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The Figure below shows a Wilson current source. Given all the MOSFETs have the following parameters: Vtn = 2 V, kn

The Figure below shows a Wilson current source. Given all the MOSFETs have the following parameters: Vtn = 2 V, kn

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The Figure below shows a Wilson current source. Given all the MOSFETs have the following parameters: Vtn = 2 V, kn

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Figure 3 Figure 3 shows an amplifier with a current mirror as an active load. The MOSFETs have the following parameters: Vtn = −Vt = 0.6 V, kn′ = 200 μA/V2, kp′ = 65 μA/V2, VA(MMOS) = 20 V, VA(PMOS) = −10 V, VT = 26 mV, R1 = 7 kΩ, R2 = 10 kΩ, L = 0.4 μm and W = 4 μm. The base-emitter forward voltage, VBE, of transistor Q4 is 0.7 V. The forward voltage drop for both D1 and D2 is 0.7 V. The supply voltage, VDO = 3 V. Assume the base current of Q4 is negligible compared to the emitter and collector currents of Q4, with all the transistors biased in the active region. a. ) Given that ID = k′(WL)(VGS − Vt)2, calculate the gate to source voltage of Q1. b. ) Calculate the small-signal voltage gain, vout/vin. .

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Figure 3 shows an amplifier with a current mirror as an active load. The MOSFETs have the following parameters: Vtn = −Vtp = 0.6 V, kn′ = 200 μA/V2, kp′ = 65 μA/V2, VA(NMOS) = 20 V, VA(PMOS) = 10 V, VT = 26 mV, R1 = 7 kΩ, R2 = 10 kΩ, L = 0.4 μm and W = 4 μm. The base-emitter forward voltage, VBE, of transistor Q4 is 0.7 V. The forward voltage drop for both D1 and D2 is 0.7 V. The supply voltage, VDD = 3 V. Assume the base current of Q4 is negligible compared to the emitter and collector currents of Q4, with all the transistors biased in the active region. (a) Identify the transistors forming the current mirror. (b) Calculate the value of IREF . (c) Calculate the output resistances of transistors Q1 and Q2.
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Question 3 (25 marks) Figure 4 shows an amplifier with current mirror as active load. The MOSFETs have the following parameters: Vtn = −Vtp = 0.6 V, Kn′ = 200 μA/V2, Kp′ = 65 μA/V2, VA(NMOS) = 20 V, VA(PMOS) = −10 V, L = 0.4 μm and W = 10 μm. The supply voltage, VDD = 3 V and the reference current, IREF is 0.02 mA. Assume all the transistors are biased in the saturation region. Figure 4 (a) Identify the transistors forming the current mirror. [3 marks] (b) Calculate the output resistances of transistors Q1 and Q2. [6 marks] (c) Given that ID = k′(W/L)(VGS − Vt)2, calculate the gate to source voltage of Q1. [7 marks] (d) Calculate the small-signal voltage gain, vout/Vin. [9 marks]
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