使用ADS內建的PLL模組，並且運用在IQ modulation之問題

請問各位高手們
當使用ADS內建的PLL時，該如何實際量測到Fout=OCS*N的輸出頻率呢?
我目前遇到的狀況如下:
VCO_DivideByN這顆元件的freq接腳拉出一條線連接到Specturn，然後在搭配DF與Envelope這兩個模擬元件，並且試著想直接量測到輸出頻率，但問題來了跑出來的結果訊息如下:
Error detected by hpeesofsim during Ptolemy Simulation initialization 'DF'.
output#1 of Cosim '_2_' : Has been resolved to have a timed data type. but the time step has been resolved to 0. At least one device in the graph must set the time step.


我嘗試著去修正，但結果並未改善，在這邊想請問各位高手們可否教教我呢?拜託！

PLL

幫幫我阿！

請問，我要怎麼開啟Spectrum simulation呢?

VCO2.CMP63 , (1 x freq[1]) = 2e+07 Hz is 2e+07 Hz away from the closest analysis frequency at 0 Hz.
The maximum allowed frequency difference is 1.536e+07 Hz.
The spectral component is turned off for this simulation.
In FDD instance VCO2.CMP63 , (1 x freq[2]) = 2e+07 Hz is 2e+07 Hz away from the closest analysis frequency at 0 Hz.
The maximum allowed frequency difference is 1.536e+07 Hz.
This term is ignored and set to 0 for this simulation.

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