Answered: 1.2 RonaC = K. 0.63C TPHL = %3D 0.63C TPLH = 1.2RonpC for Roap K„(Ví + Vrp) and TPLH = K, %3D %3D

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN: 9780133923605

Author: Robert L. Boylestad

Publisher: PEARSON

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Question

What are the new equations [similar to Eqs.)] for τ_PHL and τ _PLH for V_DD = 3.3 V, V_TN = 0.75 V, and V_TP = −0.75 V?

1.2 RonaC =
K.
0.63C
TPHL =
%3D
0.63C
TPLH = 1.2RonpC for Roap
K„(Ví + Vrp)
and TPLH =
K,
%3D
%3D

Expert Solution

Step 1

Given

V_DD = 3.3 V, V_TN = 0.75 V, V_TP =-0.75 V

The ON resistance for NMOS

$R_{o n n} = \frac{1}{K_{n} (V_{D D} - V_{T N})} R_{o n n} = \frac{1}{K_{n} (3.3 V - 0.75 V)} R_{o n n} = \frac{1}{K_{n} (2.55 V)}$

Step 2

Calculating high to low transition

$τ_{P H L} = 2.4 R_{o n n} C τ_{P H L} = 2.4 \times \frac{1}{K_{n} (2.55 V)} \times C τ_{P H L} = \frac{2.4 C}{K_{n} (2.55 V)} τ_{P H L} = \frac{0.94 C}{K_{n}}$

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