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Digital Electronics
NUMBER SYSTEM
BINARY CODES
BOOLEAN ALGEBRA
K MAPS
COMBINATIONAL CKT
INTRODUCTION
ADDER
FULL ADDER(FA)
FA using HAs
BINARY ADDER
SERIAL ADDER
PARALLEL ADDER
CARRY LOOK AHEAD ADDER (CLA)
QUESTION (BCD to Excess-3 using ADDER)
SUBTRACTORS
FULL SUBTRACTOR
FS using HSs
MORE QUESTIONS
SEQUENTIAL CIRCUITS
TIMING CIRCUITS

Encoder:

This digital circuit does exact opposite of the function of a decoder. It converts the information from 2 n to n lines. The truth table is:

We can easily design the circuit diagram from this table. How ever if mistakenly we have ‘1’ at two of the inputs then we’ll have wrong answer from the circuit. But the encoders which come in the form of ICs are priority encoders. These encoders establish a priority to make sure that only highest input is encoded in case of two or more inputs. So if we have 1s at input line 2 and 5, then we’ll have output as 101 as encoder would accept highest input which is 5.

 

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