Q11 Figure Q11 shows an amplifier circuit, where the BJT Qı has the following parameters Is = 10-15 A, B = 100, VA = 100 V. The two MOSFETS, M, and M2, are identical and
have the following parameters: VTHP=-1 V, 1= 0, K = 0.5 mAV-2.
V = 10 V
Vi = 5V
M
M2
Ri
35 kΩ
RREF
RS
WH
100 Ω
Rour
Vs
Vo
Rin
R
100 S2
R
V
Fig. 211
BJT Q1 is known to operate in forward active mode.
(a) Determine the value of RREF to provide a de collector current of 1 mA to BJT Qı
(6 marks)
(6) Determine the value of R2.
(2 marks)
(c) Identify the amplifier configuration,
(1 mark)
(d) Determine the small-signal model parameters of Q1, i. e., gm.91, rap, and ro. pl
(3 marks)
(e) Determine Rin and Rour of the two-port network of the amplifier
(4 marks)
(f) Determine the gain ve/vs of the amplifier
(2 marks)
(g) If the supply voltage V, is reduced to 4 V, discuss the effects on the amplifier circuit
Assume no other changes in the amplifier circuit.
(2 marks)