Introduction to LTSPICE for Simulating 741 Op-Amp Amplifier and Low pass Filter Circuits



Издатель
This video shows how to simulate 741 Op-Amp Amplifier and Low pass Filter Circuits in LTSPICE. It:

[1] Briefly discusses how op-amps are modeled using macro-modelling techniques in circuit simulators such as LTSPICE (1:03)
[2] Identifies an appropriate 741 op-amp subcircuit model for use with LTSPICE (2:36)
[3] Shows how to create a symbol for the 741 op-amp in LTSPICE and link the symbol to the subcircuit model (4:03).
[4] Shows how to do dc operating point simulation of an op-amp amplifier circuit (9:13).
[5] Shows how to do transient simulation of an op-amp amplifier circuit (10:28).
[6] Shows how to do ac analysis simulation of a first order active low-pass filter circuit (13:26).

The ua741 subcircuit is below. Copy paste this subcircuit in a uA741.lib file. Place this subcircuit file in the folder
C:\Users\[USERNAME]\Documents\LTspiceXVII\lib\sub
--------------------------------------------------------------------


* Source: http://qucs.sourceforge.net/docs/tutorial/opamp.pdf (page 62)
*-----------------------------------------------------------------------------
* connections: non-inverting input
* | inverting input
* | | positive power supply
* | | | negative power supply
* | | | | output
* | | | | |
.subckt uA741 1 2 3 4 5
c1 11 12 8.661E-12
c2 6 7 30.00E-12
dc 5 53 dx
de 54 5 dx
dlp 90 91 dx
dln 92 90 dx
dp 4 3 dx
egnd 99 0 poly(2) (3,0) (4,0) 0 .5 .5
fb 7 99 poly(5) vb vc ve vlp vln 0 10.61E6 -10E6 10E6 10E6 -10E6
ga 6 0 11 12 188.5E-6
gcm 0 6 10 99 5.961E-9
iee 10 4 dc 15.16E-6
hlim 90 0 vlim 1K
q1 11 2 13 qx
q2 12 1 14 qx
r2 6 9 100.0E3
rc1 3 11 5.305E3
rc2 3 12 5.305E3
re1 13 10 1.836E3
re2 14 10 1.836E3
ree 10 99 13.19E6
ro1 8 5 50
ro2 7 99 100
rp 3 4 18.16E3
vb 9 0 dc 0
vc 3 53 dc 1
ve 54 4 dc 1
vlim 7 8 dc 0
vlp 91 0 dc 40
vln 0 92 dc 40
.model dx D(Is=800.0E-18 Rs=1)
.model qx NPN(Is=800.0E-18 Bf=93.75)
.ends
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