Ken Kundert
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SpectreRF is a collection of new analysis that are available in Spectre. They are very powerful and very useful. They were originally targeted for RF circuits but their capabilities are general and they have found wide applicability in analog, mixed-signal and even digital circuits.
Perhaps aspect of the RF analyses of SpectreRF that is the most important is that they extend the small-signal analyses (AC and noise primarily) to periodically driven circuits. All of the circuits you mentioned are periodically driven and so benefit from RF analysis. For example, SpectreRFs' PNoise analysis allows you to predict the noise performance of both the components that make up a PLL (oscillator, pfd/cp, divider, etc.) as well as the PLL itself. As another example, people are now using the Pstability analysis to determine whether switch-mode power supplies are stable. If you browse the Analysis section of this website you will find several application notes that describe how to apply SpectreRF to traditional analog and RF circuits.
-Ken
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