In the above figure, vl is a square wave, ranging from 0 to VDD at frequency fCLK. In this problem, choose from the following list the largest fCLK value that may be used if the inverter's propagation delay is not to exceed one-eighth of a clock period. 500 MHz 1 GHz 2 GHz 8 GHz 4 GHz MOSFET Parameters: Electrically-matched devices Kn = Kp = 20 μA/V2 VTN = -VTP = 300 mV λn = λp = 0 V-1
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