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

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 11:03 :: shanmei :: Replies: **5** :: Views: **261**

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

Analog Circuit Design :: 07-25-2015 03:46 :: admiral_v :: Replies: **2** :: Views: **210**

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 10:47 :: ysba :: Replies: **3** :: Views: **229**

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 04:52 :: ravindragudi :: Replies: **12** :: Views: **616**

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) :: 03-10-2015 23:45 :: keyboardcowboy :: Replies: **0** :: Views: **358**

Elementary Electronic Questions :: 02-23-2015 07:23 :: Nasser750gx :: Replies: **6** :: Views: **308**

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 13:08 :: mrinalmani :: Replies: **4** :: Views: **554**

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 11:48 :: raman00084 :: Replies: **2** :: Views: **835**

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 07:09 :: Andryuha :: Replies: **2** :: Views: **573**

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 02:12 :: habbas33 :: Replies: **5** :: Views: **360**

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 05:20 :: sarge :: Replies: **0** :: Views: **302**

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 05:41 :: FvM :: Replies: **8** :: Views: **531**

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 17:35 :: FvM :: Replies: **4** :: Views: **356**

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 :: 10-29-2013 22:12 :: kerin :: Replies: **4** :: Views: **409**

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 07:09 :: boylesg :: Replies: **2** :: Views: **408**

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 09:46 :: faisal78 :: Replies: **4** :: Views: **456**

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 05:15 :: TXRX :: Replies: **2** :: Views: **256**

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 11:11 :: George_P :: Replies: **2** :: Views: **357**

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 06:52 :: shom_show :: Replies: **2** :: Views: **2028**

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

Power Electronics :: 02-05-2013 15:26 :: Don_dody :: Replies: **3** :: Views: **494**

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 12:21 :: muthu21888 :: Replies: **1** :: Views: **675**

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 13:35 :: amitdpg :: Replies: **2** :: Views: **681**

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 (...)

Analog Circuit Design :: 11-13-2012 16:53 :: ste2006 :: Replies: **21** :: Views: **1748**

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

Elementary Electronic Questions :: 10-13-2012 19:24 :: dineshdeshmuk :: Replies: **10** :: Views: **557**

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 12:07 :: afz23 :: Replies: **0** :: Views: **568**

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 11:15 :: davuel :: Replies: **3** :: Views: **895**

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 15:44 :: phoo :: Replies: **1** :: Views: **453**

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 04:55 :: seyyah :: Replies: **1** :: Views: **1177**

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 10:23 :: pstuckey :: Replies: **3** :: Views: **367**

Digital Signal Processing :: 03-20-2012 17:32 :: klystron :: Replies: **2** :: Views: **486**

Hi everybody,
I am looking for a justified answer about the calculation of wire size.
I am completely confused because in literature I have found formulas that **calculate** the cross-section area of the bare copper cable using either the **rms** current or the average current.
In my case where I want to compute the wire size in a flyback tr

Power Electronics :: 03-20-2012 11:04 :: strape81 :: Replies: **2** :: Views: **1171**

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 06:36 :: klystron :: Replies: **5** :: Views: **703**

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.

Analog Circuit Design :: 02-18-2012 15:04 :: W_Heisenberg :: Replies: **5** :: Views: **9132**

i know excel but these values in log magnitude values

RF, Microwave, Antennas and Optics :: 02-18-2012 10:18 :: veerababuj :: Replies: **2** :: Views: **604**

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

RF, Microwave, Antennas and Optics :: 02-15-2012 10:07 :: veerababuj :: Replies: **1** :: Views: **2376**

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 10:23 :: yokahu :: Replies: **3** :: Views: **5842**

Hi guys,
Does anybody know how to **calculate** FSK error? I mean modulation accuracy of GFSK signal. The profile of GFSK I generated is
modulation index = 0.5;
data rate = 500kHz;
frequency deviation = 125kHz;
I have measured the signal with Agilent VSA. The FSK err is about 2.8% **rms**. But I want to know the calculation process behind this

RF, Microwave, Antennas and Optics :: 11-17-2011 04:28 :: jochen :: Replies: **0** :: Views: **991**

I have an urgent query please do help me...I am only a beginner in MATLAB...I have a signal that has fs=1000. Its an ECG signal and has 80 leads. I have to **calculate** the **rms** of it. When I used the code stated above MATLAB says that Subscript indices must either be real positive integers or logicals..Eagerly waiting for any reply. The factors presen

Digital Signal Processing :: 08-19-2011 06:30 :: alvinsam :: Replies: **0** :: Views: **848**

Dear All,
Could you tell me how to **calculate** the metal width for a connection which has a very large peak current during dynamic but a low dc current during static? Since the document from foundry just provides current limits for dc or **rms**.
Do you have any equation or paper about this subject?
Thanks in advance!

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 06-02-2011 10:46 :: ken_cn :: Replies: **6** :: Views: **1188**

Please be more precise, I already read your post but I can't see if it is a transformless non regulated source . Please put a diagram of it.
As you saw in fact there are several ways to do what are you trying. And severals ways to **calculate** it, some depends of the devices that your are using.

Elementary Electronic Questions :: 05-17-2011 11:59 :: Miguel Gaspar :: Replies: **27** :: Views: **2302**

Be aware that measuring the peak value you´re not able to **calculate** the "real" **rms** value beacuse is needed to measure and integrate point-to-point of the wave.
+++

Microcontrollers :: 04-16-2011 15:55 :: andre_teprom :: Replies: **1** :: Views: **567**

You need to design the high voltage interface for the ADC0808. It is recommended that you galvanically isolate the A2D and micro processor from the high input voltage.
You require the following functions:
Read the A2D
Covert the A2D measurements to real-world parameters
**calculate** the **rms** value
Perform the voltage window check
Control the output

Microcontrollers :: 04-01-2011 13:18 :: klystron :: Replies: **3** :: Views: **1301**

you can design it....but a dmm is way more costly if you are going to use microcntroller.
DC voltage= use ADC(analog to digital voltage= use peak detector and then using microcontroller **calculate** the **rms** value .(Imax/ root(2)).
---------- Post added at 21:03 ---------- Previous post was at 21:00 ----------[/

Analog Circuit Design :: 01-30-2011 10:33 :: Abhishek K :: Replies: **5** :: Views: **2748**

You need to finalize operating condition of the inductor (Continuous mode or Discontinuous mode) before you **calculate** your inductor, The mode of operation will decide the stress on the Capacitor ripple current, Inductor peak current, Switching device **rms** current etc, refer National semi web site for more details on calculations(they have standard c

Power Electronics :: 09-27-2010 02:24 :: rvionics :: Replies: **3** :: Views: **1890**

Hi. I am currently using PIC 18F4520 to perform ADC. I want to read an analog signal **calculate** the **rms** and store the value to perform power calculations. I am having a problem with number of samples.When i print the values of the ADC using UART the are not what I expected. I am using a 20 MHz crystal. Please someone look at the code and tell me wha

Microcontrollers :: 09-01-2010 18:58 :: Optimus_prime :: Replies: **0** :: Views: **1245**

as the picture,the current wave CCM and DCM,how to **calculate** the avg,**rms** ?
(mosfet and diode's avg,**rms**)
thanks !

Power Electronics :: 07-19-2010 10:08 :: wei9321 :: Replies: **0** :: Views: **1056**

"The effective noise bandwidth (ENB) is a property for a filter circuit and not for an opamp alone."
Then, how can I **calculate** the ENB of op-amp?
how can I simulate the input referred **rms** noise of op-amp in h-spice?

Analog Circuit Design :: 07-15-2010 07:11 :: fsunken :: Replies: **0** :: Views: **1158**

I have an offline flyback with a 30V secondary voltage and an 8W LED Driver connected to this secondary.
The only capacitor on the secondary rail is a 150uF electrolytic capacitor
To **calculate** the AC **rms** ripple current in the flyback’s secondary electrolytic capacitor…………….
Do I have to…

Power Electronics :: 06-21-2010 11:23 :: eem2am :: Replies: **0** :: Views: **2502**

I want to **calculate** **rms** from isf function in ads how i can this work.

Analog Circuit Design :: 06-15-2010 08:43 :: sadegh.raisi63 :: Replies: **0** :: Views: **659**

I am making a single phase inverter with pwm frequency of 7.8khz from a 24 volt battery and variable modulation index which is then step up using a 24/225 v transformer. the output of the transformer is fairly sinusoidal (filtered by leakage inductance) while that of the H-bridge is square wave pwm type(low voltage side).
how do i measure the

RF, Microwave, Antennas and Optics :: 06-02-2010 18:19 :: isfandhassan :: Replies: **0** :: Views: **2297**

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