A filter modifies signals based on their frequency.

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Results analysis of the sequential filter and strength-reduced filter in frequency domain

I realized two low-pass filters by Verilog. The filter can be represented as following equation: 1. Sequential filter with 32 stages. For saving the multipliers, I only use one multiplier and do ...
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2answers
45 views

Capacitor selection for filtering of low level signal

I am currently dealing with low level signal(voltages in milli-volt from the sensors) for the first time. I was advised to use filtering circuit moreover RC filtering which I have already implemented. ...
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1answer
66 views

What is the harmonic content of a PWM signal?

Suppose I'm using a 3.6 kHz carrier to reproduce a 60 Hz sine wave. To properly design a filter for this application to hit a specific harmonic distortion target, I need to know the harmonic content ...
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2answers
46 views

Solving RC filter by differential equation

I'm trying to solve the differential equation of a simple RC filter. What i got so far is: $$CRV'+V=V_0\sin(\omega t)$$ Solving i get: $$V == \frac{V_0 \sin(\omega t)}{1 + R^2C^2 \omega^2} - ...
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40 views

How to discharge a capacitor quickly…(filter of an H-bridge/inverter)

I have used four IGBTs to build an H-bridge… the inputs of the h-bridge are SPWM and are programmed in a way as shown below: The output of the H-bridge is a three level pwm(as expected), and then its ...
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17 views

What is pulse train filter in the context of a control system?

I have recently seen some code written in modelling tool like Simulink, ASCET which uses PT1 filter? Why do we use a pulse train filter? What is the difference between FIR, IIR, Chebyschev, ...
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1answer
20 views

Finding the system function of a digital filter

I am studying for exams and I need help with a question I came across in a textbook. Given a digital filter $$y_n = a(x_{n-1} + x_{n+1}) + bx_n$$ find the system function of this filter and the ...
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2answers
39 views

What is the filter and the transfer function that shown below?

May i know above is below to which type of filter? is it a low pass filter? and what is the transfer function for the circuit, may i know the step to drive it? Thank you
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2answers
215 views

Filtering Capacitors before the fuse or after the fuse while limiting inrush current?

There are basically two questions I have for this circuit. 1) Which capacitor configuration is good? before fuse or after fuse 2) How do I limit my inrush current? My thoughts: I am confused ...
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1answer
76 views

How do I properly size components for an EMC filter for a variable frequency drive power supply?

One of the products my company designs is, essentially, common bus power supplies for variable frequency drives (VFDs). Thus far we have only sold into the United States. We are considering selling ...
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2answers
61 views

Anti Aliasing Filter and the bandwidth selection

I am currently analyzing the raw measurements of a sensor with the sampling frequency of 400[hz]. According to Nyquist theorem, the bandwidth must be less than a half of the sampling frequency, which ...
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2answers
47 views

RC network (Filter) output calculation

I have an RC circuit with a transfer function $$ h(s)=\frac{1}{1+0.0033s} $$ Is it possible to calculate theoretical output of this network for a set of input voltages? For this how do I solve this ...
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1answer
30 views

Input and out put SNR of Low pass filter

A low pass filter has L=20mH and C=0.0012F .the input signal amplitude is 2V peak to peak and its frequency is 5k Hz .An unwanted noise input is also prsent with amplitude of 0.2 V peak to peak and a ...
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0answers
30 views

voice frecuency filter

im building a circuit, it must take a audio recording, of somebody speaking on the street or something like that , or it could be also someone speaking with some noise next to him , and the idea is ...
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2answers
636 views

Why are caps configured this way in EMC filters?

Every EMC filter I've seen has capacitors between the AC lines and earth, configured like this: simulate this circuit – Schematic created using CircuitLab Why are the caps not configured ...
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4answers
370 views

Rc network placing R before C vs after

simulate this circuit – Schematic created using CircuitLab Using a rc network to smooth a PWM signal from a microcontroller, to a true analogue voltage. What will be the effect of having ...
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2answers
45 views

Best Filter Type

I have a sine wave (uV level) that is in varying frequency (1kHz to 8kHz). I like to design a band pass filter that attenuates the other frequencies while amplifying my target frequencies and this can ...
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2answers
47 views

Determining the frequency response of an audio crossover (something seems off)

I'm in the process of putting together an audio crossover. I finished assembling the components, and I though it would be neat to do a frequency sweep on the filters. When I inspected the tweeter ...
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0answers
46 views

Is there any way to reduce THD for low pass filter?

I got low pass Sallen-Key filter for 8 kHz corner frequency but I still got too high THD for 8 kHz frequency and 10V output amplitude. THD I would like to achieve is less than 0,2% but now I got more ...
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2answers
236 views

Why are high values of capacitance in low pass active filters not recommended?

I am designing low pass active filter (Sallen-Key structure) and I have come to a point where I have to decide what should be the value of C (C1 = C2 = C) and then calculate values of resistances. I ...
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1answer
41 views

USB switching power supply filter

Good afternoon fellow students of life, I have a particular question that relates to the use of a Duracell USB switching power supply as the main supply for a high sensitivity sensor board. Most of ...
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1answer
36 views

Safe way to interface directly with HomePlug / Powerline

I'm looking to do some research into the actual messaging used by powerline adapters. I'm aware of the standards, but I'm specifically looking to see where real devices deviate from the standard, and ...
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1answer
33 views

How to determine if this filter is stable

Hi I have a filter which has the following transfer function: H(z) = (z^2 + 0.04)/(z^2 + 3.24) for which i need to determine whether this is stable or not. I'm not sure how to attempt this, but I'm ...
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1answer
35 views

Filters in IR alarm circuit

Electronics student here, so i'm printing a IR receiver for a project of my school. I'm trying to understand the filtering part of the circuit. The signal is received through the BP104 photodiode ...
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1answer
44 views

What should be the source impedance and load impedance in LC filter design?

My aim is to generate analog signals with class-D amplifier. For that I am using the following configuration: Class-D-->Low-pass filter(LC)-->load(complex, real+imaginary) class-D amplifies my PWM ...
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2answers
353 views

Obtain an accurate DC value in an AC+DC signal

Background: My goal is to use an Arduino with two proximity probe sensors to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
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1answer
35 views

Superposition on a circuit with just one source

I'm trying to analyse this circuit (state variable filter): All the places on the web I've found solve it first using superposition, creating an equation of the form \$ V_2 = kV_1 + kV_4 + kV_3 \$. ...
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0answers
44 views

How do I decide upon the order of SINC filter for sigma delta modulator?

I have simulated a first order sigma delta modulator im Matlab simulink. The clock frequency of the modulator is 20Mhz (oversampling frequency). Now I am trying to convert a sine waveform (50Hz) to ...
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1answer
27 views

Drop on high pass filter measure

So I'm implementing an analog control scheme, and one important component is a first-order high pass filter. The source signal is the output of a shunt monitor (INA138 - in the circuit below the ...
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0answers
22 views

DWDM filter response

I have been trying to find an analytical expression of the frequency response of a DWDM filter, say at 40 GHz bandwidth. Any help would be much appreciated.
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1answer
65 views

Inverting Opamp on Noisy Ground. Would an LC filter help?

Alright, say I have this Inverting Opamp, but it so happens the positive input to ground is also connected with another sub-circuit that happens to produce a lot of noise (no pun intended): ...
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1answer
52 views

Filtering the output of an H-bridge

What's the best way to filter the output of a H-bridge? I have a PWM output at +/- 20 V and I want to get a 10V RMS sine wave out at 50hz Also is there a way to do it without inductors?
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2answers
74 views

Capacitor quenching circuit across Brush and Commutator of DC motor

To reduce the spark between brush and commutator segment there is capacitor and resistor spark quenching circuit is placed between each commutator segments. please find below images for detail idea ...
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2answers
91 views

Changing LC filter passband width

I am building a circuit that uses an LC bandpass filter (with the inductor and the capacitor in parallel between the signal and ground lines). However I am having a problem in that there is no way ...
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2answers
67 views

Calculating resistance and capacitance given the time constant

I'm currently conducting an experiment where I need to determine what a black-box component consists of. After measuring input and output voltage for various frequencies I have so far determined that ...
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0answers
63 views

EMI filtering at end of a long copper wire transmitting high DC power

I have a long (20 - 50 m) copper wire for supplying DC power. One one end there is a AC-DC converter supplying 600W-1000W of power at 60V output. At the other end I have a switching type (100-140 kHz) ...
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3answers
101 views

How to calculate resistors and capacitors values for analog RC filters?

How to calculate resistors and capacitors values for band-pass RC filters based on LM348 operational amplifier? In this example, 3.2KHz, 4.3KHz are standard center frequencies, that are individually ...
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1answer
60 views

Input RC filter design for analog pin of ADC

I am implementing ADC filter for AD7705 ( Sigma Delta ADC - Analog Devices Chip ). Input to ADC is constant DC voltage. So, what will be cut-off frequency I should consider to implement RC filter at ...
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1answer
71 views

Digital Low-Pass Filter When Oversampling Audio

The human ear can hear sounds up to ~ 20KHz. Some ADC's oversample. For example, to capture frequencies up to 20KHz, an ADC converter might sample at 160KHz. The steps are: 1. Filter the audio with ...
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1answer
75 views

High pass filter for I2C

I am building a gimbal and passing I2C through sliprings. Right now I have 1.6Vpp spikes at about ~32kHz on the i2c bus. (The spikes are harmonics from motors which are driven at 16~17kHz). The i2c ...
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1answer
67 views

Sallen-Key filter using LM358 doesn't act as supposed to when fed a 31.25 kHz PWM

I want to create an Analog Voltage by filtering a PWM signal. After some googling, I found an active low pass filter topology with -40db/decade called the Sallen-Key topology. I tried implementing a ...
2
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1answer
63 views

Function of Glass bead on EMI Filter Legs

I am looking at a PCB that has tiny glass beads on the input and output legs of an EMI filter. The middle pin goes to GND. What is the purpose of the glass beads? Couldn't get the focus quite right ...
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36 views

current feedback design

How do I select the current sensing resistor \$R_{56}\$ with following details: Feedback threshold voltage is 0.5V. DC input voltage 400V. AC output voltage 230V. output power is 500W. operating ...
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1answer
77 views

Filters responses

I got a filter and I want to examine whether it is stable or not. My system has the following TF $$H(s) = \frac{0,0001s^4 + 10s^2}{0,0001s^4+0,05s^3+10s^2+s+1}$$ So after plotting the zpmap (shown ...
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1answer
54 views

Filtering noise off of PWM signal

I am trying to measure the resistance of a nichrome wire that has a PWM (1000Hz and different duty cycles between 0 and 100%) voltage applied to it from a 5.0V regulator. The setup I have in mind ...
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1answer
50 views

Effect of AC coupling on DC signals

I am currently trying to amplify a very small AC signal that is riding on a high DC offset. In order to amplify the signal (using a simple op amp circuit), I obviously need to remove the DC offset to ...
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26 views

Sigma-Delta RC Filter

I am using a MSP430F427A to measure the voltage across a current shunt for coulomb counting stage of charge monitoring. Just looking at what kind of filter to put at the input of the SD16 ADC, and the ...
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5answers
552 views

How can I read the graph of a low pass filter

Given information I have the following circuit, and frequency graph. The capacitor is connected to ground at the bottom. Unfortunately the graph is in dutch, but it won't matter much. Just understand ...
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1answer
87 views

MOSFET Circuit: Bypass capacitor

Does anyone know how a Bypass Capacitor work in it's physical operation? How does a bypass capacitor filter out the ac signal in the device structure and physical operation?
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38 views

Understanding Baxandall's tone control ckt

I am learning to understand and design filters.. I was unable to design a ckt to control bass as well as boost (passive)... which would have transfer function (for boost) H(s) = (s+k)/s I came ...