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ADS no DC convergence problem

Question asked by feichen on Jul 20, 2015
Dear all, 
            Now I am simulating a phase shifter. I added antiparallel PIN diode in the bias network, but I could not run the simulation any more due to the DC convergence problem. Attachment(image 1) is my schematic regarding that part.  image2 is from one reference paper. Can any one tell me why?  

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