Andrew Beckett
Senior Fellow
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Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
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No, you don't have to use a port when simulating a Switch Capacitor circuit. You can use a voltage source (vsource) or current source (isource) - whatever is the most appropriate for your needs.
It's a common misperception that SpectreRF analyses require you to use ports; they don't. You need ports for s-parameter analyses, and for measuring noise figure (because these include a noise source as a result of the port impedance). They're also useful if you want to specify a signal level as a power, since they are a voltage source with an in-built resistor, but apart from that you can use any source with any analysis.
Andrew.
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