- Research and discuss the advantages and disadvantages of passive filters. Some advantages are, it is reliable, they can handle large voltage currents and power, there is no limitation on the frequency range, they do not need the additional dc power supply for their operation, easy to design, cheaper as compared to active filter, no amplifying elements, require no power supply, high frequency. Some disadvantages are, response problems, tuning for fixed frequency, fixed reactive power compensation, large in size, there is no isolation between input and output, the circuit becomes bulky if inductors are used, there is always some loss of signal it can be in the passband, this circuit cannot provide any gain, source loading can take place, there is no clear demarcation between passband and stopband but actually, it gets mixed up, in this frequency response is not sharp since when switching from passband to stopband there is no sudden change in output.
- Research and discuss types of passive filters and their use. Low-pass filters: attenuate or suppress signals with frequencies above a particular frequency called the cutoff or critical frequency. For example, a low-pass filter (LPF) with a cutoff frequency of 40 Hz can eliminate noise with a frequency of 60 Hz. High-pass filters: suppress or attenuate signals with frequencies lower than a particular frequency, also called the cutoff or critical frequency. For example, a high-pass filter (HPF) with a cutoff frequency of 100 Hz can be used to suppress the unwanted DC voltage in amplifier systems, if desired. Band-pass filters: attenuate or suppress signals with frequencies outside a band of frequencies. They are common in TV or radio tuning circuits. Band-reject, or notch filters: attenuate or suppress signals with a range of frequencies. For instance, a notch filter can reject signals with frequencies between 50 Hz and 150 Hz.
- Why do passive filters not provide current amplification? Since passive components consume power from the input signal, the passive filter does not provide power gain and the output signal has a lower magnitude than the input. It requires amplification post-filtering. Features of Passive Filter Passive filter use only passive components such as resistor, capacitor and inductor.
- What is circuit isolation and why is not having any of a passive filter a disadvantage? Isolation is a means of preventing current from flowing between two communicating points. Typically, isolation is used in two general situations. You don’t need isolation through a passive filter.
- What are first order and second order filter and what are their uses? High pass filter is a frequency selecting electronic circuit that controls the frequency components in a signal by attenuating blocking the low-frequency components and allowing only high-frequency components. An active filter means that its circuit contains an active component such as a transistor, operational amplifier Op-Amp, etc. for better performance but mainly for amplification.
