Solution for CMOS Digital Integrated Circuits Analysis and Design 3RD Edition Chapter 10, Problem 1

by Sung-Mo, Kang and Yusuf Leblebici
77 Solutions 13 Chapters 24438 Studied ISBN: 9780072460537 5 (1)

Chapter 10, Problem Exercise_Problems 1 : 10.1 Consider the DRAM circuit shown in Fig....

10.1 Consider the DRAM circuit shown in Fig. P10.1a. The threshold voltage of the two precharge transistors is 0.53V. Calculate the steady-state voltages of VD in region and region of Fig.P10.1b by assuming the following:

C=10fF

CD=80fF

V(C)=V(C/2)=VY=0V in region

while PC is high, no other transistor connected to D or D_bar is on.

Figure P10.1b

Step-By-Step Solution

10.1 Consider the DRAM circuit shown in Fig. P10.1a. The threshold voltage of the two precharge transistors is 0.53V. Calculate the steady-state voltages of VD in region and region of Fig.P10.1b by assuming the following:

C=10fF

CD=80fF

V(C)=V(C/2)=VY=0V in region

while PC is high, no other transistor connected to D or D_bar is on.

Figure P10.1b

(Solution)

At steady state, there is no current flow through the precharging transistors.

Therefore, in Region :

In Region , charge sharing occurs,