JOLANTA CIEŚLA Rzeszów, 02.06.2014r.
JERZY HOWICKI
ADAM KOKOT
ET-DI
L3
Laboratorium z Projektowania Układów (CAD)
Modulator FM
Źródło VSFFM.
Program PSpice umożliwia wstawienie gotowego elementu, jako modulator FM. Źródło to nazywa
się VSFFM (Frequency Modulated Sinusoidal Voltage Source Model).
Schemat zastępczy symulowanego elementu.
Wyniki symulacji.
analiza czasowa
Nastawy źródła:
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 5 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 2.5 | 1 | 100k | 5 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 2 | 100k | 5 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 200k | 5 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 2 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 5 | 5k |
Przebiegi czasowe w małym stopniu pokazują modulację FM. Aby ją lepiej zaobserwować stosuje
się analizę widma poprzez szybką transformatę Fouriera (FFT – Fast Fourier Transform).
Analiza FFT
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 2 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 200k | 2 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 2 | 20k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 200k | 2 | 20k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 1 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 2.4 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 3 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 4 | 10k |
| VOFF | VAMPL | FC | MOD | FM |
|---|---|---|---|---|
| 0 | 1 | 100k | 5 | 10k |
Netlista.
* Schematics Netlist *
R_R1 $N_0001 0 1
V_V1 $N_0001 0
+SFFM 0 1 100k 5 10k
Zawartość pliku .out.
**** 06/02/14 20:06:59 *********** Evaluation PSpice (Nov 1999) **************
* C:\Users\ADAM\Desktop\CAD\vsffm\vsffm.sch
**** CIRCUIT DESCRIPTION
******************************************************************************
* Schematics Version 9.1 - Web Update 1
* Mon Jun 02 20:06:57 2014
** Analysis setup **
.tran 5ns 200u SKIPBP
.OP
.STMLIB "vsffm.stl"
* From [PSPICE NETLIST] section of pspiceev.ini:
.lib "E:\Program Files\OrCAD_Demo\Capture\Library\Pspice\eval.lib"
.lib "E:\Program Files\OrCAD_Demo\Capture\Library\Pspice\NOM.LIB"
.INC "vsffm.net"
**** INCLUDING vsffm.net ****
* Schematics Netlist *
R_R1 $N_0001 0 1
V_V1 $N_0001 0
+SFFM 0 1 100k 5 10k
**** RESUMING vsffm.cir ****
.INC "vsffm.als"
**** INCLUDING vsffm.als ****
* Schematics Aliases *
.ALIASES
R_R1 R1(1=$N_0001 2=0 )
V_V1 V1(+=$N_0001 -=0 )
.ENDALIASES
**** RESUMING vsffm.cir ****
.probe
.END
**** 06/02/14 20:06:59 *********** Evaluation PSpice (Nov 1999) **************
* C:\Users\ADAM\Desktop\CAD\vsffm\vsffm.sch
**** SMALL SIGNAL BIAS SOLUTION TEMPERATURE = 27.000 DEG C
******************************************************************************
NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE
($N_0001) 0.0000
VOLTAGE SOURCE CURRENTS
NAME CURRENT
V_V1 0.000E+00
TOTAL POWER DISSIPATION 0.00E+00 WATTS
**** 06/02/14 20:06:59 *********** Evaluation PSpice (Nov 1999) **************
* C:\Users\ADAM\Desktop\CAD\vsffm\vsffm.sch
**** OPERATING POINT INFORMATION TEMPERATURE = 27.000 DEG C
******************************************************************************
JOB CONCLUDED
TOTAL JOB TIME .95
Zawartość pliku .cir.
* C:\Users\ADAM\Desktop\CAD\vsffm\vsffm.sch
* Schematics Version 9.1 - Web Update 1
* Mon Jun 02 20:06:57 2014
** Analysis setup **
.tran 5ns 200u SKIPBP
.OP
.STMLIB "vsffm.stl"
* From [PSPICE NETLIST] section of pspiceev.ini:
.lib "E:\Program Files\OrCAD_Demo\Capture\Library\Pspice\eval.lib"
.lib "E:\Program Files\OrCAD_Demo\Capture\Library\Pspice\NOM.LIB"
.INC "vsffm.net"
.INC "vsffm.als"
.probe
.END
Przykładowy modulator FM.
Symulowany obwód.
Wyniki symulacji.
Wyszukiwarka