The purpose of this problem is to illustrate how W/L of the level-restoring transistor
Chapter 15, Problem 15.35(choose chapter or problem)
The purpose of this problem is to illustrate how W/L of the level-restoring transistor QR in the circuit of Fig. 15.19 is determined. For this purpose consider the circuit as specified in 15.34 and let vB = VDD. Now, consider the situation when vA is brought down to 0 V and Q1 conducts and begins to discharge C. The voltage vO1 will begin to drop from VDD. Meanwhile, vO2 is still low and QR is conducting (though at t = 0, the current in QR is zero). Calculate the discharge current at t =0. AsQR conducts, its current subtracts from the current of Q1, reducing the current available to discharge C. Find the value of vO1 at which the inverter begins to switch. This is VIH = 1 8 (5VDD 2Vt). Then, find the current that Q1 conducts at this value of vO1. Choose W/L for QR so that the maximum current it conducts is limited to one-half the value of the current in Q1. What is the W/L you have chosen? Estimate tPHL as the time for vO1 to drop from VDD to VIH .
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