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# Calculate Rms

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106 Threads found on edaboard.com: Calculate Rms

## Confusion about SMPS wire gauge

You apparently selected wire gauge for the primary winding based on peak current. That's completely wrong. rms current is the quantity defining the required gauge. It's also not appropriate to calculate wire gauge independent of the core size. You better use a transformer calculator tool, e.g. MDT from EPCOS/TDK, or the values from a trustworthy re

## 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.

## [Moved]: Noise in RMS and PSRR calculation in Cadence

Please can anyone one help me in calculating the noise in Vrms. I have got the noise in cadence in uV/sqrtHz now I want to convert the uV/sqrtHz in Vrms. I have the noise result attached. Do I have to use calculator if yes the how? I want to calculate PSRR in cadence of an OTA. Can any one help me step by step procedure to (...)

## How to calculate RMS phase error?

Hi, phase jitter: * take a number (n) of measured period times * calculate average of all (n) period times then calculate: 134299 this gives the jitter in time phase(rms) = t(rms) *360° / (t_avg) Klaus

## Has anybody done this ? (AC >DC >AC converter)

No problem. I can handle it. First I need to make a 230V to 12V buck converter to get 12V DC for IR21xx devices used in the constant voltage stabilizer. From 12V I will use 7805 to get 5V for PIC but the problem is how to get 12V because initially PIC will be off and to get 12V from buck converter PIC should be running and it needs 5V for that.

## How to calculate RMS Phase and Amplitude Errors for Digital Attenuator?

Hi, Anyone knows, how to calculate rms Phase and Amplitude Errors for 4-bit Digital Attenuator? If someone knows kindly help me in this. Thanks in advance. Moin

## Voltage/Current Meas. what am I doing wrong here?

Does your current probe measure peak value or rms, or trying to calculate that?

## RMS noise calculation for a bandgap circuit

Hi All, would anyone in this forum help me in a noise calculation problem? I post this in a different forum but did not get any answers. ------ I have the noise simulation results for a bandgap circuit. Am trying to calculate rms noise over 0.1Hz to 10Hz but not sure if my calculation is correct. Here is my results. The left figure and the righ

## RMS noise calculation for a bandgap circuit

Hi All, I have the noise simulation results for a bandgap circuit. Am trying to calculate rms noise over 0.1Hz to 10Hz but not sure if my calculation is correct. Here is my results. The left figure and the right figure were plotted from the same data. The only difference is that the Y-axis of the right figure is in log-domain. 13

## How do you estimate transformer peak output power knowing its nominal power

Hi all, How do you estimate or calculate the peak output power that a 500 W transformer in a push pull inverter can supply. 126649 Thanks

## RMS JITTER IN Phase locked loop

I am trying to calculate rms jitter for PLL. Will abs_jitter command in cadence calculator after selecting the clock suffice. The result, I get is absolute jitter. Is it the same as rms Jitter. please advise regards -pc

## [Moved] Output filter calculations in dc-dc flyback converter

make your 15v 200ma output be the regulated one. Then you calculate your capacitor ripple current from knowledge of the dc output current and the rms current in the output diode.....cap ripple current(rms) = sqrt(rms^2-DC^2). SEARCH "BRAD SUPPANZ rms CURRENT WAVEFORM CALCULATIONS" (sorry about caps)

## reading ac voltage in pic micro

Another option is to rectify the voltage after transformer. You could measure several samples per half-cycle, and calculate the rms value. I'm assuming that you don't want the peak value, but the true rms. Would not work: Drop voltage across diode would affect result.

## How to calculate active power from waveform.

I am simulating a reactive load in LTspice. I got a voltage and current waveform with some phase delay due to reactive nature of the circuit. I want to calculate the total power given to the load. I have attached a voltage and current waveform measured across load. 121403

## [Moved]: Current consumption in rms or average form

Hi, Sometimes you have to calculate with rms, sometimes you have to calculate with average. You know P = U * I. --> If U or I is considered to be as constant you have to use average. --> If U and I change in the same magnitude you have to use rms. (Twice the voltage gives twice the current) Example: * A 12V DC supp

## [Moved]: question about power in papers

please write the hspice code to calculate the power for the ISI articles

## how choose copper wire dimension for an inductor design

You should calculate the rms inductor current based on the waveform. Having the rms value, to get the copper area you can use the formula A = I / J, where A is the conductor's cross section area, I is the rms current and J is the current density. As a rule thumb, J should not exceed 4,5 A/mm?. As lower J goes, fewer are (...)

## Junction temperature and heatsink

Tj max will specify the max junction temp, the device can withstand ... you have to look into the graphs in DS to see what's the allowed rms current at this Tj. That means you may not be able run at max power what you need at this temp of junction. Also, with or without heat sink, you can calculate what can be the ambient temp for the device operat

## Divide and square root algorithms in Verilog

Apart from Babylonian method (cannot use this) what other algorithms exist that can be implemented in verilog. Requirement is to calculate rms of a series of 32bit signed numbers

## root mean square value

rms is for Alternating current. DC voltage is stable, but AC keeps alternating, so you need to calculate an average.

## Solving circuit problems with pulsating source

One way of doing that would be to calculate the rms. Another way, perhaps less time consuming would be to divide the energy dissipated by the time period. See the attachment below (Note that the definition of current in the attachment holds only for the first time period, but it is sufficient to calculate power from this, since current is a (...)

## how to calculate rms voltage of sine wave using 10 bit acd

i am using pic184520 ic it has 10bit adc. In my project i am measuring line voltage using step down transformer, the input of the transformer is 230v 50hz ac and output is 5v ac, my doubt is can i give the ac 5v directly to adc pin and ground are i must use any diode. my next doubt is how to calculate rms of sine wave i am using pic ccs compiler, p

## HFSS field calculator

BTW, don't use field calculator for this. It has crippled math giving awful errors. It is much better to separate field components in the field.calc and then calculate them along the track inside the report builder. math will be the same, but precision will be higher.

## sqt function required for rms calculation

i want to calculate rms values of some signals. xrms = sqrt{ 1/n*( x_1^2 + x_2^2 + ...... + x_n^2 ) }. but the problem is sqrt operation. i have used cordac but it does not gives precise values u can either give integers or fractions. I have also tried sqrt function from fixed_alg_ug pkg but its not synthesizable because it depends on (...)

## Power calculation for rectangular waveform in Cadence

Hi to all, I'm trying to built simple power amplifier with cmos output. I need to calculate output power in tran analysis, usually I do it with dft function and rms value for signal. For example for sinus we know: P=\frac{V^2 }{2R } Also, from wiki crest factor for rectangular

## calculation of rms and average voltage for a heating element(resistor)

hi, I want to calculate the rms and average voltage manually for the load heating resistor of 15ohm. I have given 11v supply, 18w power and current is applied by means of pwm. I should acheive 25%,50%,75% of heating. So how to calculate the rms and avg voltage for these requests.. Thanks and regards, Shalini

## Equiv. DC value of Square wave after Highpass filter

I think it average or rms value. A clear problem specification is the prerequisite for an exact answer. The average of an AC voltage is zero. You can simply refer to the definition of rms and calculate the square sum of fourier series after multiplying each component with the filter factor.

## What is the reference value of standard deviation of white Gaussian noise when doing

Hi! what is the standard deviation of white Gaussian noise when doing SINR simulation? I am new to communication simulation. I have a project which needs to calculate SINR. SINR = P/(N+I), and here the noise is white Gaussian noise. Generally speaking, is there any reference value of standard deviation of white Gaussian noise? Any comments or

## Modifying a 36VAC transformer for 18VDC

I want to modify the 36VAC transformer to give me 18VDC after has an rms voltage of roughly 12VDC. So how do I use this fact to calculate the number of secondary turns that I will need to re-wind in order to give m exactly 18VDC?

## Current Drain measurement, DC vs RMS (what to use to calculate current drain)

Hi I have the below measurements for device for my home project. 94354 As you can see, there is a significant difference in current drain between DC and rms. I have a 1000mAh battery in which I need to predict this current drain usage, but which do I use? Does the battery actually use DC or rms?

## ADC Input Value Round direction

Hi, The values that i calculate for the DAC are not integers,The DAC receive only integer values, Do i need to Round the calculate values to Up or down ? Thanks,

## How can I calculate dessipated power in transient analysis

Hi, the easiest way I suppose is using a spice "measure" to calculate the rms current of Idd. Google "spice rms current" and you should get what you want. Of course after getting the simulation result for the current, you need to multiply it with the value of the power supply to get the average power dissipation. Hope this help, (...)

## rms value calculation in simulink of r2009b

Hi friends, I am trying to calculate the rms value of a current parameter in matlab(R2009b) simulink environment. Can anyone pls help me to find the blocks which can be used for the same. waiting for your reply. Thanks in advance. SUMANTA

## Need Help: Power percentage calculation in phase firing angle

Let say we have firing delay for 5 ms after zero crossing point as shown by the picture below. (220V 50Hz) 86636 That means the firing angle is 90 degree right? My problem now is, by knowing the firing delay (5 ms) and the firing angle (90) how do I calculate the percentage of power that is delivered to the load? Is th

## EM VIA volations:Average current density to calculate no.of vias.Why not RMS current?

Hi all, During EM checks we determine how many vias are required based on average current density divided the current limit per via. Why are we using average current density to find the number if vias to pass EM? Why dont we use rms current to calculate the number of vias required? Dont we expect joule heating in vias? Please clarify

I interface ADE7878 with PIC.(SPI interface). I am able to interface properly and I am get the reading from following register of ADE7878 rms voltage & current instantaneous voltage & current reactive power apperant power active power how should I calculate the POWER POWER FACTOR LOAD SHIFT and how to scale all the above register. My

## Method to Calculate True RMS Power, Will it work??

Hi, I am probably missing something obvious but i am looking to design a circuit to calculate true rms power for an AC mains supply, Would i be correct in saying the following would work, 1) Measure true rms voltage for one complete cycle using resistor divider 2) Measure true rms current for next cycle using (...)

## What's the best method to calculate the wattage of a resistor & cap in any circuit ?

What's the best method to calculate the wattage of a resistor & cap in any circuit ?

## pll phase-noise/ rms phase error

In a Phase-modulation scheme,rms phase error is very critical,it should be less than 2deg in most cases. This rms phase error directly relates to in-loop phase noise of pll output. while working with PLL frequency synthesizer, we come across two formulae to calculate phase noise: 1) in-loop PLL_PhaseNoise = Noise floor+ 1

## How to calculate EVM and MER if the noise in the signal has an RMS value of 0.4

I cant seem to find any information on how to do this problem, For a 16 QAM mod signal how do i calculate EVM and MER if the noise in the signal has an rms value of 0.4 and the phasor amplitude is 8v?

## reconstruction of voltage signal

Hey, I'm searching for a way to reconstruct the line voltage with measured zero crossing points and rms of every half cycle. I need this to calculate the phaseshift between the current and the voltage signal. The current signal isn't an ideal sinus wave. The line frequency is about 50 hz. I tried to handle this with the assumption that the volta

## AC mains measurement with loc110

I want to measure voltage (and calculate rms value of it) using loc110. I'm referencing to this difference is i will measure a single phase 230V AC. I want to ask a few questions who have knowledge about this: 1- Do i need to rectify AC input? 2- What happ

## Arbitrary Waveform Generator's Power

First convert voltage from peak-peak to rms, then calculate power. Impedance is usually 50 ohm for RF. Vrms = Vpp/(2*sqrt(2)) Power = Vrms^2/impedance

## How to get the total energy of two waveforms buried in a noise

calculate the rms (Root Mean Square) it is the same as the standard deviation (1/n*Sum(value-average)^2

## Calculation of wire size in flyback transformers

Hi everybody, .....calculate the cross-section area of the bare copper cable using either the rms current or the average current. wires are selected on the basis of rms current. selection based on average current is not known. can you refer the actual literature where it is specified?

## Measuring AC voltage from electric cables

Use a mains to 3 V step down transformer to reduce the supply voltage and give galvanic issolation between the mains and you measuring circuit. Use amicroprocessor to sample the output of the transformer at a sampling rate of at least 10 the supply line frequency. calculate the rms value in the microprocessor

## how to calculate the dc output voltage after a diode rectifier?

69353 as shown in ther graph, the input ac voltage is 60V rms, and with 40V dc offset according to Vdc=Vpeak/pi how do we calculate the output voltage? maybe its rms value in this case.

## how to calculate rms value of log mag values

i know excel but these values in log magnitude values

## calculation of root mean square error

how to calculate the rms error of log mag values

## calculating the efficiency of an Inverter

Hi guys, I have a doubt regarding the efficiency calculations for an inverter (DC-AC). I know that to calculate efficiency i have to divide power-out/power-in and power is i^2*R, V^2/R, etc, but there is something troubling me about the calculations when there is an rms value. How do I calculate the efficiency of a FullBridge inverter (...)