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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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  • ShawnLogan

    Dear jdp721,

     

    Q 1. Parameters AC magnitude and AC phase are only effective in an AC analysis. AC phase does not change the phase of vsin in a transient analysis - at least it does not in IC6.1. There is a parameter "Initial phase for sinusoid" than can be set to a non-zero value to set the phase of the source in a transient analysis. "DC voltage" sets the DC value of vsin in a DC operating point analysis or AV analysis. The vsin parameter "Offset voltage" sets the DC average of the vsin source in a transient analysis.

     Q 2. The DC voltage parameter can be used to set the DC value of the vsin source in a DC operating point analysis. This value can be different than parameter "Offset voltage" which is the average value in a transient analysis.

     

    This is what I observed from running a few test cases in IC6.1 and I hope this is useful.

    Shawn 

     

     

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  • ShawnLogan

    Dear jdp721,

     

    Q 1. Parameters AC magnitude and AC phase are only effective in an AC analysis. AC phase does not change the phase of vsin in a transient analysis - at least it does not in IC6.1. There is a parameter "Initial phase for sinusoid" than can be set to a non-zero value to set the phase of the source in a transient analysis. "DC voltage" sets the DC value of vsin in a DC operating point analysis or AV analysis. The vsin parameter "Offset voltage" sets the DC average of the vsin source in a transient analysis.

     Q 2. The DC voltage parameter can be used to set the DC value of the vsin source in a DC operating point analysis. This value can be different than parameter "Offset voltage" which is the average value in a transient analysis.

     

    This is what I observed from running a few test cases in IC6.1 and I hope this is useful.

    Shawn 

     

     

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