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How to generate a ramp voltage in Cadence SpectreRF (or AMS)?

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Herang Sayo

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How to generate a ramp voltage in Cadence SpectreRF (or AMS)? I am designing a compartor and need to give a ramp voltage at one of its inputs, the other input being a dc voltage. Can anyone suggest me ideas to generate a ramp voltage.

Thank you.
 

For simulation purpose, use a piecewise linear (PWL) voltage source.
For a real circuit, inject (constant) current into a capacitor and use a reset circuit.
 
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