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# Rms Input Noise

25 Threads found on edaboard.com: Rms Input Noise

## Noise in AC voltage measurement

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 (...)

## why noise often measure in Square(RMS)

The definition of "plain" rms is the square-root of the sum of the squares. That gives the equivalent power value of the waveform (normally used in signal analysis), which is why the square is used (since power is proportional to the square of the voltage). It's not the average value. Does that answer your question?

## Testing out an amplifier chip

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 (...)

## cadence noise simulation results are different by two result display methods

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 measurement of frequency varying sine signal

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.

## Signal conditioning for ADC @ 220VAV input

. 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

## Measurement of Noise Figure of LNA

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

## Problem on RMS output noise and input dynamic range of a transimpedance amplifier.

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..

## RMS Voltage Calculation

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 (...)

## input rms noise vs. input-referred noise

hi all, if the input rms noise of an amplifier is AVrms, 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 (...)

## Simulation steps for ota

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

## rms noise calculation

"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?

## Test bench to find Input referred noise

How to create Test Bench to find input referred noise of any block for example inverter/Dff. How to find rms noise of the circuit? Please comment..

## How to set noise spectrum to an input of the device?

There is a noise generator in analogLib.. You may set the rms noise voltage in properties menu..

## Noise measurement - control jitter measurement

Hi, I am designing a transmitter and I want to control jitter measurement by measuring noise on the input signal. Can I request anyone to please help and give me a code, as to how can I measure noise in the input signal for each clock period as I want to get Average voltage and rms voltage for each (...)

## how does the feedback affect the circuit noise performance?

In Gray's book, the feedback has no effect on the circuit equivalent input noise. But my question is, does the feedback have no effect on the circuit equivalent input noise rms value or the equivalent input noise spectral density? i.e. for a circuit with the feedback, does (...)

Hi, If you are given receiver sensitivity in dBm, you can't really get the gain of the TIA. From the receiver sensitivity, you can get how much the current amplitute and dc value. If you are given input noise current and output rms voltage noise, then only u can calculate the TIA gain. I suggest you to study on the Bezhad (...)

## TIA noise measurement in Bandpass response

Hi, I'm desigining a Transimpedance amplifier with the bandpass response, which means the differential output of the TIA is feedback to the input of the TIA for DC cancellation purpose. My question is, how do I calculate input referred rms noise of the TIA in Cadence. I understand that for the forward TIA design (LPF (...)

## how to measure the input-referred RMS noise voltage of ADC?

how to measure the input-referred rms noise voltage of ADC? for example, the input-referred rms noise voltage of pipeline ADC. thanks.

## how to estimate rms noise of ADC from histogram

an actual adc will produce additional codes outside the main bin for any dc input value ,due to the presence of noise, as show in following pic. this histogram is some like gaussian distribution. my question is how to get rms noise from this histogram, then get the effective bit of ADC thanks:D

## can i calculate BER from eye?

OK BER~=0.5*erfc(A/nois*sqrt(2)) where noise is rms noise voltage at desision circuit input A is eye opening at desision point I seen that it is relatively good estimation (but not exact calculation!) Regards

## Concerns about noise from LDO regulator for PLLs

I think 250uV rms is a little bit too much. Depends by your operating conditions that include regulator input and output voltage, bandwidth, load, quality of capacitors, etc. I would go for LT1763, which have 20uV rms

## about relation between amplitude of input signal and SNR

We know the SNR=(the rms of input signal)/(the rms of noise) (I) or . a input sine signal: Vpsin(wt) SNR=(6.02N+1.76) dB (II) It is not related between the SNR and the amplitude , only effected by the N. In the mean while, we (...)

## PWM DAC vs Delta-Sigma DAC

Both dacs need "mixed-signal" processes since the output stages need analog post processing! while pwm vaires the pulse width of the output linearly to the digital input (V_out rms ~ V_in_digital) , a sigma-delta dac has a more complex signal processing. the quantization noise of the pwm dac is constant over the whole spectrum, while due (...)

## How to measure an opamp's noise charaeterization?

The idea is simple. In general You need a true rms voltmeter and bandpass filter. Connect the OP in circuit that hi will be used, connect to the input ( in place of signal source) resistor ith the same impedance. Bandpass filter must be connected to the output of the OP circuit and after that connect the true rms voltmeter. In real the OP (...)