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218 Threads found on edaboard.com: Even Odd

## Typical differential input impedance for IC

You have to understand mode decomposition, even(=differential) and odd(=single-ended). If you consider only even mode, signal source impedance should be 25ohm as singled-ended, this is equivalent to floating source impedence of 50ohm as far as concering even mode. These concepts are linear, so it is not difficult to (...)

## Odd/even impedances simulation for a not typical structure

Hi Eres_89, You mentioned that you have calculated values for Zoo and Zoe. How did you determine the modes ? For example, for odd mode: You have fields coupling between the top two traces. Similarly,for the bottom traces - Fields going from the center signal line to near by grounds. What about even modes ? If you know how many modes are propaga

## Characteristic Impedance of Differential Transmission Line

Differential Transmission Lines have 2 impedances.even mode and odd mode.The characteristic impedance of a differential lines is composed of these two mode dependent characteristic impedances.For more information, "RF and Microwave Coupled-Line Circuits", Inder Bahl, Prakash Bhartia,Rajesh Mongia. Artech House

## Even and Odd mode velocities in quasi-TEM

Hi How can I calculate even and odd mode velocities in quasi-TEM mode for transmission lines?

## 8 point radix-2 DIF FFT (Sande- Tukey) algorithm

Hello, I have a project submission on DIF FFT in C code. I have tried so many things but can not get the code to work. #include "fft.h" int fix_fft(fixed fr, fixed fi, int m, int inverse) { int mr,nn,i,j,l,k,istep, n, scale, shift,twid; fixed qr,qi; //even input fixed tr,ti; //odd input fixed wr,wi; //twiddle factor f

## harmonic in the EMI side of a microinverter

What is the effect of harmonics in the EMI filter? odd harmonics? and even harmonics?

## How to find even and odd eigenmodes using CST eigenmode solver or by other means

Hi, I was trying to find the modes of a symmetric photonic crystal based waveguide. The eigenmode solver of CST is doing nice with my requirement but in many publication people are getting even and odd modes within the band gap for a symmetrical structure. I am a bit confused that, do I have to do something to get both the modes or it is the jo

## How to remove ripples from Chopper stabilized Opamp?

Hi, Basic idea of chopping is upconverting signal to the odd harmonics of chopping frequency. However, due to the fi nite bandwidth of the ampli er, some unwanted spurs emerge at even harmonics of the chopper frequency. You should filter them out. One good referance paper about noise suppression of these circuits is the Enz's famous paper which is

## Interdigital Bandpass Filter - Design procedure (Lancaster)

Hello, I am following the design example of an interdigital filter with symmetric coupled lines as given in Microstrip Filters for RF-Microwave Applications (Lancaster), page 141. I managed to calculate the characteristic impedances in even and odd-mode and, consequently, the coupling coefficients. My struggle is to calculate the spacing betwee

## Differential probe & measurements

A pure sinewave has extremely low distortion (any kind of distortion) because it has no harmonics, it just has the fundamental frequency. You can see distortion (even harmonics, odd harmonics, clipping or crossover) if the fundamental frequency is reduced or removed by a notch filter. Differential probes have nothing to do with it and are not used.

## CMOS inverters used as drivers

From reviewing your photo, it appears your signal is ~526 MHz with 45% duty cycle and thus even harmonics as strong as odd harmonics up to 3~4Ghz 1) Asymmetry is could be improved. 2) don't worry about peaks IF you are not worried about 1) . This is normal for asymmetry drive impedance and non-linear C load. 3) if 1) is a problem use

## even and odd signals

Counterquestion: Why do you pick-up a single sentence from the chapter about symmetry properties of fourier transformations instead trying to understand the meaning of the chapter? Decomposition is a mathematical method, it's purpose doesn't depend on the existence of the pure even/odd functions in natural signals, although you surely find some

## Effect of impedance mismatch on ac response

To elaborate chuckey's comment. The first picture seems to show a short piece of 75 ohm transmission line in a 50 ohm system. You get no reflections if the cable length is an even multiple of λ/4 and maximum reflection if it's an odd multiple. Very basic RF engineering. P.S.: I see volker@muehlhaus already showed the same effect with 25

## tcam memory parity bit generation for parameter extractor

please any tell me, whether parity bit calculation possible in tcam memory parameter extraction.. i.e., xor operation can perform unknown x(either 0 or 1) value. another one is, if binary word has unknown term we can say that word is even or odd parity?

## help me on CC2500 Interfacing with PIC controller

i have found that, when i write an even no data(eg: 0x02) to a reg of cc2500,i got output always 0x0F when i read same reg. And when i write an odd no data(eg 0x05 (00000101) ) to a reg, i got output one bit rotated 0x82 (10000010). Thanks in advance.

## Single balanced mixer topology without transformer

Normal diode mixers use unbiased diodes, but in case that small DC bias current is used, the conversion loss can be reduced, if is not available high level signal from oscillator. Also DC bias (adjustable) can be used in a diode type harmonic mixer, to make an "even only" mixer operate with odd LO harmonics, or an "odd only" mixer operate (...)

## input impedance of coupled line

Input impedance is function of odd and even mode impedances of coupled lines.Therefore you should find these impedances first by calculating or simulating. You can read something about those in Bahrtia's book.

## Doubts on harmonics, first order harmonics,2nd order harmonics, 1st order power

Dear Sir, What is the meaning of harmonics. What is first order harmonics , is third order harmonics. What is even order and odd order harmonics. What is fundamental order harmonics What is the fundamental power What is the third order power.

## Seeing UART data in Oscilloscope

hi vikky, The usual causes of corrupt RS232 data are in the Baud rate settings not being the same or the Parity Bit ie: even or odd or Off. On your scope you should see for each character, a 10 bit long string, 1 Start bit, 8 data bits and 1 Stop bit. On the PIC pin its a TTL level and the output of the MAX232 +/-9V level. If you can sync your

## HFSS directional coupler

Hello, I need some help in design a directional coupler, I got the results in MWO but they does not match in HFSS, any one know or have a file about special condition to design Directional coupler coupled line in HFSS please help and I know to see the even and odd mode but I don't know how or calculate the even and odd impedance

## Uart serial communication 9600n71

I have to receive data from a Device through RS232 using 9600 Baud, NO parity,7 Data bits and 1 Stop bit. The Device is Pre programmed to select different Baud rate, odd/even/ NO Parity, 7/8 Data bits and Fixed Stop bit as 1. My project uses 89C52 controller and setting the serial port (SCON) mode to 1 (9bit) I am able to receive the data with

## Uart serial communication 9600n71

I have to receive data from a Device through RS232 using 9600 Baud, NO parity,7 Data bits and 1 Stop bit. The Device is Pre programmed to select different Baud rate, odd/even/ NO Parity, 7/8 Data bits and Fixed Stop bit as 1. My project uses 89C52 controller and setting the serial port (SCON) mode to 1 (9bit) I am able to receive the data with

## "First Harmonic" .. "Second Harmonic" ?? Hmm..

Hi again, the even harmonics are tolerable and sometimes pleasing to the ear... whereas the odd harmonics are grating. Not always odd harmonics are grating. In clarinet and bassoon, for example, odd-order harmonics are dominant and are essential for giving them their characteristic sound. Several (...)

## third harmonic in sigma delta modulator's output spectrum

There are different sources of non-linearity in a SD-modulator. The assumption, that you mainly see odd harmonics is of course based on prerequisites, generally speaking no even terms present in the polynomials describing the transfer characteristics of individual building blocks. There's a paragraph about distortion in the simulation chapter o

## Fully differential Folded Cascode op amp bias

Your schematic software is an odd-looking negative and its text is too tiny to read even when enlarged.

## Metal filling insertion

Some designers used the metal filling to "improve" and meet the IR drop/resistivity target by connecting the metal filling to power nets, for example odd layers to ground and even layers to supply.

## Alternate clock edge detection

Rising edge triggered D type and two and gates? D type wired as a divide by two with the Q and *Q outputs anded with the clock to give even and odd outputs that are the same width as the clock (There might be a slight glitch due to the prop. delay of the D type). Nick deans circuit does not match the clock timing and in any case if that is al

## What is EM and it effects?

Electromigration, is it due a high current during a long time, which will move physically the metal, up to open the power net. To solve that, made a good flooplan which well design power nets structure. Some one used the metal filling connected to power nets (for example odd layer to ground and even layer to supply) to reduce the resistivity and

## Microstrip Coupled line impedance matching

Your calculations is not exactly correct.odd and even mode impedances are valid only and only if there are 2 coupled lines.But if there are more than 2 coupled lines like in your filter structure , it's hard to say that formulae will still be valid in any case.You forget other interactions between-for instance- first element and kth element.

## ways to determine odd and even count values in VHDL

To detect odd and even, the simplest way is check the LSB. Without posting your real code, it is difficult to see what you mean. The code in the first post uses an integer which is a signed value. As for fractional numbers, you can use unsigned without a problem - you just need to keep track of where the fraction/separation is.

## Inverting and non-inverting inputs of cmos opamp

If you are talking about the circuit, then you go from the input to output stage by stage and count all the signal inversions. An even number is the non-inverting input and and odd number is the inverting input.

## Even and Odd-mode Wilkinson power divider

Remember the following points 1. The conventional Wilkinson power divider is a narrow band device. So fix your frequency band of operation and try to optimize within those constraints. It would not be fruitful to try for anything over 20% bandwidth of operation. 2. even if you assume no loss in the resistors, the maximum you can reach for |S12|,

## MSI 945 motherboard rebooting problem.

It restarts itself i have checked with new smps and with removing all other components like hdd odd drives it restarts even in bios menu no burns or bulged capacitors are found on motherboard pls help to troubleshoot.

## matlab help to read a textfile

filename = 'xxxx.txt' data = load(filename) data_bin = dec2bin(data) ... after that you can access by array indexing.. data_bin(i,end) is the first bit of the i-th value (located at index i).. or you can use mod(data(i), 2).. which gives whether the value is even or odd.. even means first bit is zero.. odd means (...)

I've been trying to design a coupled mircostrip line coupler with only 2 ports. I know all about the even and odd modes and the rules that i need to satisfy to achieve the best coupling but i couldn't find any sources on how to actually design and construct the line. I have build the line in HFSS but the coupling isn't there to a satisfactory level

## Parity generation code

I this syntax for generating parity correct ??? input data; output parity ; assign parity=^(data); Strange behavior ..giving mixture of odd and even parity. Here's the result. data parity 00 0 01 1 10 0 11 1 it should be ok - something else you are d

## Problem Phase-shift Diffrentiator

Hi there, I have a problem with the phase of my differentiator. I designed it with two methods (frequency sampling and Remez algorithm) in Matlab (fir2 and firpm) when I use a filter types with odd-order everything is right. If I take one with even order I had a phase-shift between the input and the output which dependet on frequency. altho

## can anyone provde me the code for audio effects using tms320c6713 dsk

The fuzz effect can be obtained by clipping a signal. If you do this with solid-state devices the raw result is grating on the ears, due to generation of odd harmonics. However by using tubes (valves), the sound is more listenable, because the harmonics are mostly even. (According to articles on the subject.) To make a single echo, add a duplicate

## How a branch line coupler physically works?

Hi I am unable to understand how a branch line coupler works physically. By scattering matrix or even-odd mode it seems ok, but any physical explanation?? I got some explanation as follows: If port 4 is terminated the port 1 will be matched and the power equally divided between port 2 and 3 because both have same impedance Z0. and phase differenc

## center frequency of a signal

dear; what is the signal bandwidth? if it is even then fc= bw/2 and if odd fc=bw/2+1. Savor, Best.

## "Rat-Race" and Wilkinson combiners question.

Hi Darktrax, Yes. The two signals must be in phase in order to add into the in-phase port, or in counterphase in order to add into the other port. If the two voltages are V1 and V2, the outputs at the two ports are (V1+V2)/sqrt(2) and (V1-V2)/sqrt(2) (even- and odd-mode respectively), when "+" and "-" are vector operators. Regards Z

## Even- and odd-mode characteristic impedance design data for symmetric coupled...

Hi there I need even- and odd-mode characteristic impedance design data for symmetric coupled microstrip lines on a substrate with various Er. I found a design graph in Pozar's Microwave Engineering book, but it's for Er=10, I need design data for instance Er=4.6. Where can I find sth like this, can anybody help me? thx

## Power amplifier class E & F

Class F amp in microwave Design involves a matching network design at the fundamental frequency and load harmonics. The common practice is to present a short circuit at the even order harmonics, and an open circuit at the odd order harmonic. This 2nd and 3rd harmonic is usually adequate. Thus the gate voltage will be out of phase with drain curre

## designing a moore fsm for even no of zeros and odd no of ones

You can do this with 4 states: even #0's/even #1's, even #0's/odd #1's, odd #0's/even #1's, and odd #0's/odd #1's. From there you can figure out the state transitions and outputs.

## Coupled Line BPF Problem

Hi all, I am designing a coupled line microstrip BPF with center frequency of 1.67 GHz. The ideal simulation (with even and odd impedances) is great but when I shift to use microstrip lines, the response is worse. The point is that the filter response is such that it passes the frequencies in the range of double of its p

## ROM contents confusion

You can use the 7th bit (probably the LSB as it's odd/even) to select which ROM output to use.

## Microstrip lines filter

Hi U need to calculate the even and odd mode impedance of each coupled line. You can then use the ADS LineCalc tool for getting the gap, length and width. Regards Twisha

## How to implement lifting based DWT in verilog?

Im currently doing a project in DWT lifting scheme. Can anyone give me an idea of hw to split the image into its even and odd components and finally process them in column and row filters.

## How can write at MATLAB

FOR n=1:Inf 1- How can i write K for even no. and odd no. on MATLAB hint(k=0:2n) ?? 2- How can i write S=σ+jω on MATLAB ?? 3- How can i write L(-S?)=(k=0)Π(2n) on MATLAB ?? 4- How can i write H(S)=(i=1)Σ(S-Pi) And How define this Poles(Pi) on MATLAB ?? THANKS FOR EFFORTS, odd=1:2:20