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7.96 The bias circuit of Fig. 7.48(c) is used in a design with VG = 5 V and RS = 2 k. For a MOSFET with kn = 2 mA/V2, the source voltage was measured and found to be 2 V. What must V t be for this device? If a device for which V t is 0.5 V less is used, what does VS become? What bias current results?