對VCO做PSS+Pnoise時無法打印出頻率對電壓的波形圖

wawafishg

各位好
我在使用virtuoso對VCO做PSS+Pnoise分析時，模擬可以完整跑完，之後點擊Result -> Direct Plot -> Main form -> 選擇PSS harmonic frequency -> 選擇 harmonic=1 -> 按下plot
然而出現以下報錯


ERROR (WIA-1006): Unable to plot expression <harmonic(xval(getData("Vosc+" ?result "pss_fd")) '1)>
           because it does not evaluate to an object that can be plotted, like a waveform or
           parametric wave. See the Visualization & Analysis Tool documentation for information
           about the types of objects that can be plotted in Visualization & Analysis Tool. Only
           the expressions that evaluate to those objects can be plotted.
*Warning* Wave6 is not a waveform object that can be displayed and
          will be DELETED automatically.
          name: "harm=1 freq; pss (Hz)"


並且無法打印出PSS結果
想請問遇到這個問題該如何處理? 謝謝各位