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# Equal Length

85 Threads found on edaboard.com: Equal Length

## VHDL - native log2 and ceil for value 1

Hello, Using the combination of log2 and ceil - one can determine the vector length to store n number of addresses. number_of_bits := integer ( ceil ( log2 ( real ( number_of_addresses ) ) ) ) ; But this works well only when "number_of_addresses" is equal to or greater than 2. For the number_of_addresses = 1 - The abov

## Port refinement, process hf3d error: Port 2 is assigned to an internal face. Only al

create a rectangular box of width and length equal to the port dimensions, give thickness of 35 microns. finally assign material as PEC.

## comparing unsigned numbers

Some developers will also compare std_logic_vectors of equal length using greater/less. The comparison is done lexically, which matches a comparison between unsigned values. But only when the values don't have 'Z' or 'X' or etc... and are of equal length. Unless you're using the non-standard std_logic_unsigned

## How does a DFB (Distributed Feedback Laser) laser diode work?

in a laser, the light quantity increases with each pass thru the material. It has to do with electons turning into photons, etc. SO, if you have a standard diode laser, you just cleave the rectangular shape of it so that the wavelength of the long side is approximately equal to the physical length. THEN you can have light of the correct (...)

## VHDL Time Delay Problem?

If you want to have delay in vhdl without "wait" statement, see this post. Another way to implement wait statement for is, by implementing a RAM based shift register. The length of RAM should be equal to (REQUIRED DELAY / CLOCK PERIOD).

## contradiction in coil dimensions in this drawing of wire collinear by G-7RGQ.

Wounding a certain length of wire into a coil won't make a phase shift equal to the wire length. This is due to the EM field coupling involved, which can lengthen or shorten the time delay.

## degrees in resonator filter

I presume you are talking about transmission line filters. The length can be expressed in fractions of a wavelength at the center frequency, e.g. λ/4 is equal to 90 degree.

## not equal phase feeding of patch array elements, what would be S11?

I am reading paper about beam steering. I tried to simulate two patch array with parallel feeding. If patches have equal phase, S11 looks good. But if i add feeding line length for one of the patches, then there is very strange result in s11, it becomes worse, less than 10dB magnitude. Although current distribution seems good, just not inphase. Am

## reflection of electromagnetic wave

I understood you have to calculate the length L of a coaxial transmission line at wich the input impedance is a short circuit when it's left open at the other side. at a length equal to a quarter wavelength (and it repeats every rotation of pi) an open circuit at a side of a line will be seen as a short to the other side (...)

## Interdigitated Capacitance in HFSS

Have you tried modelling as line (equal to the physical length) with series C? I would simulate two lines of half the ICAP length, and use these S-parameters for de-embedding the line length from the ICAP data (cascade inverse of half length each from left and right side). Then, the remaining response (...)

## Floquet Port Problem

I could not able to figure out the following error Port 'FloquetPort2': The exterior boundary of the faces for a Floquet Port must consist of pairs of parallel and equal length segments, displaced from each other by an integer linear combination of the lattice vectors.. Please help me out.

## Programming PIC16f877a to control LED board from GSM Modem TC35i

If your command that you send as SMS is 10 characters wide then use a ring buffer (array) of say 12 or 15 elements. Every time there is a serial interrupt check if index is equal to buffer length. If yes, reset the buffer to 0. As the command in SMS will be the last part it will get stored in the buffer. To do this you have to read the message inde

## area of source, area of drain, etc. if we only have the spice model

These values only affect the ac & transient simulation results. You could measure the drain & source lengths (ld & ls) - usually they are equal. If so (ld=ls=l) : area as = ad = w*l (w=transistor(gate)-width ; l=drain-length resp. source-length, l is perpendicular to the gate) periphery ps = pd = w+2l (the width (...)

## biasing transistor for LNA

Hi, First, ft=gm/Cgs, and therefore Ls = 50/(6.28*279G) = 28.5 pH :) Second, seems like you got wrong value for Cgs, i measured Cgs for transistor in 65 nm technology with gm = 34m and it equal 270 fF. If value of Ls very small, one of possibilities is decreasing ft of transistor with additional capacitor or increasing channel length.

## ddr3 length matching

make sure that the stub length should be very minimum and match lengths chip wise . like maintain equal length from Controller to 1 st ddr3 as a group and 2nd set controller to 2nd DDR3 etc.. Do u have signal integrity tool?If yes then we can simulate how the stub is effecting signal from quality point of view.. And (...)

## planar antenna exponential profile

I want to realize a palanaire antenna which radiated exponential format, but I can not determine the right size: - Minimum width entered maximum-width output - The length of the line knowing that I work the 9 GHz frequency and use a dielectric substrate constente equal 4.9 and 1.45 mm thick I try with L = 10mm and 3mm = Wmin and Wmax = 20

## power equal to a remote control unit

Hello sir I designed a very simple circuit with a t.v. remote I.R. sensor device , A TRANSITOR , A CAPACITOR etc & its enough able to detect a remote control unit signal form a long distance of atleast 10 metres no matter which button i am pressing on the unit . . But only a remote control unit is able to make the circuit trigger not a

## Critique my design and routing equal length differential pairs with vias in Altium

Hi, so I have been working on a revised design of my first PCB based on the NXP LPC4337JBD144, the first rev is still not programming so while I have been debugging it I have done almost a complete redesign. Revisions I made from the first design: - Added bypass caps on all voltage inputs on ever device taking power from any of the power planes

## Quality factor of planar coil

How can I design high q spiral planar inductors? i know for helical inductors there is a parameter like length to diameter which should be almost equal to 1 for best quality factor but what about planar inductor? I know more turns means higher inductance and then high Q but are there are no definite formulas based on the geometry of the coil??

## i want to add fading to this code. how is it done please? Thanks very much

clear all; N = 10^6 ;% number of bits or symbols SNR_db = ; % multiple Eb/N0 values SNR= 10.^(SNR_db./10); %Transmitter d = rand(1,N)>0.5; % generating 0,1 with equal probability Signal = 2*d - 1; % BPSK modulation 0 -> -1; 1 -> 1 for i = 1:length(SNR_db) w = awgn(Signal,SNR_db(i),-3); %decision %errors(i)= zeros(errors);