I have a question about the first circuit schematics.
I calculated the second circuit's fcutLow and fcutHigh frequencies like this:
f2CutHigh = 1/(2 * π * 1M * 100p) = 1.6 kHz
f2CutLow = 1/(2 * π * 10k * 10μ) = 1.6 Hz
But for the first circuit:
Blockquote Why is such amplifier configuration chosen for HB100 microwave sensor?
I saw this calculation and I didn't understand it.
- Why is step 1 used like that (as I understood it, it is a passive high-pass filter)?
- Why do 2-3 or 4-5 calculate Fcutlow = 4.7μ-10k and FcutHigh =2.2n-1M with each other?
- Why did they use a voltage divider for the second-order op-amp?