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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

waveform equations on pg 4 and 5 of the attached show how you can calculate ac rms current for capacitor for forward converter - - - Updated - - - But here also is the website showing a nice calculator - - - Updated - -

## [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)

Before ordering components you should calculate some parameters of the AC/DC part. - Input rms current - VDC voltage ripple - Capacitor ripple current (check against datasheet rating) The input and capacitor current will depend on power grid impedance but is usually quite high in relation to output current. The present rectifier circuit isn

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

You are asking about a commercial attenuator IC, custom analog chip design or a discrete attenuator circuit? In case of the commercial product, you'll derive it from datasheet specifications or need to measure it, in all other cases, you can calculate the errors if you know all circuit parameters, including parasitic elements.

## 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 supply, a (...)

## [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.