LTspice IV: Noise Simulations

[@LinearTechnology]

To attach a curser to a waveform in LTspice you can left mouse clicking on the trace label and drag the curser to the appropriate location. Once you have an active curser a readout display becomes visible that will give you information on the location you have the curser. For more information on attaching cursors please review Waveform Viewer under Help Topics (F1).

[@eoinbeevers2597]

What are typical noise values for the input to headphones in V/Hz^(1/2). I got a value of 40 microV/Hz(^1/2), and am not sure if this value is too large to be practical.

[@riaanlaubscher814]

Are there guidelines for choosing the correct frequency band? It looks as though if a higher frequency is chosen, it would result in more noise according to spice but in real life the frequency response of the op-amp should reduce the signal at higher frequencies outside the GBWP?

[@DwiNoviantoUntidar]

How do we analyze the differential amplifier noise using LTspice? Thanks at first.

[@locombian]

How do you get the cursor window to read off the values of the graph?? Thanks

[@frosty129]

Damn useful. Thanks for uploading this.

[@SOUMAYAN]

What is the triangular component name

[@skcmkcsmith91]

How to let the LTspice calculate the noise votage for a given frequency band instead of noise spectrum density?

[@LinearTechnology]

Hello, please ask your question on our technical community at ez.analog.com/power/

[@FesZElectronics]

in the waveform viewer when you are displaying a noise trace, you can click on its name while holding the Ctrl key pressed and this will show a new window in which the RMS noise voltage is given for the displayed frequency band. If you are performing a .step simulation, you can also evaluate the RMS noise with a .meas statement to get the output in each of the stepped simulations.

[@power-max]

Noise is dependant upon temperature. What does LTspice assume as the temperature?

[@analogdevicesinc]

In general, LTspice examples do not simulate temperature (though temperature dependency can be defined). Customers can best get an understanding of the product performance over temp by reviewing the details in the datasheets which are based on actual results and guaranteed. For additional support please visit our online technical community at ez.analog.com/

[@flashdrc]

I think what's being asked here is what is the default temperature, which is 27 C. It can be changed by adding a SPICE directive (.op) with the text .temp 100, which sets the temperature to 100 C.

[@basavarajeshwarichoudri9098]

How to butterfly curve in ltspice

[@CN3891]

The tutorial is great but I’m gonna Shazam that intro music

[@basavarajeshwarichoudri9098]

How to draw butterfly curve or diagram for 6T SRAM