A 20-kHz, Third-Order Low-Pass Filter

Posted on February 9, 2010 by Adam

This is a third order low pass filter that has corner frequency of 20kHz. It is twice as high as the auto-zero clock frequency. Here is the circuit :

A 20 kHz Third Order Low Pass Filter circuit schematic diagram

The input signal operation is allowed to across its entire gain bandwidth because intermodulation  and aliasing noise are highly attenuated. This circuit also has rail-to-rail drive capability provided by amplifier’s output, allowing for a high signal-to-noise ratio at low supply voltages. [Source: Texas Instruments Application Note]

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