# Harmonic Distortion Simulation

100 Threads found on edaboard.com: Harmonic Distortion Simulation

## harmonic distortion simulation for switchcap sampling n/w

in my opinion, if u only are only careing about the switch's linearity, u can build a ideal switch and then compare the result of S/H with ideal swtich to the S/H with real switch. i think u will do FFT for the output of S/H to see any harmonic through the S/H network.

## secnod harmonic distortion in sigma delta modulator

The gain of CMFB also will influence 2nd harmonic.

## harmonic distortion calculation in spice

can someone tell how to do simulation in SPICE to calculate harmonic distortions in an opamp.

## How to do a harmonic distortion analysis with Hspice?

I just do the simulation with a MOSFET, and the vds=0. Add a Sinusoidal Source to the drain of the MOSFET and do the harmonic distortion. Please see the attachment to get the details. Thanks a lot!

## harmonic distortion in S/H circuit

1.6M over 5K =320. 320 is integer. So harmonic large even you use window function. U can select 5.01K input, and try it again.

## The procedure of the simulation of the Harmonic Distortion

Dear All, thank you for reading this topic. I just design an OTA and I will conect it to a capacitor to build a lowpass filter. Then I will put a 100mV sine signal at the input and want to see the harmonic distortion at the output. Does anyone show me the procedure that how can I get the result? A sample is put in the attchment and that is what exa

## how to measure Harmonic Distortion using MentorGraph EZ wave

hi presently i am worlking with Mentor graphic ELDO Spice for analog circuit simulation.for measuring specification of my amplifier i have to measure harmonic distortion(HD). i dn't know how to measure HD of a wave form by using EZ wave calculator of the mentor graphics .please guide me. Rgds Raju

## [ADS] Simulating harmonic distortion for MOS differential amplifier

Hi everybody, I'm having a little troubling simulating the harmonic distortion for a MOSFET differential amplifier with ADS. I am trying to calculate HD2, HD3, and the point at which the apparent gain drops by 1dB all for a 50mV signal at 100 MHz. I set up the circuit and added the harmonic Balance simulation block and set (...)

## THDN (total harmonic distortion + noise ) simulation of the Op-Amp

hello friends So far I was enquirer how to simulate or calculate the SNR. Now I would like to ask you how to simulate the THDN (total harmonic distortion plus noise) of the operational amplifier. Thank you and I appreciate very much your answers

## How to simulate distortion in pspice 5.0?

Definition of THD ----------------- Total harmonic distortion (THD) is the ratio of the harmonic power to the power at the measured peek. In the following equation, v1 is the RMS value at the peek frequency and v2, v3, ?, vn are RMS values at the harmonics. THD = sqrt (v2^2 + v3^2 + ? + vn^2) / v1 Definition of THD (...)

## fast sigma-delta modulator simulation with Cadence tools

Hi all! I've been designing a multi-bit sigma-delta modulator and now I am testing its performance with Element Selection Logic (modified Data Weighted Averaging (DWA) in my case). The circuits in the DWA are digital - log shifter, counter, regs etc. Right now I have added just the 16-bit log shifter to the schematics (the only part of DWA t

## about parameters simulation of opa

Hi everybody: I want to simulate the THD(harmonic distortion) and equivalent input noise of a opa, but how can I do it? thank you for your help.

## Submicron Transistor Distortion

Hi all, I'm starting a transconductor design using 0.13u CMOS, and I'd like to estimate the distortion, so I started to simulated the transistors. I apply a constant Vds, of 0.05V and I vary the Vgs to plot Ids, the gm, gm' and gm''. I assumed I~gm*Vgs+1/6*gm''Vgs^3, and tried to check with distortion simulation. I used the QPSS analisys (...)

## How to make opamp simulation of slew rate and fft

Hi ya! To simulation for slew rate, you will need to configure your opamp as noninverting unity gain buffer (closed-loop). Your input stimulus should a pulse waveform connected to the +input pin. Then run transient analyis and observe the output waveform vs input waveform. Your slew rate should be 10% from the rising edge to the 10% before it se

## How to calculate the 3rd harmonic distortion in Cadence?

Hi, I'm designing an op amp and want to calculate the HD3. The input signal is 1KHz. I found that there's a "dft" function in the calculator. But how to set the variables in it? ("from", "to" means what?) And how to get the HD3 from the dft result? btw: how long should I run the transient simulation to calculate the HD3? Thank you for your

hello all, i have designed a 10 bit ADC and i would like to simulate the major ADC characteristics.....but my knowledge in simulation of ADC characteristics is quite limited.......the characteristics i want to measure are the following: 1-DNL 2-INL 3-input offset voltage 4-Total harmonic distortion 5-Spurious Free Dynamic Range (...)

## Can anyone tell me something about harmonic balance?

HB is a frequency domain analysis , it work in the harmonics and solve the circuit response in frequency domain , so it is very good in nonlinear analysis like P1db , IIP3 , IM , and so on PSS is a time domain , so it is better in oscillators , and consume more time khouly

i am not sure but i think when they say HD they mean the harmonic(mul;tiples of fundemental) distortions and when they say IMD they mean non-tones distortion (non-harmonic distortion)

## THD simulation in Cadence Spectre

Hi, guys, How to simulate the total harmonic distortion (THD) in Cadence Spectre simulator? Many thanks, Ruri

Thx Alex_IC, after reading the notes above, I was still wondering..why pss can not continue but tran analysis can while no error is prompted? Is there any way else we can get the THD without running the PSS analysis? I have already tried the function "thd" in calculator, but the result seems not to be convincible. Anybody have some experience o

I am not yet exposed to ic6.x. What is done 5.x is: do an DFT of the output waveform which will give you the frequency spectrum of the output waveform. From the frequency spectrum you will be able to find the amplitudes of fundamental, harmonics and other noise components. There from you can calculate whatever you need. sankudey

Hi,everyone! I have a quesition about Cadence: I do not kown the difference between the component parameter sweep and model parameter sweep and how to use Cadence to test total harmonic distortion(THD)? thank you very much!

## PSS simulation for comparator in self oscillating system

I'm trying to simulate a Class D amplifier with hysteretic self-oscillating modulator but the PSS simulation is not acepting the configuration. Basically the self-oscillating system frequency (fs around 500 KHz) will be modulated by an audio signal (fin around 1 KHz) and fs will be varying from 450KHz to 550KHz but in a non-linear fashion since

## Harmonic distorsion in Orcad Pspice

No, you do not any easy alternate. You need to have model for that. Can you share the circuit you want to simulate, may be seeing that people comment on possible sources to introduce harmonic distortion in simulation.

## hi power dc-ac inverter designe

hi, i know this topic well. i am making an inverter for 120V AC (rms). you must choose a topology first. i would suggest a Full H-Bridge because of its current carrying capability. then you must create PWM switching for the elements. the switching elements should be MOSFETS at power levels of 500W or less. BJTs are for less than 1A projects

## Where do the harmonics come from in OpAmps?

harmonics are mainly contributed by the nonlinearity of the transistor constructing the Op-Amp, by reviewing the drain current equation of the transistor it could be observed that the relation of the input -output are in a manner of quadratic hence contributing to weighted frequency component also known as harmonic component.

## compare Spectre RF and ADS

I use both tools, as standalone and with RFDE. ADS is frequency basad simulator with a lot of stuffs to simulate complex signals SpectreRF is the RF IC design standard and is a time based simulator. In my opinion the two tools are complementary in some sense (and that's why Agilent and Cadence are working together into the RFDE integration).

## Shouldn the OP DC gain be the same as low freq. AC gain?

In Cadence try the lower amplitude and the lower frequency in the time domain and examine the output waveform for clipping and slew rate limiting. A harmonic distortion test should show up any distortions that you cannot see by eye.

## how to compute the SNR of ADC from the dft output?

I would recommend to print data to file and use Matlab - for me it's simplier.. About unequal freq beans - they can be slightly unqual due to nonidealities. Also I think that 1024 points may be not good enough for a proper freq resolution, especially if you look at freq near DC and the harmonic distortion of your ADC

## Help me with my design of tube amp with added gimmics

I am not shure your gimmics are OK. Pentode first grid current is about +800?A because of positive Ug1-c voltage of about 1.5V. This is may be possible because of very low Ug2-c voltage. Output voltage and frequency characteristics are OK but harmonic distortion is about 2%.

## Questions about sigma-delta harmonics in modulator

harmonic is not a key feature in sigma-delta modulator,because it will be shrinked by negtive feedback of integrator. A/1+AF. and you can also find out the harmonic distortion of op amplifier by Spectre pac analysis.(when there is a discrete time cmfb).

## [Help]Switched Capacitor filter and charge injection problem

GDF Do you have any suggestion for simulation to check the circuit does get rid of charge injection? Yes. To simulate charge injection in a modified SC (where a transmission gate is used), you need two sources (1) an analogous voltage source at the Drain of NMOS and Source of PMOS (2) a clock source to Gate of NMOS

## fft analysie in Hspice Vs. PSS in SpecterRF

thank your for your tips. I have noticed the spectrum leakage phenomenon, but so little help occured. another phenomenon in FFT analysis (Hspice): for a high gain amplifier (about 60dB), the input signal amplitude is very small. when doing fft analysis, the results indicate that the harmonic distortion will be improved with the increasing input

## How to simulatue a Gm-C integrator?

My question is how to extract the nonlinearity of a Gm-C integrator, i.e. THD (total harmonic distortion). SNR (Signal-to-Noise Ratio) and SDR (Signal-to-distortion ratio)? As my knowledge, these perforamnces are from the FFT of a signal. Does it need a tranisent simulation??? In some literatures, the performances (...)

## How to extract performances of a Gm-C integrator?

My question is how to extract the nonlinearity of a Gm-C integrator, i.e. THD (total harmonic distortion). SNR (Signal-to-Noise Ratio) and SDR (Signal-to-distortion ratio)? As my knowledge, these perforamnces are from the FFT of a signal. Does it need a tranisent simulation??? In some literatures, the performances 1dB (...)

hello all, i have designed a 10 bit ADC and i would like to simulate the major ADC characteristics.....but my knowledge in simulation of ADC characteristics is quite limited.......the characteristics i want to measure are the following: 1-DNL 2-INL 3-input offset voltage 4-Total harmonic distortion 5-Spurious Free Dynamic Range (...)

## Question about settling time of DAC

Could you tell me the DAC's power supply and output swing? The simulation result is right? Why the 5nH inductor's SFDR is better than others. I think if you use the cascode, the PSRR will not very bad. And the noise is not main cause for bad SFDR( if noise very large is the main cause). I think when you output swing change, the Vds of current M

my design requirement is SFDR>80dB.I had read some paper about it,most of them consider Vsb not equal 0 is the frist reason to design implement not support triple-well technology,so choose pmos transistor is the only choice to me.Using pmos means more bigger W/L than the counterpart in order to achieve same Ron. Firstly, large W/

## How to resolve a large odd harmonics issue in ADC?

I am designing a 10bit pipeline ADC. The schematic simulation shows that the odd harmonics are too large(especially,the third harmonic is 55dB). Can anybody give me some suggestion on how to find the reason? Thanks. sampling swith opamp (settling time) reference (settling time)

The harmonic may stem from the INL of the ADC. usually, INL manifest itself as harmonic distortion in the ADC (it's frequency depends on the INL graph).

## OTA design .... urgent help needed

The project aims at the design of a fully-differential OTA to be used as a unity-gain buffer in switched-capacitor filter applications. The expected load is 1 pF on each side as shown below. The amplifier is required to accommodate a maximum swing of 3 V differential- peak-to-peak running at 40 MHz and applied to the input of the amplifier. OTA?

## How to simulate the noise in time domain

i think two tone transcient simulation of the complete receiver is acceptable, donnot think about the harmonic balance simulation to simulate a system more than two blocks. some one really did simulate the noise performance by transcient, for example: Dennis Gee-Wai Yee of UCB in his PhD thesis (spring 2001) said he simulate the complete (...)

## How to suppress the 2-order tone in SDM?

2nd harmonic comes from signal-dependent noise thes signal-dependent noise may generated from 1. setting problem in SC 2. Vrefp/Vrefn was affect by signal (this will influence the feedback DAC) Especially the first stage. 3. Parasitic cap. form a different path in different signal amplitude, and the different path will make ur SC gener

## Help me with choosing topology and designing a 2.4GHz PA

Try to optimize your final stage bias line design to reduce the harmonica.

## Pic 16f876a Pure Sinewave inverter

I could give you a complete thesis with working design, but then you would not learn "how to learn." which is the whole point of your university education. Don't even need a PIC with Bubba Sine OScillator, comparator PWM, H bridge pre-drivers and H=bridge MOSFETs or IGBTs , filters, protection etc. But you can add a PIC, if you want.

## Simulation with ADS2004 (harmonic balance) hasn't show second harmonic

i think u need also to enter the SOI like the TOI , so SOI will make the even harmonics generated khouly can u upload the project khouly

## How to use spectre to run THD?

I am designing an opamp used in 20bit codec. But I do not know to set the parameters correctly to get the right THD (Total harmonic distortion). The spec requres the THD<-90dB. But the THD function applied to the output of spectre can only get about -47dB even the waveform is the idel sinusoid generated by the sine source. Can anyone give such a s

## which CAD tool is good for RF system design

golden gate is a harmonic balanced simulation engine , from agilent , it is for RFIC design khouly

## help me plz,how 25w mosfet audio amplifier works?

dear trapoe and FvM, i learned a lot of new useful things here... again thx for your attention and patient... i made a short circuit in the input and then simulated,in R11=270 MOS drains current comes to 109mA(is that the same as what i should do to achieve the desired current?),the picture below is showing the point: [url=images.elekt