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105 Threads found on edaboard.com: **Rms Noise**

most spectrum analyzers simply measure the power spectral density of the phase **noise**, and integrated it to show **rms** jitter. On the average, it is an accurate calculation.

RF, Microwave, Antennas and Optics :: 03-01-2017 10:21 :: biff44 :: Replies: **3** :: Views: **433**

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 (...)

Analog Circuit Design :: 01-11-2017 06:24 :: simplsoft :: Replies: **0** :: Views: **642**

As for a free-run oscillator, the jitter accumulates over time. The wavescope calculates jitter in a certain time windows. My question is if I want to know the **rms** jitter of a oscillator in a time range of ,maybe 4us , then what the is the frequency range for the integral of phase **noise** in reponse. （mainly, the lower limit of integral）

Analog Circuit Design :: 01-08-2017 08:50 :: Kristya :: Replies: **0** :: Views: **469**

Hi,
I am trying to measure AC **rms** voltage using PIC microcontroller. I have attached the circuit for measurement. I am connecting a 3V step down transformer out to the input of the circuit.The feedback capacitor has been added to reduce the **noise**, but I am getting **noise** if I add this. This is getting smooth after the low pass filtering. (...)

Microcontrollers :: 11-24-2016 13:34 :: archusvijay1 :: Replies: **6** :: Views: **618**

I can understand **rms** is like the average, not the instaneous value.
but why sqaure it? why not just plain **rms**. or to 3rd, 4th power.
why square?

Analog Circuit Design :: 09-10-2016 23:34 :: sys_eng :: Replies: **4** :: Views: **661**

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 (...)

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: **405**

The power darlington transistors need heatsinks. If the output voltage swing is as high as 8V **rms** then the output power is 8W into 8 ohms and each darlington heats with almost 2W.
The 741 opamp was designed 48 years ago! It is noisy and its slew rate cuts its high level frequencies above only 9kHz. A modern low **noise** audio opamp works perfectly to

Analog Circuit Design :: 05-31-2016 13:11 :: Audioguru :: Replies: **2** :: Views: **337**

Hi Saad,
Say you have the **noise** voltage expressed as εn .
Then the (normalized) power spectral density is εn2 [V2.
The normalized power in a bandwidth B is εn2B [V2
The **rms** voltage is VEF=sqrt(εn2[/SUP

RF, Microwave, Antennas and Optics :: 05-23-2016 21:48 :: zorro :: Replies: **4** :: Views: **527**

First try to define ( by commercial comparison) your expectations in a value for;
-equivalent input **noise** and signal range
-THD
-Output peak power
-**rms** power, and temperature rise from losses.
-Load impedance range vs power
and frequency response deviations
If you can afford to avoid poor choices of ceramic by replacing the double bar non polar

Hobby Circuits and Small Projects Problems :: 05-04-2016 18:33 :: SunnySkyguy :: Replies: **13** :: Views: **845**

hi,
P**rms** = Vds x Ids
P**rms** = **rms** RF output power.

RF, Microwave, Antennas and Optics :: 04-14-2016 16:25 :: pragash :: Replies: **1** :: Views: **353**

See equation for **rms** Period Jitter in attached figure.
How to derive this equation ?
Especially, how is sin() term from ?

RF, Microwave, Antennas and Optics :: 03-11-2016 13:46 :: pancho_hideboo :: Replies: **1** :: Views: **625**

You are looking to design a Window Comparator which requires two Comparators with wired OR output low for detecting UV or OV.
This requires low ripple or **noise** inputs, hysteresis, supply filtering and a good low **noise** reference voltage for comparing the scaled inputs.
Define your spec first using **rms** converted to peak.
UV detect le

Power Electronics :: 12-17-2015 05:55 :: SunnySkyguy :: Replies: **21** :: Views: **1637**

Hi.
Can somebody please explain (maybe in a little layman's te**rms** ;-)) the physical significance of WHY the ADC quantization **noise** spectrum lies from -fs/2 to + fs2 (fs being the sampling freq)? is it like the max. possible freq of such **noise** always

Analog Circuit Design :: 07-17-2014 15:38 :: jdp721 :: Replies: **6** :: Views: **1442**

gangs,
I am running .**noise** analysis in cadence's spectre. Two methods display the simulation results: method 1. plot equivalent input **noise**. This can be done by: locate spectre simulator menu-->results-->direct plot-->equivalent input **noise**. A figure will pop out. Then go to calculator's **rms** function. The final result is (...)

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 12-08-2014 02:07 :: hyleeinhit :: Replies: **1** :: Views: **1390**

Hi,
I have designed a front-end readout circuit which consist of a preamplifier and pulse shaper in Mentor Graphics. Now I want a **noise** simulation, from transient **noise** simulation I got the circuit output **rms** **noise** voltage, but how do I know each individual transistor **noise** contribution?
I don't know (...)

Analog Circuit Design :: 08-13-2014 13:46 :: Nurahmad :: Replies: **0** :: Views: **605**

how to build a circuit to measure **rms** value of the sine wave signal with frequencies vaying from 1 Hz to 1 KHz.
the voltages is of range +/-20 mv(if it is unamplified), +/- 10 V if it is amplified.
Thanks in advance.

Analog Circuit Design :: 07-01-2014 16:30 :: nm2007k :: Replies: **11** :: Views: **1256**

Peak ripple would of course be (Max-min)/2 which is closer to **rms** **noise**, but depends on if your interest is thermal **noise**, clock feedthru or some other **noise** in the signal. Normally if it is fundamental f or 2f , we call it ripple, otherwise just "**noise** p-p" covers all types including transient (...)

Analog Circuit Design :: 05-14-2014 00:32 :: SunnySkyguy :: Replies: **5** :: Views: **1086**

. It depends on your sampling rate. ADC is linear but your detector is not.
Do you want to only track changes in Vac over long term or short term interruptions or do statistics Avearage & deviations ?
Choices:
quasi **rms** with Peak, P-p or rectified average
I would use LPF **noise** filter and rectified average with another LPF.
200Hz LPF before br

Elementary Electronic Questions :: 05-12-2014 03:37 :: SunnySkyguy :: Replies: **3** :: Views: **843**

Standard Deviation=**rms** Value of **noise**

Digital communication :: 10-30-2013 02:42 :: pancho_hideboo :: Replies: **4** :: Views: **602**

I have read that using averaging reduces the **noise** during ADC reading. Using more number of samples for averaging further reduces the **noise**.
Can someone please let me know the mathematical relationship between **rms** **noise** and no. of samples used for averaging for an ADC?
I have a data aquisition system in which during EMC (...)

Professional Hardware and Electronics Design :: 03-07-2013 09:31 :: knikhil271083 :: Replies: **1** :: Views: **639**

That sounds about right. I would have to look up the maths (I cannot do so at the moment) unless someone else can do so, but as a rule of thumb a peak to peak **noise** will roughly correspond to an **rms** value of one fifth. You do need to consider the bandwidth you are observing over in each case though, to make sure you are comparing like with like. Th

RF, Microwave, Antennas and Optics :: 01-20-2013 18:39 :: keith1200rs :: Replies: **1** :: Views: **422**

The power dissipated in a resistor ir Vr^2/R, where Vr ir the **rms** voltage value on the resistor and R is its resistance.
If you have a voltage source of **rms** voltage Vs and internal resistance Rs, then the available power (i.e. the maximum power you can get from it) is obtained when the load is matched to the source, i.e. when R=Rs. In this conditio

Analog Circuit Design :: 01-18-2013 18:41 :: zorro :: Replies: **3** :: Views: **452**

Yup - I second Brad's comments about operating frequency and measurements. You may have more luck with a so called "true **rms**" meter, or better yet - an oscilloscope.
Audible **noise** from SMPS inductors/transformers operating in the frequency range of human hearing is generally unavoidable due to magnetostriction (

Power Electronics :: 10-17-2012 00:39 :: thylacine1975 :: Replies: **8** :: Views: **1151**

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 (...)

RF, Microwave, Antennas and Optics :: 09-26-2012 00:38 :: afz23 :: Replies: **1** :: Views: **1011**

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 (...)

Analog Circuit Design :: 09-25-2012 16:07 :: afz23 :: Replies: **0** :: Views: **910**

Just quoting model numbers without even a manufacturers name is of no use to most members of this forum. What you need is a CW signal source with a calibrated attenuator, a receiver with an IF output and a **rms** power meter that is accurate at IF and an input termination resistor. So what have you not got?
Frank

RF, Microwave, Antennas and Optics :: 09-07-2012 18:07 :: chuckey :: Replies: **2** :: Views: **851**

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: **1595**

CROs produce less then 1mm p-p **noise** at their most sensitive setting. i.e. a little thickening of the base line.
P.S. you can not measure **noise** with a CRO, you need a **rms** sensing device.
Frank

Analog Circuit Design :: 06-22-2012 17:26 :: chuckey :: Replies: **2** :: Views: **595**

hello!
Does anyone know how to get the **rms** output **noise** and input dynamic range
of a transimpedance amplifier using cadence or synopsys?
Please help me. I don't have any idea on how to get it..

Analog Circuit Design :: 03-21-2012 15:24 :: aprilyne :: Replies: **0** :: Views: **845**

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

Digital Signal Processing :: 03-20-2012 21:32 :: klystron :: Replies: **2** :: Views: **641**

When I simulated the phase **noise** of a ring oscillator based VCO using Spectre p**noise** analysis, I found the **rms** accumulated jitter increasing with increasing the maximum number of sidebands. And the dominant **noise** contributor was the induced gate **noise** of some swtiched off units (Vds = 0) in the V2I. I am not (...)

Analog Circuit Design :: 01-22-2012 12:58 :: murali83.july :: Replies: **0** :: Views: **622**

What you expect is right to some extent of frequency. your freq of 12G is very high may be there is gain peaking at some point . It would be better to see integrated **rms** **noise** plot vs frequency it will provide better insight. Without actual circuit or ac gain plot it difficult to pinpoint.

Analog Circuit Design :: 12-10-2011 10:33 :: eld03 :: Replies: **2** :: Views: **775**

If the input signal aren't guaranteed to have a clean sine waveform (they hardly will), a true **rms** measurement is required. It can be only performed by summing the squares.
For the **rms** measurement, filtering of the input signals doesn't make much lsense, unless you have high frequency **noise** that you want to contribute to the measurement. (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 06-24-2011 12:08 :: FvM :: Replies: **8** :: Views: **4577**

Hello
See this topic The Designer's Guide Community Forum - **rms** **noise** value calculation

RF, Microwave, Antennas and Optics :: 06-01-2011 07:38 :: pavel_adameyko :: Replies: **2** :: Views: **5239**

hi all,
if the input **rms** **noise** of an amplifier is AV**rms**, the bandwidth is BHz, and the input-referred **noise** is CV/rtHz. Assuming the **noise** is flat.
1. What's the relation between A and C? does C equal A/rtB?
2. How to convert A (or C) to decibal? is NF=10log(1+C/4kTRs) or NF=10log(1+C/kTRs)? which one is (...)

Analog Circuit Design :: 04-19-2011 02:44 :: x1346 :: Replies: **1** :: Views: **1189**

Hi all,
I have several questions which i will describe by topics. All the circuit design is made in Candence using Spectre.
1 - As transient **noise** introduces **noise** in the transient simulation, I export the data to Matlab to perform the Jitter (**rms** and Peak-to-Peak) calculations. How can I do this in Cadence ?
2 - How can be compared (...)

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 04-06-2011 07:26 :: netbug :: Replies: **0** :: Views: **3043**

In a CW carrier, the time jitter is figured out by integrating the phase **noise**, thereby converting it to pk-pk or **rms** time jitter.
If one is deliberately FM modulating a carrier, then that FM modulation will easily dominate over the phase **noise** effect. So all you have to do is analyze the fm modualtion and you will have the answer. You (...)

RF, Microwave, Antennas and Optics :: 03-17-2011 15:33 :: biff44 :: Replies: **3** :: Views: **713**

In general it will depend on the application but good tests include:
- minimum load for stability
- phase margin
- gain and GBW
- slew rate OR settling time to a specific level and accuracy
- input common range
- PSRR
- **rms** **noise**
Let us know if you need specific ideas

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-11-2011 16:07 :: dgnani :: Replies: **3** :: Views: **984**

I couldn't figure this out as well, but my work around was passing my clock throw a comparator build with mos, then including **noise** only in the comparator. I then measured the **rms** jitter coming out of the comparator then increased the **noise** scale factor till I had a **rms** jitter of 20pS which i needed for my sigma delta (...)

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 12-22-2010 09:37 :: jgk2004 :: Replies: **1** :: Views: **1422**

Low **noise** is an important spec for some applications. 30uV **rms** **noise** is required somewhere.

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 12-21-2010 06:32 :: leo_o2 :: Replies: **7** :: Views: **1468**

Analog Circuit Design :: 10-21-2010 16:51 :: vfone :: Replies: **4** :: Views: **1260**

Hi AdvaRes,
there isn't short answer for that.
you will need to know the power supply parameters like:
**rms** **noise**, ptp **noise**, switched or LDO, is switched at what frequency and what is the output capacitor and Inductor.
if it's LDO then it is more simple, for example if you will use LDO of Linear LT1764 then you should had Sin of (...)

RF, Microwave, Antennas and Optics :: 07-17-2010 09:20 :: rancohen_2000 :: Replies: **3** :: Views: **1171**

"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 11:11 :: fsunken :: Replies: **0** :: Views: **1408**

Hello all,
I have some questions about **noise** measurement on op amp...
consider that I'm in the broadband zone, so a white **noise** only is present, I measure the max voltage value on the scope. How can I deduce the **rms** value ? then if I could have the **rms** value, I can deduce the **noise** of my stage by multiply (...)

Analog Circuit Design :: 07-05-2010 14:12 :: glias :: Replies: **1** :: Views: **740**

PLL Phase Error **rms** = 107 x √ Loop_Bw x 10^(Phase_**noise** / 20)

RF, Microwave, Antennas and Optics :: 07-04-2010 19:47 :: vfone :: Replies: **11** :: Views: **2496**

Hello everyone,
Do you have any idea in **noise** definition and measurement for CMOS image sensor?
As far as I know, to find the **rms** **noise** of the image sensor, we will get the N sample values of output signal of a pixel at, then calculate the standard derivation of these samples => **rms** **noise**.
Am I right? (...)

Analog Circuit Design :: 04-22-2010 07:47 :: rficdesigner :: Replies: **4** :: Views: **1861**

Hi,
Hope someone can help me with the definition of signal-to-**noise** ratio (SNR).
On the last page of this document:
it is said that SNR is the ratio of the peak-to-peak signal and the **rms** **noise**
However, wikipedia:
says that it is the rat

Digital communication :: 02-24-2010 14:04 :: raebrm :: Replies: **2** :: Views: **5150**

Hello,
We would like to measure the **rms** output **noise** voltage, SNR and Minimum detectable signal (MDS) of a transimpedance amplifier (TIA).
Do you know the methods, instruments, and measurement setup, please help me.
Thanks you and have nice day.

Analog Circuit Design :: 02-25-2010 07:18 :: rficdesigner :: Replies: **0** :: Views: **2108**

Factors that will influence the **rms** (narrow or braod band) are:
Temperture
Other process related **noise**
The way you take the FFT. (FFT bin size)
Sinc the capturing of the time domain wave form to start at the same shaft angle
Please see tha attached graphs at login with username demo and password demo. Download compone

Elementary Electronic Questions :: 01-30-2010 09:57 :: klystron :: Replies: **4** :: Views: **2511**

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