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The magnitude of the voltage source for the Qucs-s power source, available in the components->sources pane puts 0.316228 V as magnitude for a 0 dBm power, 50 Ω (default impedance). The line of the exported netlist is: Since simulators use magnitude for this parameter, which is the peak voltage of the source, this value would be OK for an open circuit, but due the internal impedance only one fourth of a milliwatt is available to the matched load. Shouldn't the voltage be such that when a matched (i.e. 50 Ω) load is fed the power delivered to the load be 0 dBm (1 mW)? |
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Replies: 3 comments 1 reply
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The voltage is measured with a resistive load equal to the source resistance. Qucs/Spice uses the Peak voltage, 1.414 x RMS. I forgot to show the data from ngspice was different than Qucsator...
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See #779 |
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The calculation has been fixed #780 The result from Qucsator and Ngspice are matching now. Thanks for pointing this. |
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Your are welcome! I thank you for quick reply and fixing this! |
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The calculation has been fixed #780 The result from Qucsator and Ngspice are matching now. Thanks for pointing this.