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## [Moved]: Divider pnoise in the PLL

Hi, i want to get the overall pnoise of the PLL in Matlab, so i firstly stimulus the pnoise of several components in the cadence ADE, the simulation pnoise of Divider is about -120~-130dBc/Hz, and the noise power spectral density is about -160~-170dB/sqrt(Hz), i want to know is it normal? if (...)

Since you are saying its a switching technique based offset cancellation. Your should be using periodic steady state methods. PSS/Pnoise will help you,

## CS Differential LNA simulation problem !

generally the noise figure of differential LNA is lower than single ended.Wrong. NF of differential amplifier is always larger since noises are uncorrelated. Do u think baluns add noise to circuit?If you use "analogLib/ideal_balun" in cadence dfII, it is noiseless.

## S Parameter in spectre and ADS

See You can see a defintion of NF(k) in Keysight ADSsim and GoldenGate. If you use more than three ports, e.g, port1=RF, port2=IF, port3=LO, NF(2) is different from NF of cadence Spectre. Here you have to use resistor + vsin instead of port3=LO.

## how to simulate the input refered noise of an integrator in cadence/spectre

As the figure shows, do the noise simulation, but the output and negative input node of the amplifier is not "directly" biased, how to get the input referred noise data from simulation? Thanks 129361

Hello, As you know, PVT simulation is process, voltage and temperature. About process simulation, you can use monte carlo simulation ( samples > 10). To voltage simulation, you will change voltage supply. For example, voltage supply is 3.3 V, you can run 3.2-3.4V and may be plus Vsin (noise). To (...)

## Opamp input current noise simulation in cadence

I suppose you want to simulate this in a true application, meaning the inputs are controlled by a generator with known output impedance? In this case connect the inputs with noiseless resistors to the required bias voltage. Or subtract the resistors noise, if you can't find noiseless resistors in your libs.

## [Moved]: Problems in simulation noise of amplifier

Probably the bandwidth of your opamp is smaller than flicker noise corner frequency?

## XO simulation: HB convergence issue

Hi all, I'm currently work on an oscillator using XO. I want to characterize the phase noise and I've some strange behavior. I've set the simulator by following the link below. Using HB and HB noise, f

## thermal noise simulation in cadence virtuoso IC 616

Hi I have found the following thread, which i am trying to understand currently. In that they tried to measure the thermal noise of a resistor. I have a doubt in that, Do we need to connect any source to this transistor or we just use the resistor without any sources before calculating noise.

The noise figure obtained by simulation with ADE L increases after and upgrade from release 6.1.5 to 6.1.6.080 of cadence Virtuoso. The design kit is the same for both releases. Any one who had a similar problem and who may know its origin ? Regards, Aba

## Relaxation Oscillator Jitter Simulation in cadence - Eye diagram confusion...

Dear All, I am designing a conventional relaxation oscillator. The moninal frequency is around 2.85 MHz. When I try to run the transient noise simulation and use calculator to obtain the eye diagram, I got some weird diagram and i am very much confused. Attached you can see some waveforms obtained using the function eye diagram. The se

## 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 function. The (...)

## Noise correlation simulation in pnoise

Hi, 1. I am using IC6.1.6-64b.500.1 and my simulator version is 10.1.1.296.isr18 64 bit 2. I am simulating a basic downconversion mixer as shown in attached figure. I want to know the correlation between noise at RF (red) and noise at IF (blue). I tried to follow the following article:

## Minimum Detectable Photocurrent- Image sensor- Post Layout simulation- cadence

This is a many-layered question and one which simulation can only approximate. Minimum detectable, vs minimum -reliably- detectable, just by itself, has dark current, telegraph noise, detector circuitry threshold / noise contribution aspects. Not that almost all of these push into areas that often are poorly modeled or not well modelable (...)

## designing a delay circuit using cmos logic

hello ...i tried many circuts like cascading of inverters Hi, for simulating your ring oscillator, I think in cadence ADE, you need to set simulation-> Convergence Aids-> Initial condition-> click on say the o/p node of the oscillator->apply '0 V' in the dialog. This will help in adding the initial noise for oscil

## Cadence 6, distribute tran noise job on multiple cpu

Dear all, anyones whos knows how to distribute a tran noise simulation jobs on different cpus? How to distribute the intial seed? thx.

## how to calculate noise factor in cadence?

I am using spectre to measure the noise performance of my schematic with spectre in cadence . I wonder how the software to calculate the noise factor with the input noise and output noise . The simulation results show that noise factor doesn't equal to output (...)