ywguo
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Hi jmw2011,
While Sheldon's testbench need to be changed a little to bias MOSFET, it is correct to calculate the current gain (id/ig) for measuring ft. Please note that ig is small signal current here. Please refer to Gray's book for details.
Analysis and Design of Integrated Circuits by Gray, Hurst, Lewis, and Meyer, 4th ed., pp. 55 - 58.
Best Regards, Yawei
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