I'm trying to simulate a bandpass filter in ltspice.bandpass filter should be in the 2-5 Hz frequency rangeI calculated the capacitor and resistor value for this range. However, the simulation results are not good. I use the Sallen-switch bandpass filter design.I watched some videos about bandpass filter. But my frequency range is very narrow. In particular, there is a part of my project that needs to work in the 1-2.5 Milihertz (mHz) frequency range. So when I calculate the value of the components, the results are very different and it is difficult to find them at the right value in the market.
Part of this circuit will be a total of 9 bandpass filter structures. These structures are, for example; Since it is around 1-2.5mHz, 6-16mHz or 270-750mHz, I cannot get a good value in the simulation.
when I calculate gain I use K determine order is that right?
Therefore, what can you recommend in the millihertz frequency range?
Does LTspice give accurate results in the millihertz range?
Can you recommend different sources for bandpass filter designs?
- https://www.youtube.com/watch?v=PKjEDrIzd_M&list=PLXb3r5ny8_1WUrR6kEH714BuuRv07h1S7&index=7
- https://www.ti.com/lit/an/sboa229/sboa229.pdf?ts=1716711100722&ref_url=https%253A%252F%252Fwww.ecosia.org%252F
- https://www.ti.com/lit/an/sloa024b/sloa024b.pdf?ts=1716740363285
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it has calculated by 2-5 Hz of component valuesImage may be NSFW.
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totally my circuit will look like this.I will change the topology
