LPF
Active low-pass filter
Passes the intended lower-frequency signal content while attenuating higher-frequency content through an active filter circuit.
Schematic
Symbols · HPF
Active high-pass filter
Attenuates lower-frequency content while passing the intended higher-frequency signal band.
Schematic · HPF
What it represents
Attenuates lower-frequency content while passing the intended higher-frequency signal band.
On a schematic, identify the signal reference, filter order and lower-band boundary and trace the filtered output and its downstream gain/measurement path. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
High-pass behaviour differs from low-pass filtering and does not imply galvanic isolation of the signal.
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 signal reference, filter order and lower-band boundary.
- Trace the filtered output and its downstream gain/measurement path.
Information to show or reference
- Label the signal reference, filter order and lower-band boundary.
- Cross-reference the filtered output and its downstream gain/measurement path.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
High-pass behaviour differs from low-pass filtering and does not imply galvanic isolation of the signal.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Basic Linear Design, Chapter 8: analogue filter response families
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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