chapter8.pdf) — Analog Devices. Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.