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Digital Electronics

Digital Electronics
Logic circuits are

 analog circuits
 hybrid circuits
 none of these
 digital circuits

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Digital Electronics
The simplified block diagram of a 10-bit A/D converter of dual slope integrator type is shown in figure. The 10-bit counter at the output is clocked by a 1 Mhz clock. Assuming negligible timing overhead for the control logic, the maximum frequency of the analog signal that can be converted using this A/D converted is approximately .

 500 Hz.
 250 Hz.
  1 KHz.
 2 KHz.

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Digital Electronics
The binary equivalent of hexadecimal number 4F2D is

 0100 1111 0010 1101
 0100 1110 0010 1101
 0101 1111 0010 1100
 0100 1111 0010 1100

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Digital Electronics
Which of the following is 1’s complement representation of +57

 00000001
 11000110
 01000110
 00111001

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Digital Electronics
Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

TTLLS
TTLAS
CMOS
ECL

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Digital Electronics
Which of the following gates is known as a coincidence detector?

 AND gate
 NAND gate
 X-OR gate
 X-NOR gate

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