TopSpice is a comprehensive computer-aided circuit design program that provides advanced native mixed-mode, mixed-signal analog/digital/behavioral simulation. It allows users to simulate circuits with any combination of analog devices, digital functions, and high-level behavioral blocks. With TopSpice, designers can verify and optimize their designs from the system to the transistor level, using the built-in logic simulator for digital sections.
You can check Tina - TI, Window On Top, SpiceOpus and other related programs like PAROC TOP at the "download" section.
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