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## 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..

## why the phase noise is greater than 0 dBc/Hz

Hi I am using cadence pnoise for VCO (ring) simulation. Why my pnoise is greather than 0 dBc as the offset is close to 0? It is also 60 dBc at 1 Hz. Is it correct??

## Noise summary of LNA in Cadence

hello, I am trying to simulate UWB LNA in 65nm process with UMC65 model file.I am using n_12_lllvtrf transistors. I checked the noise summary in ADE in noise summary it is showing m1.recn thermal_noise i am not able to understand what is m1.recn noise. It is also giving (...)

## What value of port impedance should be in Noise simulation with Cadence Spectre?

Hi guys, I've gotten something unsure about noise factor. Hope for help here. The noise Factor is defined as below. N = (Na+G*Ns)/(G*Ns). Different Ns produces different N. And in cadence spectre, the noise source is usually a port. The impedance of the port provides the thermal noise 4kTRB V^2, (...)

## Dynamic Link for phase noise simulation problem

Dear All, I'm using ADS Dynamic Link to simulate an LC oscillator schematic from cadence(using ibm130nm PDK). With the ADS HB simulation, all the simulation results such as oscillation freq are obtained correctly except for the phase noise(pnmx). When I list the pnmx in the result browser window, the value shows "NaN". Can anyone tell me what is

Hi folks, Anyone know how to introduce a pulse with some jitter!!, by jitter I mean , variation in rising edge of the pulse(square wave pulse ) I tried to input a sawtooth and a DC voltage to a comparator , and get square wave pulse at output, now if I can add some noise to sawtooth,theoritically I should get a pulse with variation of ris

## operation of current bleeding mixer

The most important parameters of a mixer that need to be measured are: -Conversion Gain or Loss -Linearity (Input Intercept Point as IIP3) -Spurious products -Ports Isolation -noise Figure

## Is dcmatch analysis in Cadence useful?

With Monte Carlo you might have to run 30-100 simulations before you got a good estimate of the standard deviation (SD) due to random mismatch. On the other hand, DC match is a sensitivity analysis that is much like a noise analysis. It will give you the SD in a single simulation, making it very useful for large circuits. The downside is that you o

## frequency characteristic of pseudo-random sequence

Is it the same as the white noise which means the power is equally divided in the whole frequency range? If so, how does it come? Any reference is preferred. Now I've built a pseudo-random sequence using linear feedback shift register(LFSR), and I'd like to check its power spectral, is it possible to make it out using cadence and how? Thank you

## Problem with noise analysis in cadence?

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.

## PSS and Pnoise Simulation setup for frequency dividers in Cadence

Hi, I am trying to simulate the phase noise of a bunch of frequency dividers. My oscillator runs at 12-17 GHz. I use frequency dividers to generate quadrature signals and cover the desired frequency bands. Currently I am using a divide-by-2 conventional CML divider followed by two divide-by-2 and divide-by-3 frequency dividers to cover two bands

## substrate noise analysis

is it possible to analyze the substrate noise in cadence? if not, can you suggest another software to analyze the substrate noise? Thanks in avance

## how to simulate LDO noise?

Please use .noise and sweep the frequency.

## Preamplifier noise specifications

Hai, I want to calculate the following two quantities for my preamplifier with cadence tool. Can anybody give me the procedure? 1. Total input referred noise voltage Power Spectral Density @1Hz & @100Hz. 2. Total input referred r.m.s noise voltage (1 Hz - 100 Hz) Suggest me acceptable range of the above two quantities (...)

## phase noise analysis of ring oscillator with cadence rf

Hey I´d like to do a phase noise analysis with cadence virtuoso. In my pss analysis the estimated frequency (direct plot harmonic frequency) does not match to the beat frequendy i´ve entered in the simulation set up file. to set up the simulation i followed the spectre rf workshop. what could be the problem there? regards zitty

Hi I'm using cadence and when I make a noise summary (to obtain the noise for each transistor) I get 4 components. fn and id I know, what rd and rs please? Thanks

## how to measure parameters of a operational transconductance amplifier(OTA) design

1）~3） AC simulation or STB analysis 4) DC sweep 5) transient 6) DC sweep 7) noise analysis

## How to simulation PLL loop filter noise by cadence spectre

Dear all, How to simulate PLL loop filter noise by cadence spectre? I used 3ord LPF in PLL. As attached figure, dashed lines are resistors noise in LPF and solid lines are output noise after transfer function. Who can help me about LPF noise simulation by cadence spectre. thank you (...)

## noise and power optimization for sigma delta adc at low frequencies

hi everyone,im going to do device noise analysis for the sigma delta adc in cadence tool and hence optimizing the design in noise and also in power.please help me with your ideas and suggest any useful books or papers on noise optimization for each of the blocks in sigma delta adc or any papers on flicker (...)

## Sampled Mode of PAC or PXF in Cadence Spectre

Sampled Mode exists in PAC and PXF of cadence Spectre. This mode is similar to "timedomain" mode in Pnoise Analysis of cadence Spectre. The Designer's Guide Community Forum - switched capacitor integrator noise simulation results However I can't get reasonable results for