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Help with complete understanding of "vsin" source in Cadence

jdp721
Hi.

I kind of thoroughly Googled before posting this question for seeking help from you guys! 

The "vsin" source (in analogLib) of Cadence has many parameters: 

i) AC magnitude, AC phase, DC voltage
ii) Offset voltage, Amplitude, Frequency,...

Question 1: Internet resources are indicating that parameters in (i) are for AC analysis, while that in (ii) are for Transient analysis - IS THIS TRUE? - because, I have seen in Cadence that changing the "AC phase" led to change in the Transient output waveform - is it so that the "AC phase" field is common between AC and Tran analyses?

Question 2: what is the use of the "DC voltage" in (i) above? - because, I am seeing that people are setting this to '0 V' most of the times without any explanation!
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  • Tawna

    Yes, they do.  Not all properties on an analogLib component (e.g. vsin, vsource, isource, port, etc.) are supported by all simulators.

    In fact, I recommend using vsource with sourcetype=sine instead of vsin if you are simulating with Spectre.  vsin is a subset of vsource.  New features are put into vsource. vsource has a much more intuitive GUI. 

    Similarly, if using spectre, I recommend port (instead of psin).  All of the port properties are documented in the SpectreRF User Guide (version 13.1 and 13.1.1).  Many of the port properties are the same as the vsource properties.

     best regards,

    Tawna

    best regards,

    Tawna

Reply
  • Tawna

    Yes, they do.  Not all properties on an analogLib component (e.g. vsin, vsource, isource, port, etc.) are supported by all simulators.

    In fact, I recommend using vsource with sourcetype=sine instead of vsin if you are simulating with Spectre.  vsin is a subset of vsource.  New features are put into vsource. vsource has a much more intuitive GUI. 

    Similarly, if using spectre, I recommend port (instead of psin).  All of the port properties are documented in the SpectreRF User Guide (version 13.1 and 13.1.1).  Many of the port properties are the same as the vsource properties.

     best regards,

    Tawna

    best regards,

    Tawna

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