3. Consider the following circuit with the timing characteristics in the table below. Assume a and b have the timing waveforms shown in Fig. 3 (a changes from O to 1 at t-0, while b is constantly O). Draw the timing waveforms for nodes V1 and V2 of the circuit in the spaces provided in Fig. 3. plh 4 ns Tphl 5 ns 3 ns NOR inverter 2 ns Vi V2 VI 12 t-0 Fig. 3