The figure below shows a voltage divider bias circuit for an n-channel enhancement mode MOSFET, which has a threshold voltage VT = 0.6 V and K = 2.1 mA/V2. If the source current IS and the drain current ID are both equal to 6 mA, give a value for the gate current IG. Give your answer to the nearest mA.
![Figure P5-1 shows a common source single transistor MOSFET amplifier utilizing an N-Channel Enhancement Mode MOSFET. The term "common source" refers to the source terminal being shared by both the input circuit and the output circuit. The parameters for the MOSFET and the supply voltage are also given. Hand Analysis P1. In terms of DC bias, determine a value for VGS to set the drain current ID to 5 mA. Also determine a value for RD to set the VDS bias to 6 V. P2. In terms of small-signal parameters, determine the transconductance gm of this amplifier as well as the voltage gain, Av. P3. If vgs is a 0.1 Vpk sinewave at a frequency of 1 kHz [ie. vgs = 0.1sin(2pift)V ] determine an expression for the output voltage vOUT as a function of time. Sketch vIN and vOUT for two complete cycles, including the DC bias for each signal. Simulation P4. Simulate the circuit of Figure P5-1 to verify your hand analysis and create a plot similar to P3 as part of your prelab. Use the virtual MOSFET model in simulation with SPICE parameters VT0 = 1.8 V and KP = 120 mA/V2. (The default values of 100um for W and L will be fine since their ratio equals unity.)](https://www.doubtrix.com/js/ckeditor/filemanager/connectors/php/editor/1695874154-Avjhgifoih.png)
![(a) An enhancement n-MOS transistor has the following parameters: Threshold voltage VTh = 0.8 V, K′ = 20 μA/V2 = μnCox, where μn is mobility of electron, Cox gate oxide capacitance. (i) Find W/L ratio for gate voltage VG = 2.8 V, drain voltage, VD = 5 V, source voltage VS = 1 V and drain current ID = 0.24 mA. [6 marks] (ii) Calculate drain current ID for gate voltage VG = 5 V, drain voltage VD = 4 V, source voltage Vs = 2 V [4 marks] (b) For the n-channel EMOSFET used in circuit below, threshold voltage VTh = 1 V, K = 0.3 mA/V2. Find (i) V0 (as shown in figure below) [6 marks] (ii) If V0 = 2 V, find the new K value [4 marks] Fig. 3](https://www.doubtrix.com/uploads/editor/2184158082cIJVKbTciD.png)
