Design the current mirror circuit to provide nominal output current I0

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Design the current mirror circuit to provide nominal output current I0 = 80 μA based on the reference MOS current mirror as shown Figure 1 with VDD = 1.2 V and IREF = 10 μA. Q1 and Q2 have equal channel lengths L = 0.4 μm, equal Vtn = 0.4 V, kn′ = 400 μA/V2, and the width of Q1 is wQ1 = 1 μm. (a) Find the value of R and W2. (12 marks) (b) Assuming Early voltage VA′ = 6 V/μm, find the output resistance of the current source. ( 13 marks) Figure 1

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Design the current mirror circuit to provide nominal output current

I_{0} = 80 μ A

based on the reference MOS current mirror as shown Figure 1 with

V_{D D} = 1.2 V

and

I_{R E F} = 10 μ A . Q_{1}

and

Q_{2}

have equal channel lengths

L = 0.4 μ m

, equal

V_{t n} = 0.4 V, k_{n}^{'} = 400 μ A / V^{2}

, and the width of

Q_{1}

is

w_{Q 1} = 1 μ m

. (a) Find the value of

R

and

W_{2}

. (12 marks) (b) Assuming Early voltage

V_{A}^{'} = 6 V / μ m

, find the output resistance of the current source. ( 13 marks) Figure 1

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