6. The two-resistor bias circuit for this problem employs a drain-to-gate feedback resistor to stabilize the MOSFET bias point. Assume Kn = 250μA/V², VTN = 1V. Find the operating point (ID, VDS). a. Now assume that K₁ decreases by 20% to 200μA/V2, what is the effect on the operating point (IDS, VDS)? RG 2MS2 RD G D S 10kΩ + VDD = 3.3V

Hand Calculation: Since you now have the values of R1 and R2 resistors, obtain numeric value of voltage gain Av=Vo/Vi, and numerical values of input and output resistances Ri and Ro. Note that you need to DC analysis first. Do a hand calculation and calculate the DC collector current or IC. This is needed in order to calculate the small signal parameters gm and rπ and in turn to obtain the Av , Ri and Ro Hence, first perform a DC analysis (use the circuit in Figure 1 and take all capacitors open) and assume your transistor has a β=140.

Figure 6 shows a circuit where feedback is provided between the drain and gate of the transistor M1 Q6 Draw the small signal equivalent circuit of the open loop circuit obtained by breaking the loop at the gate of transistor M1 (suitable for the analysis in the mid band frequency range). Consider Cg as short circuit in the model and state any assumption. (a) (b) State the necessary conditions for the oscillation to occur in the circuit. Using the conditions from (b), derive an expression for the amplifier oscillation frequency fo. (c) Derive the necessary condition for the oscillation to occur in the circuit and state if you can conclude that the circuit will oscillate when considering the values of the inductances L2 = 8 LI = 2 mH; capacitors C = 2 nF; transconductance of the transistor gml = 1.4 mS; and resistors R1 = R2 = Rs : 10 k2. (d) %3D L2 L, R, Cg. C Vout Cp M1 R2 CG Rs Cs Vss = 0 V Figure 6

For the given Common Emitter NPN Amplifier, the transistor made of Germanium diodes, BDC-80, Vcc Rc-3.9 K2, RE-0.68 KQ. a) Name the type of biasing used in the above circuit? 1 = 16 volts, R= 62 KQ, Rz 9.1 K R, Rc Cs b) Find VE? Find VCE? d) Find Vc? e) What is the name of the capacitors C1, C3 and C2?