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Description:
This circuit uses two signal generators to simulate an Amplitude Modulated RF carrier wave. The output can be used to simulate the response of LC and tank circuits.
Notes:
Two signal generators are used in this circuit, one representing a high frequency (200kHz) RF carrier, VG2, the other signal generator is used to inject a 1KHz audio signal. The two signals are mixed and amplified by the transistor and an amplitude modulated signal appears at the collector of the BC548. The DC component is removed by C2 and R3 and the RF output now appears across the load resistor R3. Waveforms below are produced using Tina.
SPICE Netlist:
The spice netlist is shown below. Copy all lines between *AM and .END and paste into a new text file called vmod.cir or similar.
*AM RF modulator
.AC DEC 16 1 1.0MEG
.TRAN 4U 2M
.DC LIN VG2 0 1 10M
.PLOT V(3)
Vcc 1 0 30
VG2 2 0 DC 0 AC 1 0 SIN( 0 10M 200K 0 0 -90 )
VG1 4 0 DC 0 AC 1 0 SIN( 0 5 1K 0 0 -90 )
C3 5 0 100N
C2 6 3 470P
C1 2 7 100N
R5 0 7 15K
R4 7 1 56K
R3 0 3 1K
R2 4 5 4.7K
R1 1 6 10K
QT1 6 7 5 Q_BC548_N
.MODEL Q_BC548_N NPN( IS=16.9F NF=1 NR=1 RE=567M RC=1
+ RB=10 VAF=56.7 VAR=28.3 ISE=154F ISC=154F
+ NE=1.5 NC=1.5 BF=1.16K BR=5 IKF=29.5M
+ IKR=29.5M CJC=3.35P CJE=6.85P VJC=3.57 VJE=1.09
+ MJC=489M MJE=432M TF=796P TR=103N EG=1.11
+ KF=0 AF=1 )
.END
To produce an output in Spice Opus start the program and load the new vmod.cir The modulated signal appears across R3 which is now node 3 and earth. After loading the circuit the command "listing" will display the netlist. The command "run" will then simulate the circuit, "display" will print a list of all variables in the circuit. The command plot v(3) will display the AM wave between node 3 and 0 i.e. the load resistor R3.
Note to speed up simulation, the RF carrier has been limited to 200KHz only, and the output waveform just shows two complete cycles of the audio wave, i.e. 2ms as the modulating frequency is 1k. There will be some spice tutorials shortly on my pages.
Our other product:
Professional FM Radio Station Equipment Package
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es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org ->Afrikaans
sq.fmuser.org ->Albanian
ar.fmuser.org ->Arabic
hy.fmuser.org ->Armenian
az.fmuser.org ->Azerbaijani
eu.fmuser.org ->Basque
be.fmuser.org ->Belarusian
bg.fmuser.org ->Bulgarian
ca.fmuser.org ->Catalan
zh-CN.fmuser.org ->Chinese (Simplified)
zh-TW.fmuser.org ->Chinese (Traditional)
hr.fmuser.org ->Croatian
cs.fmuser.org ->Czech
da.fmuser.org ->Danish
nl.fmuser.org ->Dutch
et.fmuser.org ->Estonian
tl.fmuser.org ->Filipino
fi.fmuser.org ->Finnish
fr.fmuser.org ->French
gl.fmuser.org ->Galician
ka.fmuser.org ->Georgian
de.fmuser.org ->German
el.fmuser.org ->Greek
ht.fmuser.org ->Haitian Creole
iw.fmuser.org ->Hebrew
hi.fmuser.org ->Hindi
hu.fmuser.org ->Hungarian
is.fmuser.org ->Icelandic
id.fmuser.org ->Indonesian
ga.fmuser.org ->Irish
it.fmuser.org ->Italian
ja.fmuser.org ->Japanese
ko.fmuser.org ->Korean
lv.fmuser.org ->Latvian
lt.fmuser.org ->Lithuanian
mk.fmuser.org ->Macedonian
ms.fmuser.org ->Malay
mt.fmuser.org ->Maltese
no.fmuser.org ->Norwegian
fa.fmuser.org ->Persian
pl.fmuser.org ->Polish
pt.fmuser.org ->Portuguese
ro.fmuser.org ->Romanian
ru.fmuser.org ->Russian
sr.fmuser.org ->Serbian
sk.fmuser.org ->Slovak
sl.fmuser.org ->Slovenian
es.fmuser.org ->Spanish
sw.fmuser.org ->Swahili
sv.fmuser.org ->Swedish
th.fmuser.org ->Thai
tr.fmuser.org ->Turkish
uk.fmuser.org ->Ukrainian
ur.fmuser.org ->Urdu
vi.fmuser.org ->Vietnamese
cy.fmuser.org ->Welsh
yi.fmuser.org ->Yiddish
FMUSER Wirless Transmit Video And Audio More Easier !
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