After gaining understanding of the bridge, we can explore how NI Multisim defines various analog and digital models and how this relates to co-simulation results. This article introduces the basic structure of SPICE and XPSPICE-based co-simulation through a detailed explanation of a primitive bridge interface. These tasks include incorporating bridges that translate analog signals to digital and vice-versa. NI Multisim provides an intuitive environment, where the complex tasks required to successfully simulate analog and digital circuitry is automatically accomplished. NI Multisim adds to the versatility of SPICE by incorporating a mixed-mode simulator, allowing fast simulation of both analog and digital components together. Over the years, many enhancements and additions to SPICE have extended its functionality and range of applicability. SPICE simulation is the de facto standard for analog circuit simulation. Circuit simulation is widely regarded as a critical step in the design flow.
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