SIMPLIS has a comprehensive built-in library of digital models ranging from primitive gates to high-level macro models, such as a barrel shifter or multiplier. Using these digital models, a wide variety of digital circuits can be simulated. A typical application for these digital models is a digital control loop that controls a switch-mode power converter.
The video below is a demo of this circuit. A hierarchical example can be downloaded here: Digital_PWM.zip.
Regardless of the quantity of digital content, using SIMPLIS digital components is practical for virtual prototyping of mixed-mode analog and digital circuits in power conversion applications.
The SIMPLIS Digital Library provides a variety of digital functions to simplify your simulation efforts. In addition to the basic logic gates that existed in early versions of SIMPLIS, the library now includes the following:
All of the above logic functions in the SIMPLIS digital library have these characteristics:
Simulation speed is improved 10 to 20 times for classic digital gate simulation compared to early versions of SIMPLIS. This improved speed in current SIMPLIS digital simulator allows the simulation of digital circuits to go faster and reduces the numerical complexity of the power supply simulation. For more information, see Maximizing Simulation Speed in Mixed-Mode Simulations.
Additionally, the digital clock frequency can now be much higher than the switching frequency of power supply. This allows SIMPLIS simulation times of power supplies with digital control schemes to be comparable to those with equivalent analog control circuits.
Most devices have the ability to use a Ground Ref pin. A Ground Ref pin is required whenever a digital device is connected to an analog component. For more information, see When is Ground Ref Required?