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# Filter Equations

85 Threads found on edaboard.com: Filter Equations

## Output Filter Capacitor in SMPS

Normal Output voltage ripple formulae is \Delta V = \frac{\Delta I}{8fC} But many power supply design book calculate capacitor needed with respect to maximum output current. The result of these two equation will be very different. Please suggest how to calculate output capacitor filter for any forward converter.

## Filter PCB Track Impedance

the input and output impedance of filters should match the impedance of whatever they're connected to (in this case 50 Ω in and out) It's not the actual filter in- and output impedance but its designed or nominal impedance. The design equations of a lumped filter don't assume transmission line segments inside the (...)

## Filtering ECG signal

You first have to determine what are the artifacts that are polluting your signal, and then specify the filter requirements. In Excel you could use the VBA to do that, but as Tony mentioned you'll need an external tool to synthesize the equations.

## Nedd Help For Designing Ultra Wide BandPass Stripline Filter

Hi there, i need some book or article for earning synthesizing equations or methods for designing a stripline band pass filter 1-2 GHz. it is urgent, can any one help me plz?:bang:

## Frequency Warping Filter coefficients, Binomial formula

Hi friends, I am reading a paper on frequency warping and I need to do a little manipulation of the z transform. Can somebody help me on how can I go about deriving equations 3 and 4 from equations 1 and 2 in the figure. Thanks in advance 105906

## Any drawbacks of using very thin lambda/4 open microstrip line in harmonic filter?

A microstrip notch made by a thin L/4 line is not very consistent in production when try to reject a carrier, because small variations in the PCB process will change the notch frequency. Meantime, a thin microstrip line is actually an inductor (see online for equations) and this can be helpful in microwave frequencies making a low pass filter just

## How trigonometric ratios fit into equations when dealing with sinusoidal waves

I am not sure if this answers your question: Sinusoidal signals can be expressed by exponenetial functions like Vin=Vo*exp. If such a signal is applied to a frequency-dependent network (filter, amplifier) the output will change in magnitude and phase like Vout=A*Vo*exp. Thus, the gain is Vout/Vin=A*exp.

## difference between kalman filter & extended kalman filter

Hi all,, What is the difference between kalman filtering and extended kalman filtering channel estimation...can nyone tel how they differ in their equations..i would also like to know the differences in formulating matlab codes for them...for sinusoidal wave as input, is an extended kalman filter must? Thank (...)

## kalman filter and extended kalman filter difference

can anyone please tell me the difference between kalman filtering and extended kalman filtering channel estimation....i would mainly like to know the differences in formulating matlab codes for both.....and also about how they differ in their equations..... for giving sinusoidal wave as input, should we use an extended kalman (...)

## Sallen-Key LPF frequency scaling factor

My questions are am I in the correct path and what is the effect of the frequency scaling factor (FSF)? The FSF is 1 for Butterworth but for Bessel and Chebyshev it has an effect. Why is that? The equations for filter dimensioning are based on pole locations (pole frequency Fp and pole Q). However, the user normall

## channel estimation with kalman filter

i want to do channel estimation using kalman filter. this is the matlab code i formulated using the equations. the noise added is gaussian. but the problem is that i am getting a constant error instead of error getting reduced with the number of iterations. can anyone please help me to find the correction needed in this... its urgent..if anyone ca

## Bandpass filter help!

I have this filter, i've tried many times to get the transfer function, but i always get it wrong... Here are the equations i'm using: (Vin-V1)/R1+(V2-V1)/R2+(V3-V1)/R2=0; V1=R3Vout(R3+R4); V2=-VoutR2*sc; V3=-Vout/R2*sc; if anyone could give me a hint of what am doin wrong, it would be great.

## Resolution of a sigma delta modulator

Don't forget a very important fact, that in making higher order modulators, you need to consider coefficient scaling within the loop filter for stability. If using a single bit internal quantization, you will never match the calculated values by the commonly used equations! It only matches for first order. If you go to multi-bit, you will match

## what is gabor filter equation

hai i need your help in my project i.e disease detection using gabor filter . i dont know any thing about gabor filter. initially i want to know what know what are input of gabor filter ,equations and code . so, please help.

## How to filter known aliased signals?

How?? Has anybody heard of this or done it before? If so please lead me to the resources or tell me how to do it. I know it's not usually done, but this is a very special case where I know the aliased frequency and the magnitude. I also was suggested to use the mathematical equations directly but I am not sure which ones. If any one experienced

## Band Pass FIlter Problem

In both cases, the second filter loads the output of the first filter, changing it's characteristics. To minimize that effect, the impedances of the second filter should be much higher than the first filter. Your high-low filter gets that right (1K>>200 Ohms). To improve the low-high filter, (...)

## difference equation: filter design

Hi all: I have a very basic question about difference equations. I seem to be going in circles trying to find the answer online. 1. if someone asks you to obtain the difference equation of a low pass filter with cut of freq say 60Hz, how would one go about doing it? Once you get the difference equation you can write the software, but I just c

## Low Pass RC filter with input transient

Dear Jonny Hi Ic= c(dv/dt) and you can get the voltage : ic*dt=c*dv ...> dvc=(ic/c*dt) ...> vc = 1/c integral (ic dt) . And at square wave and DC , we can say : Vc(t) = vs-(vs-v0)e^(-t/RC) With top considerations you can analyze your filter , simply. Best Wishes Goldsmith ---------- Post added at 17:21 ---------

## Convert lumped two-stage cascaded lowpass L-type filter to distributed transm. lines

Hello, I am currently trying to convert a two-stage cascaded L-type filter into transmission lines. I have found a way to this problem, but I´m somehow not able to figure out how to use the equations to get the job done. Link for the problem: ImageShack? - Online Photo and Video Hosti

## Need Help to Design a Microstrip HPF for Complementary Diplexer

Hi, I am trying to design a microstrip complementary HPF (High Pass filter) for my diplexer design. I have already designed the LPF section for that diplexer in microstrip using Pozar's equations. But, I am getting problem to design HPF. I am using a series capacitor as a first component in my design as I have restriction to use a parallel componen