Table of Contents
What is the purpose of using a low-pass filter prior to sampling an analog signal?
Anti-aliasing low-pass filters are required for data acquisitions systems to ensure that all sampled signals of interest can be reconstructed accurately. The filter characteristics required are determined by the bandwidth, amplitude resolution, and sampling rate of the ADC with which it is paired.
What is the difference between low-pass filter and high-pass filter?
High pass filter is the type of frequency domain filter that is used for sharpening the image. It attenuates the low frequency components and preserves the high frequency components….Difference between Low pass filter and High pass filter:
| Low pass filter | High pass filter |
|---|---|
| Low frequency is preserved in it. | High frequency is preserved in it. |
What is the output of a 100 kHz low pass filter?
The output of the 100 kHz low-pass filter has to have a stop band attenuation to bring signal components above Nyquist down to the ADC noise floor—in this case greater than -73 dB for frequencies greater than 500 kHz. There are many possible low-pass filter types or configurations.
What is the difference between low pass and high pass RC filters?
Both circuits have the effect of passing through low frequency signals while impeding high-frequency ones. A Low pass RC filter, again, is a filter circuit composed of a resistor and capacitor which passes through low-frequency signals, while blocking high frequency signals.
What is the Nyquist frequency of a 100 kHz low pass filter?
Operating at a sampling rate of 1 MS/s, the Nyquist frequency is 500 kHz. The output of the 100 kHz low-pass filter has to have a stop band attenuation to bring signal components above Nyquist down to the ADC noise floor—in this case greater than -73 dB for frequencies greater than 500 kHz.
How does frequency affect inductive low pass filter response?
The response of an inductive low-pass filter falls off with increasing frequency. The capacitor’s impedance decreases with increasing frequency. This low impedance in parallel with the load resistance tends to short out high-frequency signals, dropping most of the voltage across series resistor R 1.