( 35 points) The current-mirror circuit shown in Figure 1 utilizes $p n p$ transistors having $I_{S I} =$ $1 0^{? 15} A$ and $I_{S 2} = 4 \times 1 0^{? 15} A$ for transistors $Q_{1}$ and $Q_{2}$ respectively and for both transisturs a $? =$ 100 , and $? V_{A} ? = 20 V$ to source a current at $V_{0}$ . It is required to design the circuit to provide an output current of $I_{O} = 1 mA$ at $V_{O} = 5 V$ . What values of $I_{REF}$ and $R$ are needed? Assume $V_{T} =$ $25 mV$ . Figure 1, Problem 2

Question

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( 35 points) The current-mirror circuit shown in Figure 1 utilizes

p n p

transistors having

I_{S I} =

1 0^{? 15} A

and

I_{S 2} = 4 \times 1 0^{? 15} A

for transistors

Q_{1}

and

Q_{2}

respectively and for both transisturs a

? =

100 , and

? V_{A} ? = 20 V

to source a current at

V_{0}

. It is required to design the circuit to provide an output current of

I_{O} = 1 mA

at

V_{O} = 5 V

. What values of

I_{REF}

and

R

are needed? Assume

V_{T} =

25 mV

. Figure 1, Problem 2

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