Search Engine www.edaboard.com

## can i use hspice to simulate the WBLNA

now, i am doing a project about a wideband low noise amplifier. but i haven't any tools,i only know that cadence'spectre can doing this ,so is there any others can doing this ,i have hspice in my pc ,so i ask whether hspice can doing this .and how to set the parameter to simulate the LNA.

## Question about phase noise simulation of ring VCO

I design a Ring VCO and use cadence pss pnosie simulate its phase noise. There is a strange simulation result. The phase noise curve is not always down with -20dBc /dec. From 100KHz the curve become a straight line . See belowing pic. I don't

## Question about noise in complex(polyphase) filter

I have made a 3rd order complex filter , when performing noise analysis using cadence , i put noise sources at both the inputs of I and Q channel , and saw the output noise at the I or Q channel , it was 45nV/sqrt(hz) . when i measured the input referred noise at the I or Q channel , it was about (...)

## plotting Ic versus Gain, Ic versus NF and Ic versus iip3 for

hi all i am aboslutely new to rf design using design. can someone help me with schematics to simulate the gain vs collector current, the noise figure versus collector current and iip3 versus collector current for a bjt in cadence? Also a basic circuit to plot the I-V Characteristics of bipolar as required in cadence. Also how can i plot (...)

## Positive Phase Noise in Spectre PSS

I think this is because the computing method uesed to calculate the phase noise was not accurate in low frequency.You can check the cadence file about it.

## how to calculate jitter in cadence virtuso?

To simulate the total jitter you need to run the whole PLL loop for many cycles which might take weeks in some cases. The more practical approach is to take the obtain the individual phase noise curves of PFD-CP, VCO, Divider, LPF and the XO, know the transfer function, manipulate and get the total phase noise curve, integrate and get the jitter. I

## How to measure input noise of an OTA in cadance?

How to measure input referred noise of an OTA in cadence. Thanks in advance.

## noise analysis in cadence Analog Design Environment

Run S-parameter analysis and select noise option.

## design of Delta Sigma in simulink

im designing discrete time DSM. i know circuit design but prob. with simulink, how do we get noise plots in simulink as others get. can you please provide me a complete example of 2nd order low pass SDM in simulink with gain parameters. when i did ,it was going way hign in magnitude after the 2nd integrator. thanks for your reply.

## about phasenoise simulation of pll

read \$CDS_TOP_DIR/MMSIM/doc/spectreRFvol2/spectreRFvol2.pdf regarding noise-aware PLL design flow

## design of CMOS low noise amplifier

Hello, I have designe a low noise amplifier, but I don't know if my procedure is correct, is there someone that can help me? in attached there is the circuit. Thank you

I can't find any cadence tutorials that discuss these topics : --> noise simulation --> Process Corners simulation --> How to plot gain against Id and stuff like that such as gm/id

## design of low noise amplifier in 'TECH_C35B4'

Hello, I have a great problem...I have to design a low noise amplifier , who has the following features: 1)V DD = 3V 2)Zindiff = 200Ω (RSdiff = 200Ω) 3)I BIAS = 5mA 4)f 0 = 1.8GHz 5) All the transistor should have minimum legth -I have to use a differential amplifier what can I do to design this LNA?? Where can I find the r

## Strange warning in 'pnoise' simulations with IC613(ADE-XL)

Hello All, I am trying to analyze phase noise for a design involving cross-coupled LC oscillator. I am able to get the PSS working, however, the pnoise analysis throws up a strange warning. I have attached the simulator log file. I tried implementing the suggestion posted at

## 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..

## CADENCE SPECTRE HELP --- JITTER CALCUATION

two ways: 1. Inject the noise into supply, and measure the vco cycle time, then do statistical analysis 2. Do Pnoise analysis then integrate between frequency range

## Calculation of noise figure

When I simulate the noise performance of an amplifier using cadence Spectre, I can get the values of output noise voltage (Vn,out) and noise figure (NF). But I use the formula NF=square(Vn,out/A)*1/(4kTRs) (A is the voltage gain.) the result of NF is different with the simulation result. Why?

## Transistor noise current simulation in spectre/cadence

Do you know how to measure the noise current of a transistor in saturation? I bias the mos in sat region then how to specify/manage the probes in noise analysis.

## Mixer NF Simulation problems in Spectre

Hello people, I am having some trouble simulating the NF of a mixer I designed. I am trying to simulate its performance using spectre Periodic noise Figure analysis (combined with PSS of course), in the ways described both in cadence's app note ( ) and in a tutorial from a Sweden University

## where can find an existing LDO design?

Hi all Can anyone give me an existing LDO design which can be run in cadence? Thanks Added after 1 hours 59 minutes: Hi all Can anyone give me an existing LDO design which can be run in cadence? Thanks I design a LDO myself, but the output noise is pretty high, about 1