Exercise: Digital Electronics
Questions for: Digital Electronics
If an analog voltage is expressed in binary using 4 bits, each successive binary count would represent
A: 
of total voltage
of total voltageB: 
of total voltage
of total voltageC: 
of total voltage
of total voltageD: 
of total voltage
of total voltage
Answer: C
Since 1111= decimal 15, each successive binary count represent 1/15 of total voltage.
In the TTL circuit in the figure, S2 to S0 are select lines and X7 to X0 are input lines. S0 and X0 are LSBs. The output Y is
Answer: B
The MUX is made up of TTL circuit. For TTL circuit open terminal is taken high, since S2 select line is connected to OR gate whose one terminal connected to C and the other is open (high) so OR gate output is S2 = 1 + C = 1.
S2 = 1 S1(B) S0(A) Y 1 0 0 0 1 0 1 1 1 1 0 1 1 1 1 0
Y = S0⊕S1 => A⊕B.
A 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000). Then, what will be input, if the output register shows 100111 at the end of conversion.
Answer: A
I/P voltage and reference voltage arc of opposite polarity.
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