# Questions tagged [band-pass]

Bandpass is an adjective that describes a type of filter or filtering process; it is to be distinguished from passband, which refers to the actual portion of affected spectrum. Hence, one might say "A dual bandpass filter has two passbands." A bandpass signal is a signal containing a band of frequencies not adjacent to zero frequency, such as a signal that comes out of a bandpass filter.

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### Impedance calculation

How can I calculate this band-pass filter input impedance? I know from the datasheet that the Ri and the R0 of the ampop are 2M$\Omega$ and 75 $\Omega$ and the Gain at the central frequency is 30 ...
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### Can a filter change the frequency of the input signal?

I am given a square wave with Vmin = 0V and Vmax=5V , T(period)=8ms and duty cycle 25%. I am asked to find the properties(low cutoff , high cutoff , bandwidth) of a band pass filter that will make the ...
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### Band pass filter , component values

The input of the band pass filter is 30Khz triangular wave of 1Vpp. I want the band pass filter to allow 27k-33k Hz . I have used these values based on the formulas I found online for this band pass ...
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### Completely different circuit response with 1000kΩ than with 1MΩ resistance

I have the following circuit (a band-pass filter) and I cannot understand what's the difference of a 1000kΩ resistance to a 1MΩ as seen here: With R223 = 1000k, my circuit outputs the expected ...
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### triangle wave form to sine form through band pass filter

Why and how does this active band pass filter change a triangle form to a sine form? I know that the band pass filter consists of a low pass and a high pass , so it cancels out some frequencies , but ...
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### Band pass filter , circuit analysis

So I have found the circuit for a band pass filter. I know its function and what it does, but I haven't understood yet why its components are placed were they are. Why are the capacitors and the ...
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### Transfer Function Of Multiple Feedback Bandpass Filter

I am trying to figure out the transfer function for this bandpass filter (images below). I am sorry for badly drawn circuit. The operational amplifier is an ideal op amp. I'd like to know if I ...
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### Why is the gain of this LC two-port network infinite?

Consider the following two port network, where a voltage is measured across the output terminals (no current), and the input is connected to an AC power source: Calculating the voltage gain of this ...
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### LTSpice Transconductance Amplifier Simulation

I'm trying to simulate a band-pass transconductance amplifier in LTSpice, which looks like this: I used the recommendations of this post - https://electronics.stackexchange.com/a/278870/87695 - and ...
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### How to pass a square wave through transfer function in MATLAB?

I am currently trying to create a band stop filter which attenuates frequencies between 2000Hz and 8000Hz. I have got the transfer function but now I am struggling to find the documentation on how to ...
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### How to determine the RLC values for a bandstop filter

I've been looking through the vague online documentation for designing a basic bandstop filter. I have the two frequencies which I want to attenuate but I cant seem to find how to calculate the values ...
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### Why do inductors like these do not work

I was trying out a series RLC band stop filter on hardware but for some reason it was not working, I later figured out that the culprit was the inductor after testing both inductor and capacitor via ...
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### How would one design a circuit to detect energy in the 3-140GHz ranges economically

We are looking to make something to detect RF frequencies in the SHF and EHF bands, from 3-140GHz, without requiring much frequency or amplitude accuracy. It would be ideally split into a few bands, ...
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### Center Frequency Shift Bandpass Filter

I have set Tow-Thomas filter to get bandpass output. I want center frequency to be precise as much as possible. If there occurse center frequency shift in the lab, what are possible way to compensate ...
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### How to find Vout for the following band pass filter

I have a problem finding the following Vout for this circuit. Is it possible to just use the following formulas that i have shown. I am just unsure due to the resistors. I assume that what i have ...
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### UPDATED:How to do Band Pass Filter Analysis for the current circuit

For the following circuit i am having trouble finding the following respective cutoff frequencies as i am unsure on if i need to take in to account R3 for the high pass portion. Also for the low pass ...
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### Understanding Parallel RLC circuit

I am currently going through the MIT 6.002 lecture videos to help prepare me for my upcoming electronics final, and I came across something that I didn't quite understand https://youtu.be/WT-qzgaKeGI?...
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### Cascaded Filter Output Not Correct

I am simulating a speaker system with tweeter, woofer, and midrange speakers. I know my values for the components are all correct, but the output plot is a little off. The passbands should be a little ...
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### Fourth-order bandpass filter Bessel - I can not solve the final part (math accounts)

With the previous gain function you calculated, design a Bessel fourth-order bandpass filter with center frequency $f0 = 10 kHz$ and bandwidth $Bf = f0/10$. I did the calculations with the ...
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### Filter-Amplifier circuit for Low Voltage I/P circuitry

I'm designing my first ever circuit for a hobby project. I've a sensor that outputs in mV (1 to 2) and a controller with ADC. The ADC is 16 bits, VDDA = 3.0 V, Temp = 25 °C, fADCK = 1.0 MHz. Since the ...
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### Op-Amp Input Bias Compensation for Multiple Feedback Filter

I'm adding an input bias current compensation network to the positive op-amp input of my band-pass multiple-feedback filter. I'm setting the source impedance for the positive input pin equal to that ...
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### Problems with implementation of a band-stop filter on an MCU (dsPIC) using fixed-point arithmetic

I'm trying to implement a band-stop (notch) filter on a microcontroller dsPIC33EP64GS506 to filter out a 100 Hz component from ...
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### Band-pass filter doesn't work

simulate this circuit – Schematic created using CircuitLab I designed this as it would pass frequencies between 400-600 Hz. But it passes every single frequency anyway. What is the problem?
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### Need help on-parallel resonant circuit vs. bandpass filter!

These two types of circuits, parallel (LC) resonant and bandpass filter (i.e. some resistance connected with parallel resonant circuit in series). Please tell me when to use which one and what are the ...
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### How could I design a circuit for a solar panel so that it only produces output from a red laser?

I'm designing a little laser tag system with some arduino's as a little project for Christmas break and I'm having trouble figuring out how to make my solar panel receive information from my laser ...
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### Order of the filter

I can't seem to figure out the order of the filter. With the knowledge i have, "The order of the filter depends on how much change there is in the (20x)dB/decade in the amplitude response." If it ...
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### Second Order Bandpass Filter vs Second Order High Pass and Low Pass in Series

Is using a second order bandpass filter less effective than using a second order high pass filter and a second order low pass filter one after the other? I tried a bandpass filter to filter out ...
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### Advice on 4th-Order Bandpass Filter

I am trying to design a 4th-Order bandpass filter with the following specifications; centre frequency 30 MHz, bandwidth 5 MHz and of course minimising loss. I present my current design below which I ...
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### The Cutoff frequency of bandpass filter

Given: Center Frequency f0 = 2.2KHz Q factor = 5 The problem I'm facing is this: How do I calculate the 2 cutoff frequencies of this band pass filter? I'm confused because my question says "The ...