Q-Implement a MOD-8 counter using Parallel-in Parallel-out register and Adder. Ans: We have a 3-bit register with two common inputs CLK & CLEAR for all 3 FFs. So we initiate the counter we clear all the FFs and then give clock. Whenever count reaches 7 output of adder becomes 000 with carry 1 and carry is […]

# Tag: questions

## Q7: Maximum Frequency

Q- Find the maximum clock frequency of the following circuit and specifications of the flip-flop are as T (setup) = 5ns T (hold time) = 8ns T (CLK to Q) = 2ns and delay of other components is T (buf) = 2ns, T (AND) = 4 ns, T (OR) = 4 ns, T (NOT) = […]

## Q6: Maximum Frequency

Q- Find the maximum clock frequency of the following circuit and specifications of the flip-flop are as T (setup) = 5ns T (hold time) = 4ns T (CLK to Q) = 9ns and maximum delay of the combinational circuit is T (c-delay) = 13 ns and delay of buffer is T (buf) = 2ns. Delay of […]

## Q5: Maximum Frequency

Q- Find the maximum clock frequency of the following circuit and specifications of the different flip-flop are as T1 (setup) = 5ns T1 (hold time) = 4ns T1 (CLK to Q) = 9ns, T2 (setup) = 4ns T2 (hold time) = 3ns T2 (CLK to Q) = 7ns T3 (setup) = 4ns T3 (hold time) […]

## Q4: Maximum Frequency

Q- Find the maximum clock frequency of the following circuit and specifications of the flip-flop are as T (setup) = 5ns T (hold time) = 4ns T (CLK to Q) = 9ns and delay of other components is T (buf) = 2ns,ï¿½ ï¿½ T (AND) = 4 ns, T (OR) = 4 ns,ï¿½ ï¿½ ï¿½ ï¿½ T (NOT) = […]

## Q3: Binary Multiplier

Q-Implement binary multiplication using shifter: Eg. If we are multiply 11 * 4 Then 11 = 1011 4 = 0100 Algorithm: For multiplication we first multiply the LSB of 4 (multiplier) with multiplicand and then shift it towards right. Then we multiply the next bit and then add it to the shifted result. Again we MULTIPLY, ADD […]

## Q2: Maximum Frequency

Q- Find the maximum clock frequency of the following circuit if specifications of the different flip-flop are as T1 (setup) = 5ns T1 (hold time) = 4ns T1 (CLK to Q) = 9ns, T2 (setup) = 4ns T2 (hold time) = 3ns T2 (CLK to Q) = 7ns T3 (setup) = 4ns T3 (hold time) […]

## Q1: Maximum Frequency

Q- Find the maximum clock frequency of the above circuit if specifications of the flip-flop are as T (setup) = 5ns T (hold time) = 4ns T (CLK to Q) = 9ns and maximum delay of the combinational circuit is T (c-delay) = 13 ns. There is a clock skew of +3ns for 2nd FF in […]

## Q: Design custom ripple counter

Q- Design the ripple counter whose output sequence is represented by the following state diagram. Ans: As we can see that it is a down counter so we’ll be using Q bar of all flip-flops as clock to next flip-flops (negative edged FFs). We draw the table as Q2 Q1 Q0 OUTPUT 0 0 0 0 […]

## Q: Design custom ripple counter

Q- Design the ripple counter whose output sequence is represented by the following state diagram. Ans: As it is a 3-bit counter hence we firstly arrange 3 FFs and now we design the combinational circuit to reset the counter at appropriate point. Q2 Q1 Q0 OUTPUT 0 0 0 0 0 0 1 1 0 1 […]