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Constant Power Source

ssarkar

Hi,

I have searched extensively for this problem but was unable to get a related post.

Suppose I have a diode-connected mosfet connected on the drain side by a constant power source (port cell in analogLib of Virtuoso); and on the source side to a capacitor and a current-source load, like a half-wave rectifier. The constant power source ("port" cell in analogLib) takes the value of source resistance, source type (sine), source frequency, and power amplitude of the source (in dBm).

I wanted to model the whole system, which is not achievable until I know how the voltage and current behaves at the output of the constant power source. The presence of a MOSFET makes it more non-linear. It would be of great help if someone can help me with this.

Thanks in advance,

Regards,

Soumik

Parents
  • ssarkar

    Thanks for the reply. This is really helpful, especially the "help" command. The misconceptions that got cleared:

    1) I was trying to think of the port as an antenna, and hence assumed that I am receiving the specified power at the input. According to your reply, the power that we specify in the "port" parameters only determines the voltage at the source depending on the source resistor.

    2) Initially, I thought the amplitude that I specify inside the "port" parameters is that of the internal source. According to your reply, this is the amplitude at the output during perfect matching. So I think I should calculate the source amplitude using the formula, and then consider it as fixed. Now the current should in turn depend on the load. (Earlier I was forcing the condition in my model that (voltage*current) should be equal to the input power)

    I haven't read the documentation yet, but this is what I understood from your reply.

    Thanks again,

    Regards,

    Soumik.

Reply
  • ssarkar

    Thanks for the reply. This is really helpful, especially the "help" command. The misconceptions that got cleared:

    1) I was trying to think of the port as an antenna, and hence assumed that I am receiving the specified power at the input. According to your reply, the power that we specify in the "port" parameters only determines the voltage at the source depending on the source resistor.

    2) Initially, I thought the amplitude that I specify inside the "port" parameters is that of the internal source. According to your reply, this is the amplitude at the output during perfect matching. So I think I should calculate the source amplitude using the formula, and then consider it as fixed. Now the current should in turn depend on the load. (Earlier I was forcing the condition in my model that (voltage*current) should be equal to the input power)

    I haven't read the documentation yet, but this is what I understood from your reply.

    Thanks again,

    Regards,

    Soumik.

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