Boolean expressions, data converters and semiconductor memories2

The complement of A+BC :

• A′ + B′C′

• A′B′C′

• A′(B′ + C′)

• (A + B)′(A + C)′

The simplified form of A+A′B:

• AB

• A + B

• A′B′

• A′ + B

The canonical SOP form of Y=A+BC is:

• A + BC

• AB + AC

• A′B′C′ + A′BC + AB′C + ABC

• A′B′C + AB′C′

A 4-bit DAC has a reference voltage of 8 V. The smallest output voltage step is:

• 1 V

• 0.5 V

• 2 V

• 0.533 V

The flash ADC is known for:

• Slow conversion

• Sequential conversion

• Fastest conversion

• Use of one comparator

A Successive Approximation ADC works on:

• Counter principle

• Binary search principle

• Integration method

• Sigma-delta modulation

The access time of memory refers to:

• Time to transfer data

• Time to decode address

• Time to read/write data

• Time to refresh memory

Which memory is non-volatile?

• SRAM

• DRAM

• Flash memory

• Cache memory

A ROM is used for:

• Temporary storage

• Permanent data storage

• Arithmetic operations

• Data transfer

In DRAM, data is stored using:

• Flip-flops

• Capacitors

• Resistors

• Registers