In this topic:
|Model Name:||Summers (Version 8.0+)|
|Simulator:||This device is compatible with the SIMPLIS simulator.|
|Parts Selector Menu Locations:||
|Multiple Selections:||Multiple devices can be selected and edited simultaneously.|
This symbol and editing dialog was introduced with version 8.0. While the model will simulate in versions prior to Version 8.0, the parameters will not be editable with the double click pop-up dialog.
For summers compatible with versions prior to version 8.0, see the parts selector entry:
These obsolete summer symbols use the same electrical model but with a different symbol and editing dialog.
Symbols placed on schematics in previous versions of SIMetrix/SIMPLIS can be automatically migrated to use the new symbols. The schematic tools menu Tools > Migrate Schematic Symbols to Version 8.00 will invoke a routine which migrates the existing symbols to the new symbols. As this action makes substantial changes to the schematic, it is recommended that you save a backup copy of the schematic first.
To configure the Summer, follow these steps:
|Gain for input #1||V/V||The gain of the first input. The gain can be negative to implement the difference of two input signals.|
|Gain for input #2||V/V||The gain of the second input. The gain can be negative to implement the difference of two input signals.|
|Annotate pin?||If Checked the pin will be annotated with the Annotation text.|
|Annotation||The text describing this input|
|Input resistance||Ω||The input resistance for all inputs|
|Output offset||V||The output voltage will be offset by this voltage|
One of the new features added to the summers is the ability to add text annotation to the input pins. This annotation is purely for descriptive purposes and is not used in the electrical model. A simple example is a 2-input summer used to produce the difference between two signals. Adding "+" and "-" annotations to the pins will make the schematic easier to read.
The test circuit used to generate the waveform examples in the next section can be downloaded here: simplis_075_simplis_summers.sxsch.
This example adds a high frequency oscillator sawtooth waveform to a slow moving ramp voltage. The sawtooth signal is red, the slow moving ramp is blue and the output is green.