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84 Threads found on edaboard.com: **Filter Equations**

I realise that for maximum power transfer, the input and output impedance of **filter**s should match the impedance of whatever they're connected to (in this case 50 Ω in and out). My question is, should the PCB tracks between the Ls and Cs, that make up a complete **filter**, use track widths that equate to 50 Ω? My thought is that if you foll

RF, Microwave, Antennas and Optics :: 09-20-2016 03:17 :: HardwareChap :: Replies: **1** :: Views: **148**

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**.

Digital Signal Processing :: 04-06-2016 12:45 :: andre_teprom :: Replies: **4** :: Views: **493**

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:

RF, Microwave, Antennas and Optics :: 09-11-2014 05:01 :: ehsan_faal :: Replies: **1** :: Views: **429**

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

Digital Signal Processing :: 05-31-2014 04:57 :: electronicengr :: Replies: **0** :: Views: **574**

Simulation shows that the thinner line is, the wider band would be **filter**ed around lambda/4 center frequency. Is anything wrong with this approach? I mean make this line really thin, almost like for DC signals. I want to **filter** out fundamental using this approach, without using microstrip/hairpin **filter**.

RF, Microwave, Antennas and Optics :: 02-23-2014 05:25 :: Terminator3 :: Replies: **1** :: Views: **760**

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.

Mathematics and Physics :: 02-06-2014 07:03 :: LvW :: Replies: **3** :: Views: **637**

Hi all,,
What is the difference between kalman **filter**ing and extended kalman **filter**ing 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 (...)

Digital Signal Processing :: 05-15-2013 02:41 :: Lekshmi B S :: Replies: **0** :: Views: **727**

can anyone please tell me the difference between kalman **filter**ing and extended kalman **filter**ing 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 (...)

Digital communication :: 05-13-2013 05:28 :: Lekshmi B S :: Replies: **0** :: Views: **555**

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

Analog Circuit Design :: 05-13-2013 03:49 :: LvW :: Replies: **1** :: Views: **601**

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

Digital communication :: 05-02-2013 01:14 :: Lekshmi B S :: Replies: **0** :: Views: **561**

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.

Elementary Electronic Questions :: 04-25-2013 05:51 :: JMAS :: Replies: **0** :: Views: **355**

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

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 02-28-2013 03:30 :: jgk2004 :: Replies: **4** :: Views: **495**

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.

PLD, SPLD, GAL, CPLD, FPGA Design :: 12-12-2012 00:55 :: gsomesh :: Replies: **2** :: Views: **740**

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

Digital Signal Processing :: 07-16-2012 18:24 :: EE112 :: Replies: **1** :: Views: **463**

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**, (...)

Analog Circuit Design :: 05-02-2012 19:54 :: godfreyl :: Replies: **8** :: Views: **989**

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

Digital Signal Processing :: 03-12-2012 01:22 :: dom045 :: Replies: **1** :: Views: **740**

A first order RC low pass **filter** has a first order differential equation.
C=22?F
R=1kΩ
68297
Vout+ VR= Vin
68298
If the input voltage is a transient Vin=5e -100t , does this remain a first order differential equation?

Elementary Electronic Questions :: 01-30-2012 07:07 :: jonnybgood :: Replies: **11** :: Views: **1345**

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

RF, Microwave, Antennas and Optics :: 01-17-2012 14:49 :: yxcvbnm1234567890 :: Replies: **0** :: Views: **552**

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

RF, Microwave, Antennas and Optics :: 11-09-2011 20:06 :: snali :: Replies: **0** :: Views: **780**

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

Electromagnetic Design and Simulation :: 10-10-2011 06:59 :: saulbit :: Replies: **0** :: Views: **761**

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

Analog Circuit Design :: 06-19-2011 22:48 :: saulbit :: Replies: **1** :: Views: **905**

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

Digital Signal Processing :: 03-18-2011 15:47 :: revanthkumarg :: Replies: **1** :: Views: **1531**

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..

Heuristic methods, Machine Learning, AI, and Soft Computing :: 02-02-2011 02:41 :: kokor :: Replies: **0** :: Views: **1016**

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 (...)

RF, Microwave, Antennas and Optics :: 01-12-2011 12:12 :: P.kayalVIZHI :: Replies: **0** :: Views: **672**

I have a task i need to do but i'm not sure how to **filter** the signal without using Matlab **filter** function. Here is the code of the **filter**:
L =8;
x1 = ;
%Input Signal
x = ;
figure;
subplot(2,1,1);
stem(x, 'g');
title('Input signal in time domain');
X = fft(x,L);
SX = abs(X);
%le

Digital Signal Processing :: 01-06-2011 13:34 :: Sovaa :: Replies: **4** :: Views: **610**

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......

Digital Signal Processing :: 12-21-2010 02:26 :: jyothib86 :: Replies: **0** :: Views: **769**

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

Electromagnetic Design and Simulation :: 12-21-2010 01:06 :: sameh1985 :: Replies: **0** :: Views: **1054**

Hi, how to get a clean FFT in Class-D simulation? I start from ideal model and want to slowly build in non-idealities and see the effect on Class-D performance. So with simple 384khz PWM Class-D with third order output **filter**, I aim for aliasing below -100dB (so can see all distortions greater than this), and so need 46.6x oversampling. So I use 20

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 12-02-2010 18:38 :: ansu_s :: Replies: **5** :: Views: **1113**

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....

RF, Microwave, Antennas and Optics :: 11-24-2010 07:42 :: sandesh564_123 :: Replies: **0** :: Views: **1125**

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

Analog Circuit Design :: 11-12-2010 03:08 :: LvW :: Replies: **2** :: Views: **1010**

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

Power Electronics :: 11-06-2010 12:04 :: RCinFLA :: Replies: **2** :: Views: **693**

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

Software Problems, Hints and Reviews :: 10-14-2010 04:51 :: deepi9or :: Replies: **2** :: Views: **1207**

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!

Mechanical Engineering and Design :: 09-14-2010 21:39 :: biff44 :: Replies: **2** :: Views: **1940**

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.[

Analog Circuit Design :: 08-16-2010 15:16 :: LvW :: Replies: **3** :: Views: **928**

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.

RF, Microwave, Antennas and Optics :: 07-05-2010 13:35 :: BigBoss :: Replies: **3** :: Views: **1515**

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 **filter**s. 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

Elementary Electronic Questions :: 06-07-2010 02:59 :: keith1200rs :: Replies: **6** :: Views: **3120**

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

Analog Circuit Design :: 05-16-2010 00:50 :: vinodquilon :: Replies: **1** :: Views: **2208**

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

RF, Microwave, Antennas and Optics :: 04-19-2010 02:46 :: g86 :: Replies: **1** :: Views: **1074**

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.

RF, Microwave, Antennas and Optics :: 04-01-2010 06:48 :: kspalla :: Replies: **4** :: Views: **2874**

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

RF, Microwave, Antennas and Optics :: 03-25-2010 16:22 :: infinite_gbps :: Replies: **1** :: Views: **575**

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.

Power Electronics :: 02-08-2010 04:10 :: jayce3390 :: Replies: **4** :: Views: **3514**

what cut-off frequency of your **filter** do you want? fix the C value to something you can buy and then design for L. that is your first iteration.
i assume you are talking about 3-phase circuit. so be careful as there are 3 inductors and 3 capacitors.. but typical **equations** for cut-off frequency is considered as line-to-netural. your other pha

Power Electronics :: 11-21-2009 17:06 :: Mr.Cool :: Replies: **11** :: Views: **2841**

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

RF, Microwave, Antennas and Optics :: 07-08-2009 08:14 :: kspalla :: Replies: **3** :: Views: **938**

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

RF, Microwave, Antennas and Optics :: 06-30-2009 02:40 :: umair67 :: Replies: **0** :: Views: **802**

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

RF, Microwave, Antennas and Optics :: 06-29-2009 02:48 :: umair67 :: Replies: **0** :: Views: **629**

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 **filter**s can use the same **equations**, plz tell me (...)

RF, Microwave, Antennas and Optics :: 04-21-2008 01:19 :: mallelauma :: Replies: **0** :: Views: **610**

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

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 04-18-2008 07:26 :: amarnath :: Replies: **5** :: Views: **1141**

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

RF, Microwave, Antennas and Optics :: 04-12-2008 00:14 :: mallelauma :: Replies: **1** :: Views: **769**

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

RF, Microwave, Antennas and Optics :: 04-01-2008 01:45 :: Manjunatha_hv :: Replies: **2** :: Views: **1855**

hi
i need design of interdigital **filter** with round rods. i have one paper from this site only but the **equations** for capacitor values are not there. can any body give me the whole design **equations** for this **filter** plz.
thanks

RF, Microwave, Antennas and Optics :: 03-29-2008 03:07 :: mallelauma :: Replies: **0** :: Views: **839**

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