Howtosignalprocessing
- How to convert LPF to HPF?
- How can a first order low pass filter can be converted into second order low pass filter?
- What is the relative relationship between the cutoff frequencies of the low-pass and high pass filters you used in the band pass filter?
- What does a LPF do?
How to convert LPF to HPF?
Lowpass to Highpass
The lowpass prototype is converted to highpass filter by scaling by 1/s in the transfer function. In practice, this amounts to capacitors becoming inductors with a value 1/C, and inductors becoming capacitors with a value of 1/L for passive designs.
How can a first order low pass filter can be converted into second order low pass filter?
➢ The first order filters can be easily converted into second order filters simply by using an additional RC network within the input or feedback path. Then we can define second order filters as simply being two 1st-order filters cascaded together with amplification circuit.
What is the relative relationship between the cutoff frequencies of the low-pass and high pass filters you used in the band pass filter?
Clearly for a pass band filter to function correctly, the cut-off frequency of the low pass filter must be higher than the cut-off frequency for the high pass filter.
What does a LPF do?
A low-pass filter (LPF) is a circuit that only passes signals below its cutoff frequency while attenuating all signals above it. It is the complement of a high-pass filter, which only passes signals above its cutoff frequency and attenuates all signals below it.
