# Recent questions tagged digital-circuits 1
ECL is the fastest of all logic families. High speed in ECL is possible because transistors are used in difference amplifier configuration, in which they are never driven into ________. Race condition Saturation Delay High impedance
2
The following circuit compares two $2$-bit binary numbers, $X$ and $Y$ represented by $X_1X_0$ and $Y_1Y_0$ respectively. ($X_0$ and $Y_0$ represent Least Significant Bits) Under what conditions $Z$ will be $1$? $X>Y$ $X<Y$ $X=Y$ $X!=Y$
3
The gates G1 & G2 in the figure have propagation delays of 10ns and 20ns respectively. If the input Vi makes an abrupt change from logic 0 to 1 at time t=t0 , then what's the output waveform V0 is ? Also please explain how to handle such kinds of questions of waveform? ​​​​
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Derive a transition table for the asynchronous sequential circuit given in the figure. Determine the sequence of the internal states $y _1Y _2$ for the following sequence of the input $x _1x _2$: 00,10,11,01,11,10,00. ​
6
Show the circuit and the timing diagram for generating six repeated timing signals, $T _0$ through $T _5$.
7
The adder-subtractor circuit of figure has the following values for mode input M and data inputs A and B. In each case, determine the values of the outputs: $S _ 4 S _3 S _2 S _1$ and $C _5$. M A B 0 0111 0110 0 1000 1001 1 0101 1000 1 0000 1010
8
The adder-subtractor of the figure is used to subtract the following unsigned 4-bit number: 0110 – 1001(6 – 9) What are the binary values in the nine inputs of the circuit $?$ what are the binary values of the five outputs of the circuit$?$ Explain How the output is related to the operation of 6 – 9.
1 vote
9
Construct a BCD-to-Excess-3-code converter with a 4-bit adder.remember that the Excess-3 code digits obtained by adding 3 to the corresponding BCD Digit. what must be done to change the circuit to an excess-3-to-BCD-code converter
10
Design a combinational Circuit that converts a 4-bit gray code number to a 4-bit straight binary number. Implement the circuit with Exclusive OR gates.
11
Design a circuit of a three-bit parity generator and the circuit of the four-bit parity checker using an odd parity bit.
1 vote
12
Manipulate the following Boolean Expression in such a way so that it can be implemented using exclusive-OR and AND gates only. $AB’CD’ + A’BCD’ + AB’C’D + A’BC’D$
13
Convert the logic diagram of the code converter shown in the figure to a multilevel NAND gate Circuits
14
Draw the NAND Gate Logic Diagram for each of the following Expressions using multilevel NAND gate Circuits. (AB’ + CD’)E + BC(A + B) w(x + y + z) + xyz
1 vote
15
A BCD to seven segment decoder is a combinational circuit that converts a decimal digit in BCD to an appropriate code for the selection of the segments in the display indicator used for displaying the decimal digit in the familiar form. The seven output of the ... to Seven-segment decoder using the minimum number of the NAND gates. the Six invalid combinations should result in a blank display.
16
Design a combinational Circuit that converts a binary number of 4-bits to decimal number in BCD. Note that the BCD number is the same as the binary number as long as the digit is 9 or less than 9. binary numbers from 1010 to 1111 converts into BCD numbers from 1 0000 to 1 0101.
17
Design a combinational Circuit that can convert a decimal digit from the 2 -4- 2- 1 code to the 8 -4- 2- 1.
18
Design a code converter that converts a decimal digit from 8 -4- 2 -1 code to BCD.
19
Design a combinational circuit that detects an error in the representation of a decimal digit in BCD. The output of the circuit must be equal to logic -1 when the input contains any one of the six unused bit combinations in the BCD code.
20
Design a combinational Circuit with the four inputs and four outputs.The output generates the 2’s complement of the input number.
21
Design a combinational Circuit with four inputs that represent a decimal digit in BCD and the four outputs that Produce the 9’s complement of the input digit. Six unused combinations can be treated as Don’t care conditions.
22
Design a combinational Circuit with four inputs that represent a decimal digit in BCD and the four outputs that Produce the 9’s complement of the input digit. Six unused combinations can be treated as Don’t care conditions.
23
Design a combinational circuit with three inputs and six outputs. The output binary number should be the square of the input binary numbers.
24
Show that a Full-subtractor can be constructed with two half-subtractor and an OR gate.
25
Design a combinational Circuit that multiplies two-bit numbers $a _1a _0$ and $b _1b _0$, to produce a four-bit product, $c _3c _2c _1c _0$. Use AND gates and Half Adders
A combination circuit produces the binary sum of two bits numbers, $x _1x _0$ and $y _1 y _0$. the outputs are C, $S _1$ and $S _0$. Design a combinational Circuit of problem using two full adders.
A combinational circuit produces the binary sum of 2-bit numbers, $x _1x _0 and y _1y _0$. the outputs are C. s1. and s0. Provide the truth table of the combinational circuit
Design a combinational circuit that adds 1 to a 4-bit binary number, $A _3A _2A _1A _0$. For example, if the input of the circuit is, $A _3A _2A _1A _0$ = 1101, the output is 1110, The circuit can be designed using 4 Half Adder.