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[moved] tried simulating particular circuit in Hspice and MATLAB Simulink ?

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Anusuya Nallathambi

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I tried to simulate a phase locked loop circuit in Hspice and then in MATLAB. When I simulated the PLL, designed in Hspice, in Simulink, I copied the parameters such as lpf transfer function, vco input sensitivity, vco quiscent frequency of the Hspice circuits onto the blocks in Simulink. Yet the capture range was very different from what I got from Hspice simulation. Does anyone know why this happens ?

Please help.
 

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