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Simulator-programi i modeli...
#55
Odlično pitanje @vulejov

THD
-tačnost simulacije=tačnost upotrebljenih spice modela

Što bolja preciznost u spice modelu, to bolje se simulacijom približimo realnom "sranju" - ups, stanju...
To ti Braca može detaljnije i opširnije razložiti, nekoliko simulacijskih programa su sa ekipom usavršili,
jeste da za drugu branžu, kompresori, klip motori... ali to sa upotrebom elektronike, šta ima veze?
Pa sve su tu neki elementi koje opišemo linearnim stavkom, ovaj pohranjuje energiju, ovog čemo opisati nekim diferencijalnim...itd.
Na kraju može biti skoro isti SW engine, GUI malo promenimo, fensi-šmeksi...i evo ti "novi" simulator...

-----------------------------------
TinaTI simulacija (ili neki drugi simulator, nebitno!)
Tu je još par VRLO bitnih stavki:

-use Zero initials values u analizi transicije (ovo ostaje dalje i za sve kasnije simulacije)
-Calculate operating point (da se sklop fino umiri...), za analizu starta ima se posebna analiza za to!
-Sampling start time (100msec ili više)

U onoj shemi je u napajanju još dodatni voltage sourse sa amplitudom 1Vpeak i 100Hz za potrebe simuliranja PSRR.
TinaTI u fazi Fourierove vrste prečekira shematik i uzme sig.gen najmanje freq u izračun.
Mi smo fino stavili na ulaz recimo 170mVpeak @20KHz a THD nam pokazuje enormni distorsion jer izračun radi na 100Hz!

THD analysis:
Zero initials values
Calculate operating point
Sampling start time 250msec
Base freq neka je ista koju imamo i na sig.gen na ulazu
-----------------------------------
Izlaz @4Vpeak, 1KHz, 8R0 = 1Wrms (avarage, effective, jer rms snaga nema...)
THD_1KHz cca 0,0001%
Izlaz @4Vpeak, 20KHz, 8R0
THD_20KHz cca 0,003%

Ovo na 20KHz je sasvim za očekivati,
BW imamo limitiran, pa nam predstavlja neki viši harmonik osnove 20KHz da je van BW, stime če biti i njegova odsupanja/THD veča.

II.harmonik ranga 20uV, -106dB = 20log (U_II.har / U_base freq)
III.harmonik oko 50uV, -98dB

...

sad bi trebali viši harmonici opadati, ali nije tako kod THD analize na višim freq.
X.harmonik na skoro 100uV
XIV. čak oko 50uV a trebali bi fino opadati, tu bi očekivali ispod 1uV ako bi BW bio oko par MHz!!!
LP
Dragan
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Messages In This Thread
RE: Simulator-programi i modeli... - by TDA - 08-11-2014, 06:31 PM
RE: Simulator-programi i modeli... - by mikikg - 08-11-2014, 07:32 PM
RE: Simulator-programi i modeli... - by TDA - 08-11-2014, 07:54 PM
RE: Simulator-programi i modeli... - by mikikg - 08-11-2014, 09:04 PM
RE: Simulator-programi i modeli... - by samuki - 08-11-2014, 10:37 PM
RE: Simulator-programi i modeli... - by samuki - 08-12-2014, 11:08 PM
RE: Simulator-programi i modeli... - by Dragan100 - 08-11-2014, 10:37 PM
RE: Simulator-programi i modeli... - by TDA - 08-11-2014, 11:00 PM
RE: Simulator-programi i modeli... - by Dragan100 - 08-11-2014, 11:16 PM
RE: Simulator-programi i modeli... - by Braca - 08-12-2014, 09:36 AM
RE: Simulator-programi i modeli... - by Dragan100 - 08-12-2014, 12:23 PM
RE: Simulator-programi i modeli... - by Braca - 08-12-2014, 01:25 PM
RE: Simulator-programi i modeli... - by Dragan100 - 08-12-2014, 01:30 PM
RE: Simulator-programi i modeli... - by TDA - 08-12-2014, 01:11 PM
RE: Simulator-programi i modeli... - by Braca - 08-12-2014, 01:39 PM
RE: Simulator-programi i modeli... - by TDA - 08-15-2014, 06:18 PM
RE: Simulator-programi i modeli... - by Braca - 12-08-2014, 07:53 PM
RE: Simulator-programi i modeli... - by Braca - 12-21-2014, 09:27 PM
RE: Simulator-programi i modeli... - by TDA - 12-21-2014, 10:10 PM
RE: Simulator-programi i modeli... - by Braca - 12-21-2014, 10:29 PM
RE: Simulator-programi i modeli... - by samuki - 12-21-2014, 11:05 PM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 12:13 AM
RE: Simulator-programi i modeli... - by Aca93 - 12-21-2014, 11:06 PM
RE: Simulator-programi i modeli... - by dlalkovic - 12-22-2014, 09:27 PM
RE: Simulator-programi i modeli... - by Braca - 12-21-2014, 11:43 PM
RE: Simulator-programi i modeli... - by Aca93 - 12-22-2014, 12:18 AM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 12:44 AM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 08:10 PM
RE: Simulator-programi i modeli... - by samuki - 12-22-2014, 08:23 PM
RE: Simulator-programi i modeli... - by Braca - 12-22-2014, 09:28 PM
RE: Simulator-programi i modeli... - by Dragan100 - 12-23-2014, 10:10 AM
RE: Simulator-programi i modeli... - by Braca - 12-23-2014, 11:16 AM
RE: Simulator-programi i modeli... - by Dragan100 - 12-23-2014, 10:15 AM
RE: Simulator-programi i modeli... - by Dragan100 - 12-23-2014, 03:55 PM
RE: Simulator-programi i modeli... - by Dragan100 - 12-24-2014, 09:01 AM
RE: Simulator-programi i modeli... - by Dragan100 - 03-04-2016, 04:53 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-05-2016, 10:57 PM
RE: Simulator-programi i modeli... - by vulejov - 03-06-2016, 08:46 AM
RE: Simulator-programi i modeli... - by vulejov - 03-06-2016, 04:30 PM
RE: Simulator-programi i modeli... - by Braca - 03-06-2016, 11:05 AM
RE: Simulator-programi i modeli... - by Dragan100 - 03-06-2016, 06:52 PM
RE: Simulator-programi i modeli... - by vulejov - 03-06-2016, 09:57 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-06-2016, 10:24 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-08-2016, 05:11 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-08-2016, 06:39 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-11-2016, 03:35 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-11-2016, 04:00 PM
RE: Simulator-programi i modeli... - by vulejov - 03-23-2016, 08:16 PM
RE: Simulator-programi i modeli... - by Dragan100 - 03-23-2016, 08:48 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 12:26 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 03:09 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 06:32 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 08:12 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 08:48 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 09:13 PM
RE: Simulator-programi i modeli... - by Braca - 04-09-2016, 11:26 PM
RE: Simulator-programi i modeli... - by vulejov - 04-10-2016, 09:04 AM
RE: Simulator-programi i modeli... - by Braca - 04-10-2016, 10:20 AM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 09:56 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-09-2016, 09:24 PM
RE: Simulator-programi i modeli... - by vulejov - 04-09-2016, 09:29 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-10-2016, 12:53 PM
RE: Simulator-programi i modeli... - by vulejov - 04-10-2016, 01:15 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-10-2016, 06:37 PM
RE: Simulator-programi i modeli... - by vulejov - 04-10-2016, 08:48 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-10-2016, 10:58 PM
RE: Simulator-programi i modeli... - by vulejov - 04-11-2016, 05:27 AM
RE: Simulator-programi i modeli... - by Dragan100 - 04-11-2016, 11:28 AM
RE: Simulator-programi i modeli... - by vulejov - 04-11-2016, 02:52 PM
RE: Simulator-programi i modeli... - by Dragan100 - 04-11-2016, 06:47 PM
RE: Simulator-programi i modeli... - by vulejov - 04-11-2016, 09:02 PM
RE: Simulator-programi i modeli... - by Braca - 04-12-2016, 09:17 PM
RE: Simulator-programi i modeli... - by vulejov - 04-13-2016, 07:17 AM
RE: Simulator-programi i modeli... - by mikikg - 04-13-2016, 08:35 AM
RE: Simulator-programi i modeli... - by mikikg - 04-15-2016, 10:29 PM
RE: Simulator-programi i modeli... - by Robert63 - 04-15-2016, 10:52 PM
RE: Simulator-programi i modeli... - by Leonardo - 11-24-2016, 08:43 AM
RE: Simulator-programi i modeli... - by vsavic - 01-02-2017, 12:48 AM
RE: Simulator-programi i modeli... - by Braca - 08-02-2019, 10:58 PM
RE: Simulator-programi i modeli... - by Braca - 08-03-2019, 11:45 AM
RE: Simulator-programi i modeli... - by Dragan100 - 08-03-2019, 12:12 PM
RE: Simulator-programi i modeli... - by Braca - 08-04-2019, 08:59 AM
RE: Simulator-programi i modeli... - by Braca - 01-20-2020, 09:24 AM
Simulator-programi i modeli... - by mikikg - 05-31-2013, 06:09 AM
Simulator-programi i modeli... - by mikikg - 05-31-2013, 09:13 AM

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