Filters Flashcards
What are the most common types of filters?
Resistor-Capacitor (RC) filters are commonly used because they are cheap and compact
What are the four types of filters?
Low-pass Filters (LPF)
High-pass Filters (HPF)
Band-pass Filters (BPF)
Band-stop Filters (BSF)
Which filters are connected in series?
The series connection of a high-pass filter and a low-pass filter is called a band-pass filter.
Which filters are connected in parallel?
The parallel connection of a high-pass filter and a low-pass filter is called a band-stop filter.
What component tends to block high frequencies?
The inductor’s impedance increases with increasing frequency. This high impedance tends to block high-frequency signals from getting to the load or pass to ground.
What components tends to allow frequencies to pass to ground or get to the load?
The capacitor’s impedance decreases with increasing frequency. This low impedance allows signals to get to the load or pass to ground.
What do low pass filters do?
Low-pass filters let low frequencies pass – including DC voltages – but block frequencies above the upper cut-off level.
How does an inductive low pass filter work?
In the inductive low-pass filter, the inductor’s impedance increases with increasing frequency. This high impedance in series tends to block high-frequency signals from getting to the load.
How does a capacitive low pass filter work?
In the capacitive low-pass filter, 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 R1
What frequencies do high pass filter block?
High-pass filters let high frequencies pass but block frequencies below the lower cut-off level.
How does a capacitive high pass filter work?
High-pass filters let high frequencies pass but block frequencies below the lower cut-off level.
How does an inductive high pass filter work?
The inductor’s impedance decreases with decreasing frequency. This low impedance, in parallel, tends to short out low-frequency signals from getting to the load resistor. Consequently, most of the voltage gets dropped across series resistor R1.
How is a band pass filter created?
Band-pass filters can also be created by combining a low-pass filter with a high-pass filter.
What does a band pass filter do?
Band-pass filters only let frequencies of a particular band (channel) pass. They have an upper and a lower cut-off frequency. An example of an analogue electronic band-pass filter is a Resistor-Inductor-Capacitor (RLC) circuit.
What does a band stop filter do?
Band-stop filters let all frequencies pass, apart from a particular frequency band (channel). The damping for this band is as high as possible. Band-stops also have an upper and a lower cut-off frequency. A band-stop filter is the opposite of a band-pass filter.
