Response to the following questions:
1. (a) For the circuit in Fig., assume BJTs with high β and vBE =0.7 V at 1 mA. Find the value of R that will result in IO = 10 μA.
(b) For the design in (a), find Ro assuming β = 100 and VA = 40 V.
2. If the pnp transistor in the circuit of Fig. is characterized by its exponential relationship with a scale current IS , show that the dc current I is determined by IR = VT ln(I/IS ). Assume Q1: and Q2: to be matched and Q3:Q4:and Q5: to be matched. Find the value of R that yields a current I = 200 μA. For the BJT, VEB = 0.7 V at IE = 1 mA.
