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.

Filter by
Sorted by
Tagged with
0
votes
1answer
79 views

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 ...
0
votes
2answers
289 views

What bandpass Q factor do I want for 12dB/octave roll off?

Sorry for what may be a dumb question. I'm used to thinking about low and high pass filters in terms of db/octave (e.g. 6db for passive RC filter). Whats the equivalent Q factor for a bandpass ...
0
votes
3answers
128 views

Determining cut offs frequencies of band-pass filter

I have an RC network as follows: simulate this circuit – Schematic created using CircuitLab As far as I can tell, this has the transfer characteristic: $$ \begin{align} \frac{V_{out}}{V_{in}}=...
0
votes
1answer
507 views

How do I create a working bandpass filter in LTSpice?

I am attempting to create a bandpass filter in LTSpice. I am fairly new to the program, which is probably contributing to my difficulties. The filter I am creating needs to have a center frequency of ...
0
votes
1answer
97 views

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 ...
0
votes
1answer
146 views

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 ...
0
votes
2answers
866 views

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 ...
0
votes
1answer
93 views

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 ...
0
votes
1answer
475 views

Bandpass Filter Attenuation?

I'm trying to split an audio signal into 5 channels, letting 5 different ranges through each filter (low, mids, highs, etc..). What I'm finding is that each bandpass filter has different levels of ...
0
votes
2answers
5k views

Designing a multi-stage BJT amplifier

For my final lab this semester, I've been tasked with designing a multi-stage amplifier that serves as a receiver in a laser tag set that we've been building over the course of the class. I've ...
0
votes
2answers
160 views

Band pass filter bandwidth problem

I am trying to design a band pass filter that allows frequencies between 16,384Hz and 32,768Hz. Firstly I tried to make it using a passive RC band pass filter: Using the formula fc = 1/2πRC, the ...
0
votes
1answer
50 views

How to calculate cutoff freqeuncy of Bandpass filter, given an attenuation dB level (OTHER THAN -3DB)

I know that -3dB is the accepted standard, where the power of the signal is at 50%, and that upper and lower cutoff frequencies are calculated with regards to this value, and there are simple formulas ...
0
votes
2answers
339 views

Calculating Phase/Time Delay induced by a 2-pole Bandpass filter? ie. Group Delay?

If you have a two-pole Butterworth bandpass filter described by a particular Q value (Q>0.5) and a resonant center frequency "f", is there any equation that will tell you the phase/time delay induced ...
0
votes
2answers
660 views

I need to design a bandpass filter by cascading passive high pass filter and passive low pass filter

I have a low pass filter with 3db cut off frequency of 200Hz and a high pass passive filter with 3db cut off frequency of 2kHz. I need to design a cascaded band pass filter which will isolate ...
0
votes
2answers
124 views

Loss due to impedance matching in a filter

I have a quite basic question, after starting to re-read some RF theory. If a voltage source has a resistance of 50 ohms, and the equivalent impedance of a connected bandpass filter and its load are ...
0
votes
2answers
102 views

Natural frequencies of a bandpass filter

I have the following frequency transform used to design a low-pass prototype out of a bandpass specification mask: $$\omega=\frac{\omega_0}{B}\left(\frac{\omega'}{\omega_0}-\frac{\omega_0}{\omega'}\...
0
votes
2answers
148 views

Is it possible to filter a frequency?

I have built and tested an active band pass filter, with the intention of creating a speed detector, whose lower and upper cut off frequencies are 48 Hz and 1591 Hz respectively. During testing I ...
0
votes
1answer
436 views

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 ...
0
votes
1answer
309 views

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 ...
0
votes
1answer
555 views

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?...
0
votes
1answer
427 views

Are cutoff frequencies of bandpass and bandstop filters equal?

Consider the two filter in picture simulate this circuit – Schematic created using CircuitLab Are the cutoff frequencies (i.e. the two frequencies at which \$V_{out}=\frac{1}{\sqrt{2}} V_{in}\$...
0
votes
3answers
399 views

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 ...
0
votes
1answer
127 views

How to modify this tank circuit to obtain a 3rd order passive band pass filter?

I am very confused about band pass- and band rejectfilters. I have this circuit which represents a bandpass filter. A 2nd order (2 energy exchanging elements) bandpass filter if I am not mistaking: ...
0
votes
2answers
407 views

Multi-feedback active bandpass filter - transfer function derivation

new to this forum. I have a question about a certain topic I'm struggling with. I have this circuit, C1 and C2 are equal and therefore just described as C: I want to deduce the transfer function Vout/...
0
votes
1answer
958 views

How to choose resistance and capacitance value in active bandpass filter?

I am trying to make a bandpass filter around 300Hz using this circuit. I have calculated the values of the components using the equations shown in this website assuming low frequency cutoff 160Hz and ...
0
votes
1answer
32 views

Is there a configuration where a circuit acts as Bandpass filter in one direction and Bandstop in other?

I am not an expert in electronics. Hence, I am looking for a broad conceptual answer. Is it possible to a directional Bandpass/Bandstop filter i.e. Bandpass in one port and Bandstop in another.
0
votes
0answers
58 views

Preamplifier Circuit Test

I designed a preamplifier circuit for vibration signals. the preamplifier circuit is bandpass filter with 60 db gain. I did simulations with LTSpice and I think it has good response but I want to ...
0
votes
2answers
61 views

Active band pass filter + offset

I'm trying to know the fr equation for the following op amp configuration: I have some capacitors values for specific fr frequencies: fr = 34Hz -> C = 33nF fr = 50Hz -> C = 22nF fr = 160Hz -> C = ...
0
votes
1answer
45 views

Adjusting the gain on a 4th Order Butterworth Bandpass fIlter gain

I designed a bandpass filter with the TI filter designer tool but I initially designed with a gain of 40 dB. However, I'd like to reduce the gain to 20dB but I'm having issues doing trying to figure ...
0
votes
0answers
67 views

RC bandpass filter using two port network parameters?

So my assignment is about exploring two port networks and the use of the 4 parameters, now one of the tasks is to design a bandpass filter with cascaded high pass and low pass filters, now I am really ...
0
votes
1answer
75 views

Why Deliyannis bandpass filter with high Q does not have the expected transfer function bode plot

What i need is to design a delyiannis band-pass filter with Q enhancement technique. The theoretical analysis of this technique is referred here in pages 107-112. For those who don't know how to ...
0
votes
1answer
87 views

Easiest way to find transfer function of a lossless ladder filter after we finish design?

I have completed my Lossless Ladder BPF design, but I don't know how to find the transfer function of the resulting circuit without going through the slow and rigorous process of getting resistances ...
0
votes
2answers
137 views

What is the difference between a Sallen-Key Band pass filter and a band pass filter?

Am currently doing an assignment on sine wave generation and am using a sallen key band pass filter - i am unsure what the difference between the band pass filter and the sallen-key band pass.
0
votes
3answers
145 views

Predicting decay time of a resonant bandpass filter?

In a typical resonant bandpass filter, resonance is set as none at 0 and full at 1, such that the filter rings infinitely at 1 and not at all at 0. If there is a two-pole resonant bandpass filter, ...
0
votes
0answers
299 views

whats the difference between a cascaded band pass filter and a normal band pass filter (Audio visualizer)

simulate this circuit – Schematic created using CircuitLab currently im building an audio visualizer i would like to know what is the difference between a cascaded 2nd order band pass filter ...
0
votes
1answer
105 views

components used to make a butterworth filter

I doing some amateur radio experimentation and want to create a bandpass filter. I believe that a Butterworth filter would be good because it has a flat frequency response in the pass band. My center ...
0
votes
1answer
389 views

Quality factor limit for 2nd order RC passive band-pass filter

simulate this circuit – Schematic created using CircuitLab I'm designing a 2nd Order passive RC band-pass filter and found that the quality factor is given by: \$Q=\frac{\sqrt{C_1C_2R_1R_2}}{...
0
votes
1answer
249 views

How to calculate the gain of a RLC tank filter?

I'm supposed to create a passive bandpass filter to select a reasonably sinusoidal 750 Hz signal from a 250 Hz square wave. Since we have very limited choices for the inductor (0.03 H) and capacitor ...
0
votes
1answer
267 views

Determine by the order of transfer function what kind of filter

How can I determine by looking at the following tranfer function, that is this the transfer function of a band-pass filter: $$\frac{1}{as^3+bs^2+cs+1}$$
0
votes
0answers
449 views

LC band pass filter

I'm looking at implementing an LC bandpass filter, where I want upper and lower cut off frequencies to be 1254 Hz and 48 Hz respectively. Based on the pictures I've added - from http://www.radio-...
0
votes
1answer
1k views

Deriving Bandpass Transfer Function

I'm designing a bandpass filter and have been doing some reading on it. I found a transfer function describing the circuit (which apparently all formulas describing this circuit are derived from): $$...
0
votes
1answer
492 views

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 ...
0
votes
2answers
600 views

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 ...
0
votes
0answers
54 views

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, ...
0
votes
1answer
490 views

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 ...
0
votes
1answer
325 views

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 ...
0
votes
0answers
613 views

Bandpass Filter Design

I'm trying to split an audio signal ranging from 20Hz - 20kHz into five ranges of 0 - 250Hz, 250Hz - 500Hz, 500Hz - 2kHz, 2k-6kHz, and 6kHz - 20kHz. I've been trying to design the "Inverting Band ...
0
votes
2answers
277 views

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 ...
0
votes
2answers
4k views

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 ...
0
votes
0answers
232 views

FSK Bandpass Filters for 900 MHz

I'm attempting to design a basic FSK transceiver (architecture shown below) using only discrete components (transistors, diodes, resistors, etc). My idea was to separate the two binary frequency ...