In: Electrical Engineering

Explain how the BJTs are used as switches to implement the NAND and
NOR gates respectively.

BJT:

bipolar junction transistor

they can operate in reverse, saturation and active modes depending upon the biasing used

BJT can acts as a switch when the biasing is such that any form on input present at the base can lead to the conduction of current from emitter to collector. In this situation, the BJT will work as a switch.

as we know that Nand gate truth table the output is 0 when both the inputs are 1.

hence the two BJT will be series hence the collector of 1 will be connected to emitter and inputs will be given to the base o the two transistors. as shown the output is taken right after the supply to the first BJT since the output is always 1 until both the transistors are ON.

similarly with nor gates.

the output is 0 even if any 1 of transistors is on hence the transistors should be parallel. the output is taken near the vcc .

as shown:

Why are NAND gates considered to be a universal logic gate? How
are NAND gates utilized?

Implement the following function using a binary decoder and as
few NAND gates as possible.
F= A’B’C’D’ + A’B’C D’ + A’BCD’ +
AB’CD’ + ABC’D’ + ABCD’
a) Draw the truth table for the function.
(8 Pts)
b) Implement the function using only one 74x138
decoder and as few NAND gates as possible. Clearly name all the
signals in accordance with the documentation
standards. (12 Pts)
b) Implement the function using only one 74x138
decoder and as few NAND...

Build AND, OR and NOT gates using NOR gates only. (draw the
circuit and show the Boolean logic behind it - formulae
Prove A' + AB = A + B using Venn diagram (set concepts)
Write ALL the maxterms for a combination of three variables.

Construct a decoder for binary1100 using two input NAND gates
only.

VLSI Question:
Find the estimated rise and fall time of 5-input NOR and
NAND

I need to implement the gates on Logism, please clearly
explain all steps.
Part A: Design and wire a circuit to implement the Boolean
expression S (x, y, z) = ∑m (1, 2, 4, 7) usingan 8-to-1 multiplexer
. Verify the operation by checking all input combinations in the
Boolean function's truth table.
Part B: Implement the function S (x, y, z) from Part A using
only a 4-to-1 multiplexer .You may use NOT gates as needed.
Part C: Implement...

explain different types of switches and scanning and provide
examples of when they can be used
My
major is rehabilitation services. the class is assistuve
technology. the book is assistive technology for people with
disabilities

Use as few 3-input NOR gates as possible to design a bubble
detector circuit for 8-bit thermometer code. An
n-bit thermometer code represents an integer m, with m 1s
followed by (n-m) 0s. 1-bit bubble is an error in
coding when a solitary 0 (or 1) is found in between two 1s (or
0s). What is the size of your circuit in terms of
the number of NOR gates used?
Implement using structural verilog and include a test
bench.

Use as few 3-input NOR gates as possible to design a bubble
detector circuit for 8-bit thermometer code. An
n-bit thermometer code represents an integer m, with m 1s
followed by (n-m) 0s. 1-bit bubble is an error in
coding when a solitary 0 (or 1) is found in between two 1s (or
0s). Implement using structural verilog. Please do not answer
unless familiar with Xilinx and verilog.

2. Design a digital circuit, using a decoder, only Nor gates, a
7-segment display, and D Flip Flops, that repeatedly outputs the
sequences of characters ‘P’, ‘E’, ‘A’, ‘L’ if x=0 and ‘L’, ‘E’,
‘A’, ‘P’ if x=1 .

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