What is the maximum frequency of this circuit?

[basha_vlsi]

what is the maximum frequency of the circuit given below:

 

[ljxpjpjljx]

Re: maximum frequency

can you declare this problem more chearly?

 

[sp3]

Re: maximum frequency

Hi,

Tha max freq is 91 MHz.

Thanks,
sp3

 

[phoenix_pavan]

Re: maximum frequency

In the ckt C2 is skewed after C1 so

according to eqn

tw>=max tpffD1 + max tcombi + tsuD2 - mint of the gates affecting the clock 2

tw>=max tpffD1 + max tcombi + tsuD2 - mintinverters

tw>= 2ns + (1+1+1+2) + 3ns - (1+1)= 8ns

freq=125 Mhz