A 12- bit ADC is operating with a 1μ sec clock period and total conversion time is seen to be 14μ sec. The ADC must be of the

1.  Flash type

2.  Counting type

3.  Integrating type

4.  Successive approximation type

View Answer  
4
Correct Answer :

Successive approximation type


Explanation :
No Explanation available for this question

Dual slope integration type analog-to-digital convertors provide

1.  Higher speeds compared to all other types of A/D convertors

2.  Very good accuracy without putting extreme requirements on component stability

3.  Poor rejection of power supply hum

4.  Better resolution compared to all other types of A/D converters for the same number of bits.

View Answer  
4
Correct Answer :

Very good accuracy without putting extreme requirements on component stability


Explanation :
No Explanation available for this question

In a 4-bit weighted resistor D/A convertor, the resistor value corresponding to LSB is 32-k ohm. The resistor value corresponding to MSB will be

1.  32k-ohm

2.  16k-ohm

3.  8k-ohm

4.  4k-ohm.

View Answer  
4
Correct Answer :

4k-ohm.


Explanation :
No Explanation available for this question

For a dual ADC type 3 1/2 digit DVM, reference voltage is 100Mv and first integration time is set to 300 ms. For some input volt age, “DE integration” period is 370.2 ms. The DVM will indicate

1.  123.4

2.  199.9

3.  100.0

4.  1.414

View Answer  
4
Correct Answer :

123.4


Explanation :
No Explanation available for this question

A dual-slope analog –to-digital converter uses an N-bit counter. When input signal Va is being integrated, then counter is allowed to count up to a value

1.  Equal to 2N-2

2.  Equal to 2N-1

3.  Proportion to Va

4.  Inversely proportional to Va.

View Answer  
4
Correct Answer :

Inversely proportional to Va.


Explanation :
No Explanation available for this question

The simplified block diagram of a 10-bit A/D convertor of a dual slope integrator type is shown in the given 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 convertor is approximately

1.  2kHz

2.  1kHz

3.  500kHz

4.  250kHz

View Answer  
4
Correct Answer :

1kHz


Explanation :
No Explanation available for this question

What overall accuracy could one reasonably except from construction of a 10 bit A/D converter

1.  0.1%

2.  0.2%

3.  0.3%

4.  0.4%.

View Answer  
4
Correct Answer :

0.2\%


Explanation :
No Explanation available for this question

A 5-bit convertor has a current output for digital input of 10100. If an output current of Ma is produced, what will Iout be for a digital input of 11101

1.  12.5mA

2.  13.5mA

3.  14.5mA

4.  15.5Ma.

View Answer  
4
Correct Answer :

14.5mA


Explanation :
No Explanation available for this question

Circuit of DAC is given below. Switch are closed if input bit is 1, otherwise open If Vref=5V, R= 20k, and RF=10k?, then the scale voltage is

1.  4.6875V

2.  -4.6875V

3.  5V

4.  -5V.

View Answer  
4
Correct Answer :

-4.6875V


Explanation :
No Explanation available for this question

An 8-bit digital –ramp ADC with a 40 resolution uses a clock frequency of 2.5 MHz and a comparator with VT=1mV. The digital output for VA=6.000V is

1.  1 0 0 1 0 1 1 1

2.  1 0 0 1 0 1 1 0

3.  1 0 1 1 1 1 0

4.  1 0 1 1 1 1 1.

View Answer  
4
Correct Answer :

1 0 0 1 0 1 1 1


Explanation :
No Explanation available for this question
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