raja.cedt
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dear Ywguo, i think you don't need to calculate exact TF, very hard job for a transistor based problem. Nyquist criterion says
clockwise encirclements= closed loop RHP- openloop RHP. So please plot nyquist plot to check how many encirclements, based on your schematic you may guess open loop RHP, so now you can estimate stability.
Thanks, Raj.
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