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From: Holger V. <hol...@un...> - 2006-12-03 00:25:25
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Michele Giugliano schrieb: > Dear All, > > In the context of **TRANSIENT** spice simulations, I would like to > inject a fluctuating waveform by a some kind of current source, > producing a fluctuating current defined as in an Ornstein-Uhlenbeck noise. > > This is basically a gaussian white-noise filtered by an RC filter. As a > consequence, a "white-noise generator" would be the best for me. > > Can someone point me towards the right resources and examples ? > > Thanks in advance > Michele > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > Ngspice-users mailing list > Ngs...@li... > https://lists.sourceforge.net/lists/listinfo/ngspice-users > > > Dear Michele, attached you will find a patch to the VSRC voltage source (to be found in /src/spicelib/devices/vsrc of ng-spice-rework-17). This patch will install a new option to the vsrc voltage source offering gaussian white noise for transient simulation. The command to involve noise with voltage source is VNoi 1 0 DC 0 NOISE(20n 0.5n 0 0) (see new_noise_test.cir). In NOISE(NA NT NCF NS) NA is the amplitude, NT is the time between sample values (may be overriden by TSTEP from the .TRAN TSTEP TSTOP command , CF and NS may later be used for 1/f noise (not yet implemented). Some theoretical input is still needed to get the correlation between NA, NT and the spectral density of the noise voltage. Testing of this option in circuits is needed as well. The impelementation of noise into the current source isrc is straighforward. I will try to figure out how 1/f noise may be handled. Please report some results on this option. Regards Holger Regards Holger |