Index: trunk/doc/tutorial/simulation/sim/18_opamp_ac/18_opamp_ac.svg =================================================================== --- trunk/doc/tutorial/simulation/sim/18_opamp_ac/18_opamp_ac.svg (nonexistent) +++ trunk/doc/tutorial/simulation/sim/18_opamp_ac/18_opamp_ac.svg (revision 8811) @@ -0,0 +1,1322 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Index: trunk/doc/tutorial/simulation/sim/18_opamp_ac/index.html =================================================================== --- trunk/doc/tutorial/simulation/sim/18_opamp_ac/index.html (nonexistent) +++ trunk/doc/tutorial/simulation/sim/18_opamp_ac/index.html (revision 8811) @@ -0,0 +1,68 @@ + + +

18_opamp_ac: 2 slot opamp

+ +

Scope

+

+A notch filter built with two opamps: this filter passes signals between DC +and 100 kHz but filters out 1 kHz signals. Demonstrated using a slotted +opamp with simulation. + +

The schematics

+

+

+ +
Click the image to get the sch-rnd sheet; also requires this project.lht in the same directory
+

+More info on the circuit: www.electronics-tutorials.ws + +

Preparing for simulation

+

+The lm358 contains two opamps in a single physical package. For the PCB +workflow this is going to be a single footprint with 8 pins. For spice +simulation, two separate components are exported, one per slot. The problem is: +only slot 1's power terminals are connected! This is no problem for the +PCB workflow, where a physical connection between slots exists within the package. +For simulation, the trick is to set spice/shared on the power terminals on both +slots (4 terminals total). This tells sch-rnd to share the connection between +the same numbered terminals of different slots of the same symbol. +

+Other than this, everything else about the drawing is pretty much the same as in +12_bjt_amp_ac. + +

Modifications

+

+This circuit needs three voltage sources, which are both added as modifications. +The first one is a DC 5V source connected to net Vcc (and GND). The second is +a DC -5V source connected to net Vneg (and GND). These are the power supply +rails of the opamp. +

+The third source is connected to the net in (and GND) and acts as the +small signal AC source for the AC analysis, this it has a an AC value (of 0.1 V) + +

Sim setup: output config

+

+(Same as in example 06_passive_ac ) +

+This simulation has two output configs, one for displaying the transfer +(in decibel) and one for the phase (in radian). The reason for specify them +in two separate output is the largely different y scale and unit. +

+The first output uses ac (dec) for analysis. This will feed in 10 +different frequencies per decade and caputre the output. This also means +the X axis, frequency, is logarithmic (common for frequency domain analysis). +

+The property to plot is vdb(out), which is the "voltage decibel" of +the network called out. Instead of the net name a component-port could be +specified within vdb(). +

+The second output uses anlaysis previous, which means no new simulation +is ran, but the data of the previous simulation is used. The presentation is +also a plot of "out", but using the cph() function, which is the phase in +radian. +

+

+ +
Simulation setup dialog, third tab, after execution
+

+ Index: trunk/doc/tutorial/simulation/sim/18_opamp_ac/sim_run.png =================================================================== Cannot display: file marked as a binary type. svn:mime-type = application/octet-stream Index: trunk/doc/tutorial/simulation/sim/18_opamp_ac/sim_run.png =================================================================== --- trunk/doc/tutorial/simulation/sim/18_opamp_ac/sim_run.png (nonexistent) +++ trunk/doc/tutorial/simulation/sim/18_opamp_ac/sim_run.png (revision 8811) Property changes on: trunk/doc/tutorial/simulation/sim/18_opamp_ac/sim_run.png ___________________________________________________________________ Added: svn:mime-type ## -0,0 +1 ## +application/octet-stream \ No newline at end of property