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106 Threads found on edaboard.com: **Calculate Rms**

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

Power Electronics :: 03-01-2017 11:35 :: FvM :: Replies: **5** :: Views: **762**

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.

Power Electronics :: 02-08-2017 09:36 :: sac1991 :: Replies: **3** :: Views: **506**

Please can anyone one help me in calculating the noise in V**rms**. I have got the noise in cadence in uV/sqrtHz now I want to convert the uV/sqrtHz in V**rms**. 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 (...)

Analog Circuit Design :: 01-11-2017 06:24 :: simplsoft :: Replies: **0** :: Views: **585**

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

RF, Microwave, Antennas and Optics :: 12-08-2016 10:48 :: KlausST :: Replies: **1** :: Views: **627**

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

Microcontrollers :: 12-01-2016 16:22 :: FvM :: Replies: **55** :: Views: **3913**

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.

RF, Microwave, Antennas and Optics :: 11-10-2016 10:08 :: FvM :: Replies: **3** :: Views: **378**

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

Analog Circuit Design :: 10-09-2016 14:26 :: Gorgon :: Replies: **8** :: Views: **962**

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

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 07-21-2016 02:02 :: bhl3302 :: Replies: **0** :: Views: **56**

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

Analog Circuit Design :: 07-13-2016 16:32 :: bhl3302 :: Replies: **0** :: Views: **383**

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

Power Electronics :: 03-02-2016 22:53 :: Lion :: Replies: **6** :: Views: **577**

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

RF, Microwave, Antennas and Optics :: 02-16-2016 11:48 :: pankajpc :: Replies: **1** :: Views: **581**

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)

Power Electronics :: 12-11-2015 22:23 :: treez :: Replies: **1** :: Views: **545**

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.

Microcontrollers :: 10-15-2015 16:31 :: andre_teprom :: Replies: **4** :: Views: **821**

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

Elementary Electronic Questions :: 09-16-2015 22:27 :: chandresha1 :: Replies: **7** :: Views: **757**

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

Analog Circuit Design :: 08-06-2015 15:03 :: shanmei :: Replies: **5** :: Views: **764**

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

Analog Circuit Design :: 07-25-2015 07:46 :: admiral_v :: Replies: **2** :: Views: **542**

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 (...)

Power Electronics :: 06-12-2015 14:47 :: ysba :: Replies: **3** :: Views: **641**

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

Power Electronics :: 03-26-2015 08:52 :: ravindragudi :: Replies: **12** :: Views: **953**

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

ASIC Design Methodologies and Tools (Digital) :: 03-11-2015 03:45 :: keyboardcowboy :: Replies: **0** :: Views: **782**

Elementary Electronic Questions :: 02-23-2015 12:23 :: Nasser750gx :: Replies: **6** :: Views: **588**

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 (...)

Education :: 06-24-2014 17:08 :: mrinalmani :: Replies: **4** :: Views: **877**

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

PC Programming and Interfacing :: 06-10-2014 15:48 :: raman00084 :: Replies: **2** :: Views: **1396**

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.

Electromagnetic Design and Simulation :: 04-21-2014 11:09 :: Andryuha :: Replies: **2** :: Views: **1217**

i want to **calculate** **rms** values of some signals.
x**rms** = 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 (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 02-25-2014 07:12 :: habbas33 :: Replies: **5** :: Views: **663**

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

RF, Microwave, Antennas and Optics :: 02-13-2014 10:20 :: sarge :: Replies: **0** :: Views: **444**

But smijesh said we need to **calculate** **rms** voltage for pulsating dc.
I don't know if you need to **calculate** it, but you did it right. I ignore the unrelated,meaningless or erroneous columns like "maximum power" and "activation time".

Elementary Electronic Questions :: 02-04-2014 10:41 :: FvM :: Replies: **8** :: Views: **1255**

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.

Elementary Electronic Questions :: 01-19-2014 22:35 :: FvM :: Replies: **4** :: Views: **679**

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

Digital communication :: 10-30-2013 02:12 :: kerin :: Replies: **4** :: Views: **591**

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?

Power Electronics :: 10-29-2013 11:09 :: boylesg :: Replies: **2** :: Views: **619**

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**?

Power Electronics :: 08-02-2013 13:46 :: faisal78 :: Replies: **4** :: Views: **732**

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,

Microcontrollers :: 07-29-2013 09:15 :: TXRX :: Replies: **2** :: Views: **436**

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, (...)

Power Electronics :: 07-23-2013 15:11 :: George_P :: Replies: **2** :: Views: **591**

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

Digital Signal Processing :: 06-19-2013 10:52 :: shom_show :: Replies: **2** :: Views: **4263**

Assuming a resistive load, you just need to **calculate** the **rms** value of the phase chopped waveform. It should be equal to V**rms**_load=V**rms**_source*√, where θ is the phase conduction angle ranging from 0 to π. For a non-resistive load, the expression is much more complicated.

Power Electronics :: 02-05-2013 23:22 :: mtwieg :: Replies: **3** :: Views: **716**

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

ASIC Design Methodologies and Tools (Digital) :: 12-04-2012 17:21 :: muthu21888 :: Replies: **1** :: Views: **1028**

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

Power Electronics :: 12-03-2012 18:35 :: amitdpg :: Replies: **2** :: Views: **1089**

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 Current Tran

Analog Circuit Design :: 11-14-2012 06:50 :: crutschow :: Replies: **21** :: Views: **2781**

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

Elementary Electronic Questions :: 10-13-2012 23:24 :: dineshdeshmuk :: Replies: **10** :: Views: **850**

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

Analog Circuit Design :: 09-25-2012 16:07 :: afz23 :: Replies: **0** :: Views: **877**

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?

RF, Microwave, Antennas and Optics :: 08-28-2012 15:15 :: davuel :: Replies: **3** :: Views: **1529**

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

Digital Signal Processing :: 05-18-2012 19:44 :: phoo :: Replies: **1** :: Views: **619**

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

Hobby Circuits and Small Projects Problems :: 05-05-2012 08:55 :: seyyah :: Replies: **1** :: Views: **1500**

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

RF, Microwave, Antennas and Optics :: 04-23-2012 14:23 :: pstuckey :: Replies: **3** :: Views: **518**

Digital Signal Processing :: 03-20-2012 21:32 :: klystron :: Replies: **2** :: Views: **629**

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?

Power Electronics :: 03-20-2012 16:19 :: srizbf :: Replies: **2** :: Views: **2018**

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

Analog Circuit Design :: 02-22-2012 11:36 :: klystron :: Replies: **5** :: Views: **874**

as shown in ther graph, the input ac voltage is 60V **rms**, and with 40V dc offset
Despite of the unclear words, I assume that you mean a sine waveform with superimposed DC (offset), as shown in post #4 (with different DC offset).
Vin = 40 + 84.85 sin(ωt)
The circuit involves a nonlinear operation, thus the sine average isn

Analog Circuit Design :: 02-19-2012 19:56 :: FvM :: Replies: **5** :: Views: **15083**

i know excel but these values in log magnitude values

RF, Microwave, Antennas and Optics :: 02-18-2012 15:18 :: veerababuj :: Replies: **2** :: Views: **790**

how to **calculate** the **rms** error of log mag values

RF, Microwave, Antennas and Optics :: 02-15-2012 15:07 :: veerababuj :: Replies: **1** :: Views: **2787**

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 (...)

Power Electronics :: 01-12-2012 15:23 :: yokahu :: Replies: **3** :: Views: **12017**

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