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# Filter Equations

85 Threads found on edaboard.com: Filter Equations

## Output Filter Capacitor in SMPS

Bulk energy storage (rms ripple) is one factor, but parasitics can bring you undone where voltage spikes on the output can be problematic. A very modest second stage LC filter with a much higher cut off frequency can be very effective. I really like that calculator trees, I seem to be forever doing those calcs.

## 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

## How to simulate the parasitic passband of the low pass filters?

Hi, I am simulating a down-converter system in ADS. The schematic simulations allow to use the lowpass filters, without no parasitic passband feature, which is not the fact. How can I set the parasitic passband feature of the low pass filters in the ADS schematic, just use the if else equations? For example, a butterworth lowpass (...)

## How to calculate the third order distortion of the cascaded components? Any equations

I am designing a receiver. In a traditional way, I use two mixers and three ampllifiers. The OIP3 of the amplifiers is +27dBm, and IIP3 of the mixers is about 18dBm. The simple structure of the system is something like the mixer->amplifier->filter->mixer->amplifier->amplifier->filter. The level of the mixers is about -30dBm. So the third order out

## Acoustic echo cancellation using LMS equations

Gd eve, I am doing my B.Tech final year project on "ACOUSTIC ECHO CANCELLATION ALGORITHM TOLERABLE FOR DOUBLE TALK" here im having a code by using direct adapt filter but i need to submit the code using LMS equations... i have added a sine signal with a random noise ..but can't go further.. so, please anyone help me by providing me the code or e

## Need help for mean genetic algorithm for(GA)

i mean genetic algorithm for(GA) i need to goldberg book this book if i found i will good but this book is no available and i want form you this book. plz help me in my resrch . how can i deal with equations non-linear in genetic algorithm for design filter with no using pareto . plz plz plz help me..

## Finding number of reactive elements in interdigital filter

hi everybody... I have an assignment on the fabrication of interdigital filter.I studied equations for designing filter.But i could not understand how to calculate the number of elements to be used in interdigital filter.There is a equation to calculate n such as LA(dB)=10log10(1+\\epsilon (w'/w1')^(2n))..I have the (...)

## Fitering without using Matlag filter fuction

Write your own filter function using the difference equations given NUM & DEN.

## derivative estimation filter for peak detection

hello everyone i need the equations of first and sec derivative of Gaussian filter for peak detection of brain stem response signal .. plz help me in this concern......

## synthesis of the equation

hi guys i have designed microstrip ring resonator filter and the result was in good agreement with the fabricated filter ... i need to synthesis the equations of the proposed filter so anyone has any idea helps happy new year for everyone

## clean FFT for Class-D simulation

what's the cut off of you 3 rd order filter? strobeperiod does not have anything to do with simulation accuracy. However, maxstep has. By decreasing maxstep, you are forcing the simulator to solve the equations more often (even though it might not be required because of lack of transitions). In this case, you must first determine how much pulse

## Current Distribution analysis in Microstrip line Using ADS

While analyzing the current distribution using Agilent's ADS..for filter designed using micro-strip line...how to interpret it... If any equations related to this analysis then let me know so that i can explore more on that....

## Barkhausen's Criteria in high order active filter design

Dear all, I want to ask a simple question: Why high order active filter can violate Barkhausen's criteria? For instance, if want to design a third-order low pass active filter, there will be three integrators in the loop. In other words, the phase margin is easily less than 0 degree. When we design an active filter, we merely

## Help!! LC filter for Chopper

It is unclear what point the scope simulation plot is of. It appears to be related the MOSFET output chop voltage. It is definitely not a plot of coil current. If you are looking for battery ripple current you are going to have to put in representative resistance of output filter cap and battery Rs resistance. You should also put in coil resi

## AWR MWO - Microwave Office - MATRIX syntax/definition

Hello Sirs I'd like to do following in MWO: I have filter with switched C. C are switched by PIN DIODES. Vector SW is vector for ON/OFF PIN Diodes. I have 4 diodes. So it is possible to have 2^4 combinations = 16 SW={1,1,1,1} next SW={1,1,1,0} So I'd like to define MATRIX of SW commbinations called for exmaple X :) X= 1,1,1,1

## how can i use kalman filter to combine outputs of sensors?

The matrix equations of a kalman filter allow for multiple inputs. Each has its own "weighting" that the filter eventually solves. Get a good kalman filter book!

Hi everyone, I'm a master student of Government Technological University(Thanlyin) , Yangon, Myanmar. I want to ask equations about my thesis. My thesis title is "Design and Implementation of DSP based Active and Passive filter synthesis Using Matlab". So , How do my thesis start ? Please give me any ideas. Thanks for all.[

## Monte Carlo analysis for lumped RF filter

In filter synthesis block, there is a "sensitivity analysis" tab, if use this tab, ads will give you the sensivity or in otherwords the statistical filter response causing by component variations.

## Passive audio filter for piezo pickups -- Simple question

I would say you really need to buffer the piezo signals first. A simple opamp buffer (or even an emitter follower circuit ) is all you need. Then you could use the passive filters. Mind you, if you are going to put an opamp in there, you may as well make it a non-inverting, high impedance input active filter! I would suggest a simple 2 pole fil

## Looking for SMPS with EMI Filter design criteria

I am trying to build one SMPS with EMI filter. Can anybody give me the design equations and design criterion s of the filter ?

## Looking for elliptic filter design

Can anybody post close form design equations for elliptic filter here. Thank you.

## W(width) L(length) S(spacing) Coupled-Line Band-Pass Filter

This is complex problem, irst you need to freeze the specification, find the approach filter type and then order, then target for WLS for each finger.

## Help Identifying Filter & Governing Equations

I'm currently trying to make a few line traps and have been doing a little reading. I found that these guys used a T filter with some lumped element components. They didn't describe how they did it so I'm a little confused. I am trying to block a range of frequencies. They blocked 1 MHz to 10 MHz (they get high attenuation in this band). I want

## Boost converter equations

Thank you for the answer. I don't use any output filter in order to keep bandwidth capability of the boost converter, tha's why I need to optimize the output ripple according to L & C values.

## Filter for an inverter circuit

Hello all, I need to design an output filter for the inverter circuit. The DC input voltage is around 20kV DC and the input current is 6000Amps. I want a sinusoidal voltage at the inverter output to be 20kV AC. I do not have much knowledge in this Power Electronics area as Im much into Power system Engineering. Can you kindly help me designing

## harmonic suppression in hairpin filter

Put the notch stub at both ends of the filter whose freq is at 2nd harmonic of the filter

## Filter designing - need the complete procedure

can anybody give me the complete procedure to design the microstrip square open loop resonator BPF using ADS with required equations.

## Filter Measurement - calculating parameters of resonator

how to calculate the parameters of square open loop resonator.plz specify the equations.

## clarify my doubt plzzzzzzzzz

hi to all, i have the design equations of the inter digital filter , how can use these equations for the combline filter design , is there any equations are modified for the combline filter. if both filters can use the same equations, plz tell me (...)

## About Charge Pump and VCO

Hi Mouzid, please do a google search for "Fuding Ge pll thesis" There you will get this thesis. Yes the loop filter needs to be designed so that the PLL locks to the input frequencies.You will find the standard design equations in any design book. Amarnath

## Re: coupling bandwidthin combline filter

hi im sorry so much of matter is missed here , i want to know the relation between coupling band width and coupling coefficient in combline filter design which mentioned in thsis article i got this from the forum ift seems but i couldn,t understand how to calculate ke, cfe,cg,ze,zo values and also i calculated the k(i.j) valu

## round rod combline and interdigital filter design

Hello mallelauma, Attached are the requested documents on Combline filter design... Design equations for Tapped Round Rod Combline and Interdigital Bandpass filters ---manju---