D14.1 Design the inverter in Fig. 14.12 (a) to provide VOL = 90 mV and

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D14.1 Design the inverter in Fig. 14.12 (a) to provide VOL = 90 mV and to draw a supply current of 30 μA in the low-output state. Let the transistor be specified to have Vt = 0.4 V, μnCox = 125 μA/V2, and λ = 0. The power supply VDD = 1.8 V. Specify the required values of W/L and RD. How much power is drawn from VDD when the switch is open? Closed? Hint: Recall that for small vDS, rDS ≃ 1 /[(μnCox)(W/L)(VGS − Vt)] Ans. 1.9; 57 kΩ; 0; 54 μW (a)

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D14.1 Design the inverter in Fig. 14.12 (a) to provide

V_{O L} = 90 m V

and to draw a supply current of

30 μ A

in the low-output state. Let the transistor be specified to have

V_{t} = 0.4 V, μ_{n} C_{α x} = 125 μ A / V^{2}

, and

λ = 0

. The power supply

V_{D D} = 1.8 V

. Specify the required values of

W / L

and

R_{D}

. How much power is drawn from

V_{D D}

when the switch is open? Closed? Hint: Recall that for small

v_{D S}

,

r_{D S} ≃ 1 / [(μ_{n} C_{o x}) (\frac{W}{L}) (V_{G S} - V_{t})]

Ans.

1.9; 57 k Ω; 0; 54 μ W

(a)

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5.54 The MOSFET in Fig.P5.54 has Vt = 0.4V, kn = 500 μA/V2, and λ = 0. Find the required values of W/L and of R so that when vI = VDD =+1.3V, rDS = 50 and vO = 50mV

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