# Recent questions tagged digital-electronics

A multiplexer combines four 100-Kps channels using a time slot of 2 bits. a) show the output with for arbitrary inputs b) what is the frame rate? c) what is the frame duration? d) what is the bit rate? e) what is the bit duration?
If some T FFs are connected in series. The 1st FF is supplied by a clock with frequency 1 MHz and the last FF signal out is 31.25 KHz. Find the number of the Flip Flops are used in the circuit.
What would be the asnwer to this question https://gateoverflow.in/26442/gate1991-5-c if FF0 = 10ns FF1 = 20ns FF2 = 30ns AND gate = 10ns
What is the difference between parallel counters and serial counters? Is that parallel counter is synchronous counter and serial counter is asynchronous counter?
1 vote
$Section \space 6.2.2$ is about clocked RS flip flop. My doubt is if we have a NAND based clocked RS flip flop and if inputs $S$ and $R$ are $0$ and $0$ shouldn't this be an invalid state? My thinking is that since it is NAND based RS flip flop which at ... output of 1 and 1 which we know is invalid or forbidden state. So, wouldn't this be applicable if we have a NAND based clocked RS flip flop?
Please explain briefly – how to approach questions like these. Also, few resources where I can learn the concept required to solve such questions. Answer given is – b.
1 vote
Why we are using 2421 code when we have 8421 BCD and XS-3 code already? What is the need of introducing the new system format?
How many addition and substraction are required if you perform multiplication of 5 (multiplcand 1 & -30 multiplier) using Booth Algorithm ?
The gates $G_{1}$ and $G_{2}$ in the figure have the propagation delay of 10 nsec and 20 nsec respectively. If the input $V_{i}$ makes an abrupt change from logic 0 to logic 1 at time t = $t_{0}$ then the output waveform $V_{0}$ is – Answer given is – b. Please explain in detail.
For the given combinational network with three inputs A, B and C, three intermediate outputs P, Q and R, and two final outputs X = P ⋅ Q = ∑(0, 2, 4) and Y = P ⋅ R = ∑(1, 2, 4, 6) as shown below. Find the smallest function P(containing minimum number of min terms that can produce the output x and y) B is the correct answer but how?
Options are A).1.7 B).2.4 C).3.5 D).3.3 Please provide the solution also :)